Showing posts with label simple. Show all posts
Showing posts with label simple. Show all posts
Friday, October 17, 2014
Simple Park Aid Circuit Diagram
This Park-Aid Circuit Diagram was designed as an aid in parking the car near the garage wall when backing up. LED D7 illuminates when bumper-wall distance is about 20 cm., D7+D6 illuminate at about 10 cm. and D7+D6+D5 at about 6 cm. In this manner you are alerted when approaching too close to the wall. All distances mentioned before can vary, depending on infra-red transmitting and receiving LEDs used and are mostly affected by the color of the reflecting surface.
Black surfaces lower greatly the device sensitivity. Obviously, you can use this circuit in other applications like liquids level detection, proximity devices etc. Circuit operation: IC1 forms an oscillator driving the infra-red LED by means of 0.8mSec. pulses at 120Hz frequency and about 300mA peak current. D1 & D2 are placed facing the car on the same line, a couple of centimeters apart, on a short breadboard strip fastened to the wall. D2 picks-up the infra-red beam generated by D1 and reflected by the surface placed in front of it. The signal is amplified by IC2A and peak detected by D4 & C4. Diode D3, with R5 & R6, compensates for the forward diode drop of D4. A DC voltage proportional to the distance of the reflecting object and D1 & D2 feeds the inverting inputs of three voltage comparators. These comparators switch on and off the LEDs, referring to voltages at their non-inverting inputs set by the voltage divider resistor chain R7-R10.
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Black surfaces lower greatly the device sensitivity. Obviously, you can use this circuit in other applications like liquids level detection, proximity devices etc. Circuit operation: IC1 forms an oscillator driving the infra-red LED by means of 0.8mSec. pulses at 120Hz frequency and about 300mA peak current. D1 & D2 are placed facing the car on the same line, a couple of centimeters apart, on a short breadboard strip fastened to the wall. D2 picks-up the infra-red beam generated by D1 and reflected by the surface placed in front of it. The signal is amplified by IC2A and peak detected by D4 & C4. Diode D3, with R5 & R6, compensates for the forward diode drop of D4. A DC voltage proportional to the distance of the reflecting object and D1 & D2 feeds the inverting inputs of three voltage comparators. These comparators switch on and off the LEDs, referring to voltages at their non-inverting inputs set by the voltage divider resistor chain R7-R10.
Park-Aid Circuit Diagram
![Park-Aid]()
Parts:
R1_____________10K 1/4W Resistor
R2,R5,R6,R9_____1K 1/4W Resistors
R3_____________33R 1/4W Resistor
R4,R11__________1M 1/4W Resistors
R7______________4K7 1/4W Resistor
R8______________1K5 1/4W Resistor
R10,R12-R14_____1K 1/4W Resistors
C1,C4___________1µF 63V Electrolytic or Polyester Capacitors
C2_____________47pF 63V Ceramic Capacitor
C3,C5_________100µF 25V Electrolytic Capacitors
D1_____________Infra-red LED
D2_____________Infra-red Photo Diode (see Notes)
D3,D4________1N4148 75V 150mA Diodes
D5-7___________LEDs (Any color and size)
IC1_____________555 Timer IC
IC2___________LM324 Low Power Quad Op-amp
IC3____________7812 12V 1A Positive voltage regulator IC
Circuit modification:
A circuit modification featuring an audible alert instead of the visual one is available here: Park-Aid Modification
Notes:
- Power supply must be regulated (hence the use of IC3) for precise reference voltages. The circuit can be fed by a commercial wall plug-in adapter, having a DC output voltage in the range 12-24V.
- Current drawing: LEDs off 40mA; all LEDs on 60mA @ 12V DC supply.
- The infra-red Photo Diode D2, should be of the type incorporating an optical sunlight filter: these components appear in black plastic cases. Some of them resemble TO92 transistors: in this case, please note that the sensitive surface is the curved, not the flat one.
- Avoid sun or artificial light hitting directly D1 & D2.
- If your car has black bumpers, you can line-up the infra-red diodes with the (mostly white) license or number plate.
- It is wiser to place all the circuitry near the infra-red LEDs in a small box. The 3 signaling LEDs can be placed far from the main box at an height making them well visible by the car driver.
- The best setup is obtained bringing D2 nearer to D1 (without a reflecting object) until D5 illuminates; then moving it a bit until D5 is clearly off. Usually D1-D2 optimum distance lies in the range 1.5-3 cm.
- If you are needing a simpler circuit of this kind driving a LED or a relay, click Infra-red Level Detectorv
Thursday, October 16, 2014
Simple Car Alarm Arming Horn Beep Canceller
Its a great convenience that most modern cars come with a built in alarm, however it is nothing but noise pollution that the horn sounds when the alarm is armed. Disconnecting the alarm system from the horn relay will eliminate this, but prevent the horn from sounding in the even of an actual alarm. This circuit serves to silence the arming beep yet maintain the alarm by introducing a small delay into the signal. It sits between the alarm and horn relay. The alarm must provide a constant horn signal for at least 3 seconds before the horn relay is activated. That way the quick "beep" will never activate the horn relay, while the constant alarm signal will.
| C1 | 1 | 0.01uF Ceramic Disc Capacitor | |
| C2 | 1 | 100uF 35V Electrolytic Capacitor | |
| R1 | 1 | 1K 1/4W Resistor | |
| R2 | 1 | 10K 1/4W Resistor | |
| R3 | 1 | 15K 1/4W Resistor | |
| R4 | 1 | 470 Ohm 1/4W Resistor | |
| D1, D3, D4 | 3 | 1N4004 Rectifier Diode | |
| D2 | 1 | Red LED | |
| U1 | 1 | 555 Timer IC | |
| K1 | 1 | SPST 12V Automotive Relay | |
| MISC | 1 | Board, Wire, Socket For U1, Case |
Simple 0 50V 2A Bench Power Supply Circuit Diagram
I use the lm10 IC because it has a reference voltage and that’s useful for dc power supply. With two ICs can take different output voltage and amperage. This circuit is protected from short circuit.P2 is for controlling the current at the range of 0-2A. Stabilize the output voltage with R4 on negative pin on op-amp and with R2 & P1 on positive pin.
0-50V 2A Bench Power Supply Circuit Diagram
Op-amp output controls T1 that not let ripple of voltage.T1 increase or decrease ampere of R6 and control the voltage of T5 & T4. Pin 1 is the reference voltage and reference voltage is losing some voltage on R1 that has 100uA . This current passes through P1 too.
Vlose p1=100uA*Rp1
Vlose p1=100uA*Rp1
This lose voltage regulate output voltage rate of output current is compare between reference voltage of P3 and lose voltage on R11.T3 is protecting short circuit with R11. For reduce out put voltage to 0v should parallel one resistor 470 ohm in out put. Minimum voltage is 0.4v. The maximum output voltage is fixed with R1b and should not become over of 50v. Therefore your transformer should give 36V, 3A with 4700uF capacitor. T6, T5, T7 need heatsilk.
R1a = 2,2 K
R1b = read the text
R2 = 10 K
R3, R7 = 3.3 k
R4 = 390 Ohm
R5 = 47 K
R6 = 3.3 K 1Watt
R8 = 180 Ohm
R9, R10 = 0.47 Ohm 3Watt
R11 = 0.075 Ohm 2Watt
R12 = 470 Ohm
P1 = 500K liner potentiometer
P2 = 4.7 K potentiometer
P3 = 10 K potentiometer
C1 = 1nF
C2 = 10nF
C3 = 22nF
C4 = 47mF 63v electrolytic
C5 = 4700mF 80v electrolytic
T1, T2 = BC161
T3, T4 = BD141
T5 = BD241
T6, T7 = 2V3055
D1, D2 = 1N4148
D3, D4 = 1N4001
IC1, IC2 = LM10C
R1b = read the text
R2 = 10 K
R3, R7 = 3.3 k
R4 = 390 Ohm
R5 = 47 K
R6 = 3.3 K 1Watt
R8 = 180 Ohm
R9, R10 = 0.47 Ohm 3Watt
R11 = 0.075 Ohm 2Watt
R12 = 470 Ohm
P1 = 500K liner potentiometer
P2 = 4.7 K potentiometer
P3 = 10 K potentiometer
C1 = 1nF
C2 = 10nF
C3 = 22nF
C4 = 47mF 63v electrolytic
C5 = 4700mF 80v electrolytic
T1, T2 = BC161
T3, T4 = BD141
T5 = BD241
T6, T7 = 2V3055
D1, D2 = 1N4148
D3, D4 = 1N4001
IC1, IC2 = LM10C
Wednesday, October 15, 2014
Simple Frequency Voltage Converter Circuit Diagram
This is the simple frequency voltage converter circuit diagram. Teledyne Semiconductor`s Type TSC9402 is a versatile IC. Not only can it convert voltage into frequency, but also frequency into voltage. It is thus eminently suitable for use in an add-on unit for measuring frequencies with a multimeter.
Only a few additional components are required for this.. Just one calibration point sets the center of the measuring range (or of that part of the range that is used most frequently). The frequency-proportional direct voltage at the output (pin 12—amp out) contains interference pulses at levels up to 0.7 V. If these have an adverse effect on the multimeter, they can be suppressed with the aid of a simple RC network.
The output voltage, U0, is calculated by: tfo=C/rei(Ci + 12 pF) R2fm Because the internal capacitance often has a greater value than the 12 pF taken here, the formula does not yield an absolute value. The circuit has a frequency range of dc to 10 kHz. At 10 kHz, the formula gives a value of 3.4 V. The circuit draws a current of not more than 1 mA.
Frequency Voltage Converter Circuit Diagram
Wednesday, September 24, 2014
Simple Schmitt Trigger Circuits
By replacing the common-emitter resistor in a conventional Schmitt by a zener diode,the hysteresis normally associated with these circuits is eliminated.
One cheap IC, ul.914, can be used as an extremely simple and effective Schmitt trigger suitable for many applications. Hysterisis of the circuit is about 0.1 Volt. This may be varied by altering the values of R1 and R2.
An LED and phototransistor optical coupler system may be used to lengthen a three microsecond pulse to 55 milliseconds by using the values shown in the diagram. This allows complete isolation between input pulse circuits and the lengthener to be obtained.
One cheap IC, ul.914, can be used as an extremely simple and effective Schmitt trigger suitable for many applications. Hysterisis of the circuit is about 0.1 Volt. This may be varied by altering the values of R1 and R2.
An LED and phototransistor optical coupler system may be used to lengthen a three microsecond pulse to 55 milliseconds by using the values shown in the diagram. This allows complete isolation between input pulse circuits and the lengthener to be obtained.
Simple Baud Rate Generator Circuit IC 4060 Output Pin Out Configurations
The generator described is a good value·for money alternative to the commercially available types; it uses only one CMOS-IC 4060 and provides up to seven different baud rates. Lets learn more regarding the pin out configuration of the IC 4060.
Each serial data interface requires a baud rate generator: terminal, printer tape interface. . . lt is often not possible to use the same generator for input and output, so it would be useful to add one to, for instance, the UART in the computer or the UART in the terminal. To keep the ,costs of such an addition down, we have developed a generator which uses just one IC, two resistors, one preset potentiometer and a capacitor. The CMOS 4060 is a 14-stage binary counter with an internal oscillator which only requires the frequency determining RC components. As the reset is connected to earth, the counter begins to count upwards when the supply is switched on. A clock frequency then becomes available at the outputs: the higher the number of the output, the lower the frequency available at it.
In the circuit shown the frequencies avail- able at the various outputs are: O4 = 9600 baud 08 = 600 baud 05 = 4800 baud O9 = 300 baud O6 = 2400 baud Q10 = 150 baud Q7 = 1200 baud If the outputs are wired as shown in the circuit diagram, the required baud rate can then be selected by means of a wire link. _ The oscillator frequency can be set precisely with P1, and measured either at pin 9 of the 4060 or at one of the outputs O4 . . . Q10. With the values shown, the frequency at pin 9 should be 38.4 kl-lz; at the outputs O4. . .010 the relevant baud rate. lt is often required that the clock frequency is 16 times the baud rate (for instance, with asynchronous ~ operation of the 6850, 8251, 280- SIO. . .). ln that case, C1 must be replaced by a 27 nF capacitor and the oscillator frequency must be set to 614.4 kHz.
Each serial data interface requires a baud rate generator: terminal, printer tape interface. . . lt is often not possible to use the same generator for input and output, so it would be useful to add one to, for instance, the UART in the computer or the UART in the terminal. To keep the ,costs of such an addition down, we have developed a generator which uses just one IC, two resistors, one preset potentiometer and a capacitor. The CMOS 4060 is a 14-stage binary counter with an internal oscillator which only requires the frequency determining RC components. As the reset is connected to earth, the counter begins to count upwards when the supply is switched on. A clock frequency then becomes available at the outputs: the higher the number of the output, the lower the frequency available at it.
In the circuit shown the frequencies avail- able at the various outputs are: O4 = 9600 baud 08 = 600 baud 05 = 4800 baud O9 = 300 baud O6 = 2400 baud Q10 = 150 baud Q7 = 1200 baud If the outputs are wired as shown in the circuit diagram, the required baud rate can then be selected by means of a wire link. _ The oscillator frequency can be set precisely with P1, and measured either at pin 9 of the 4060 or at one of the outputs O4 . . . Q10. With the values shown, the frequency at pin 9 should be 38.4 kl-lz; at the outputs O4. . .010 the relevant baud rate. lt is often required that the clock frequency is 16 times the baud rate (for instance, with asynchronous ~ operation of the 6850, 8251, 280- SIO. . .). ln that case, C1 must be replaced by a 27 nF capacitor and the oscillator frequency must be set to 614.4 kHz.
Friday, September 19, 2014
Simple 4 Channel Video Amplifier using NJM2582
A very simple 4 channel video amplifier electronic circuit project can be designed using NJM2582 ic suitable for video applications with SCART connector . Design of the circuit is very simple and require few external electronic parts .
Circuit diagram :
Simple 4 Channel Video Amplifier Circuit Diagram
Some features of the NJM2582 are : Operating Voltage ±5V, +5V, +11V ; 6input 4output , 2input 1output Video SW , Internal LPF , 6dB Amplifier , Internal 75Ω Driver Circuit , DC output for SCART (FUNCTION SW, BLANKING) .
Monday, September 8, 2014
Simple Tactful Triac Controller Wiring diagram Schematic
Simple Tactful Triac Controller Circuit Diagram. This is the sensitive triac schema in this schema the single transistor connected between the capacitor and the common side of the ac line allows a logic-level signal to control this triac power schema. Resistor R2 prevents false triggering of the triac by the trickle current through the diac.
Simple Tactful Triac Controller Circuit Diagram
Sunday, September 7, 2014
Simple Light Dependent Resistors
LDRs or lightweight Dependent Resistors are terribly helpful particularly in light/dark sensor diagram. Normally the resistance of an LDR is incredibly high, typically as high as a thousand 000 ohms, however once they are illuminated with lightweight resistance drops dramatically.
The animation opposite shows that when the torch is turned on, the resistance of the LDR falls, permitting current to have it.Circuit Wizard software has been used to show, the vary of values of a ORP12, LDR .
When a light-weight level of a thousand lux (bright light) is directed towards it, the resistance is 400R (ohms).
When a light-weight level of ten lux (very low light level) is directed towards it, the resistance has risen dramatically to ten.43M (10430000 ohms).
This is an example of a light-weight sensor schema :
When the sunshine level is low the resistance of the LDR is high. This prevents current from flowing to the bottom of the transistors. Consequently the LED doesnt lightweight. However, when lightweight shines onto the LDR its resistance falls and current flows into the bottom of the primary transistor and then the second transistor. The LED lights.
The preset resistor will be turned up or right down to increase or decrease resistance, during this means it will build the schema additional or less sensitive. Link
When the sunshine level is low the resistance of the LDR is high. This prevents current from flowing to the bottom of the transistors. Consequently the LED doesnt lightweight. However, when lightweight shines onto the LDR its resistance falls and current flows into the bottom of the primary transistor and then the second transistor. The LED lights.
The preset resistor will be turned up or right down to increase or decrease resistance, during this means it will build the schema additional or less sensitive. Link
Saturday, September 6, 2014
Simple Low Power Car Stereo Amplifier
A simple low power car stereo amplifier schema based on TDA 2003 is shown here. The schema uses cheap, readily available components and it is very easy to construct. TDA2003 is an integrated car radio amplifier from ST Micro electronics that has a lot of good features like short schema protection for all pins, thermal over range low harmonic distortion, low cross over distortion etc.
Circuit diagram :
A simple low power car stereo amplifier Circuit Diagram
In the schema given here each TDA2003 is wired as a mono amplifier operating from a 12V supply. Resistors R2 and R3 forms a feedback network that sets the amplifiers gain. C7 is the input DC de-coupling capacitor and C5 couples the speaker to the amplifiers output. C4 is used for improving the ripple rejection while C1 and C2 are employed for power supply filtering. C3 and R1 are used for setting the upper frequency cut-off. Network comprising of C6 and R4 is used for frequency stabilization and to prevent oscillation.
Notes.
- Assemble the schema on a good quality PCB.
- Heat sinks are necessary for both ICs.
- The schema can be operated from 12V DC.
- S1 is the ON/OFF switch
Friday, September 5, 2014
Simple 555 Tester Wiring diagram Schematic
This is a Simple 555 Tester Circuit Diagram. The IC 555 is a widely used timers, control diagram, PWM, alarms, etc.. Often we set up a schema that does not work or works differently than expected, this time the ideal is a test schema for this IC.
This test schema 555 is connected as an astable multivibrator when the button switch S1 is pressed, the LEDs D1 and D2 flash alternately. Ie, when the output is high D2 will light when the output is low D3 will light, and the other a Hi Lo. The speed of flashes is determined by the components R1, R2 and C1.Pressing the S1 test the 555 starts and any change in the IC flashes may consider to be defective.
Simple Meter Impedance speaker Wiring diagram Schematic
A simple impedance meter can be useful to measure the actual impedance of a speaker or headset, ideal for anyone working with sound, making and repairing speakers. This impedance meter works in conjunction with a multimeter or oscilloscope to measure the impedance.
Simple Meter Impedance speaker Circuit Diagram
How to make the measurement of impedance speaker with the multimeter
Connect a digital multimeter to AC voltage in the range of 200mV.
Connect the device under test terminals
SW1 to R7, if the value of the measured impedance is less than 100 ohm R8 or upwards.
With SW2 in the "Set" power-on schema through SW3
Adjust P1 to read exactly 100.0mV the display DVM
Switch SW2 in the "Measure" and read directly from the speaker or headphones impedance value on the display DVM, eg 8.2mV = 8.2 Ohm / 80.1mV = 80.1 Ohm
How to make the measurement of impedance speaker with the oscilloscope:
Connect the oscilloscope instead of DVM (multimeter) and turn P1 fully clockwise.
Short the output speaker and adjust R3 to get a sine wave amplitude of about 2.2V peak-to-peak.
How to make the impedance measurement Speaker "By ear"
Connect a small speaker or headphones, forming a pair of headphones to the output of the schema and turn P1 to obtain a level of sound output moderated. Carefully adjust R3 until the output sound stops, then turn the trimpot to adjust slowly and stop immediately when the sound start again.
List of components
P1 4K7 linear potentiometer
R1 12K 1/4W Resistor
R2 2K2 1/4W Resistor
R3 1K 1/2W Trimmer (cermet)
R4 1K5 1/4W Resistor
4K7 1/4W Resistor R5
R6 3K3 1/4W Resistor
R7 100R 1/4W Resistor (See Notes)
R8 1K 1/4W Resistor (See Notes)
R9 1K 1/4W Resistor (Optional)
22NF 63V Polyester Capacitor C1
C2 330nF 63V Polyester Capacitor
C3 22μF 25V Electrolytic Capacitor
D1, D2 1N4148 75V 150mA Diodes
D3 3mm red LED (Optional)
Q1, Q2, Q3 BC550C 45V 100mA Low noise High gain NPN
IC1 78L05 5V 100mA Regulator IC
SW1, SW2 SPDT Toggle or Slider
SW3 SPST switch or Slider
B1 9V PP3 battery for PP3Clip
Notes:
For very precise measurements using resistors R7 and R8 with 1% or 2% tolerance.
D3 LED pilot and his current limiting resistor R9 are optional.
Thursday, September 4, 2014
Simple LCD Module in 4 bit Mode
In many projects use is made of alphanumeric LCDs that are driven internally by Hitachi’s industry-standard HD44780 controller. These displays can be driven either in 4-bit or 8-bit mode. In the first case only the high nibble (D4 to D7) of the display’s data bus is used. The four unused connections still deserve some closer attention. The data lines can be used as either inputs or outputs for the display. It is well known that an unloaded output is fine, but that a floating high-impedance input can cause problems. So what should you do with the four unused data lines when the display is used in 4-bit mode? This question arose when a schema was submitted to us where D0-D3 where tied directly to GND (the same applies if it was to +5 V) to stop the problem of floating inputs.
The LCD module was driven directly by a microcontroller, which was on a development board for testing various programs and I/O functions. There was a switch present for turning off the enable of the display when it wasn’t being used, but this could be forgotten during some experiments. When the R/Wline of the display is permanently tied to GND (data only goes from the microcontroller to the display) then the remaining lines can safely be connected to the supply (+ve or GND). In this application however, the R/Wline was also controlled by the microcontroller. When the display is initialised correctly then nothing much should go wrong. The data sheet for the HD44780 is not very clear as to what happens with the low nibble during initialisation.
The LCD module was driven directly by a microcontroller, which was on a development board for testing various programs and I/O functions. There was a switch present for turning off the enable of the display when it wasn’t being used, but this could be forgotten during some experiments. When the R/Wline of the display is permanently tied to GND (data only goes from the microcontroller to the display) then the remaining lines can safely be connected to the supply (+ve or GND). In this application however, the R/Wline was also controlled by the microcontroller. When the display is initialised correctly then nothing much should go wrong. The data sheet for the HD44780 is not very clear as to what happens with the low nibble during initialisation.
After the power-on reset the display will always be in 8-bit mode. A simple experiment (see the accompanying schema) reveals that it is safer to use pull-down resistors to GND for the four low data lines. The data lines of the display are configured as outputs in this schema (R/Wis high) and the ‘enable’ is toggled (which can still happen, even though it is not the intention to communicate with the display). Note that in practice the RS line will also be driven by an I/O pin, and in our schema the R/W line as well. All data lines become high and it’s not certain if (and if so, for how long) the display can survive with four shorted data lines. The moral of the story is: in 4-bit mode you should always tie D0-D3 via resistors to ground or positive.
Author: L. Lemmens
Copyright: Elektor Electronics
Copyright: Elektor Electronics
Wednesday, September 3, 2014
Simple Toss A Coin Binary Box Wiring diagram Schematic
This is a Simple Toss A Coin Binary Box Circuit Diagram. The entropy of such a process is given by the binary entropy function. This Circuit uses an astable multivibrator to vary the heads-or-tails condition, and a flip-flop to store the condition given by the multivibrator Consequently, the schema is wired so that the flip-flop`s state is changed once for each full cycle the multivibrator goes through to assure an absolutely even 50-50 chance of a heads or tails loss.
Simple Toss A Coin Binary Box Circuit Diagram
Simple Knight Rider lights Circuit for model cars
This simple schema drives 6 LEDs in Knight Rider scanner mode. Power consumption depends mainly on the type of LEDs used if you use a 7555 (555 CMOS version).
![Simple]()
Note
That VDD and GND for the ICs are not shown in the schema drawing.
Simple Knight Rider lights Circuit Diagram
Note
That VDD and GND for the ICs are not shown in the schema drawing.
| Pin-outs: | |||||
| (7)555 | 4017 | ||||
| 1 | GND | 1 | Q5 | 9 | Q8 |
| 2 | TRIGGER | 2 | Q1 | 10 | Q4 |
| 3 | OUTPUT | 3 | Q0 | 11 | Q9 |
| 4 | RESET | 4 | Q2 | 12 | CO |
| 5 | CONTROL VOLTAGE | 5 | Q6 | 13 | NOT ENABLE |
| 6 | THRESHOLD | 6 | Q7 | 14 | CLK |
| 7 | DISCHARGE | 7 | Q3 | 15 | RESET |
| 8 | VDD | 8 | GND | 16 | VDD |
Tuesday, September 2, 2014
Simple Circuit Board Checker
This little schema indicates the basic integrity of a printed board, detecting 0V, positive supply voltage from less than 3V to 30V and floating parts. If the probe is floating, as it would be in a broken track, then both LEDs barely light up, since there is no current to drive the transistors, but if the probe touches 0V or a positive voltage one or other lights. A digital signal should light them in proportion to the mark-space ratio whereas the output of a schema oscillating at a frequency rate below about 20Hz will cause the LEDs to flicker alternatively. The LEDs will illuminate always at a constant intensity, no matter the voltage supply used, because they are fed by a very simple FET constant-current generator (Q1).
Simple Circuit Board Checker Circuit diagram
Circuit Board Checker Circuit Diagram
Parts:
R1 = 22K
R2 = 22K
D1 = Red LED
D2 = Green LED
Q1 = BF245
Q2 = BC547
Q3 = BC557
Notes:
- The Black clip must be connected to the negative ground of the board under test.
- The Red clip should be connected to a positive voltage source (not exceeding 30V) available on the same board.
- Metal probe is suitable for this schema.
- Two Miniature Crocodile Clips (Red and Black) are also necessary.
Monday, September 1, 2014
Simple Battery charger Wiring diagram Schematic
This is a simple Battery charger schema diagram. A diac is used in the gate schema to provide work for the signal being applied to the gate. R1 a threshold level for firing the triac. C3 and R4 is selected to limit the maximum charging cur-provide a transient suppression network Rl, rent at full Totation of R2. R2, R3, Cl, and C2 provide a phase-shift net.
Simple Battery charger Circuit Diagram
Simple Battery charger Circuit Diagram
Saturday, August 30, 2014
LM317 Simple Audio Amplifier Circuits
You most likely know that LM317 IC is applied as an practical provide regulator, but did you know it can be applied as an audio amplifier? This is a Low power Amplifier LM317 Simple Audio Amplifier Circuit a audio designed with LM317 that offers a optimum probable 1W audio strength.
LM317 Simple Audio Amplifier Circuit Diagrams :| LM317 Simple Audio Amplifier Circuits |
Utilization a amazing heatsink for the LM317 IC and modify the 5K various resistor so that you have 4.5V on 10Ω resistor (or LM317 pin 2, Vout).
Simple Switch Mode Voltage Regulator Wiring diagram Schematic
This is a Simple Switch-Mode Voltage Regulator Circuit Diagram. This Simple Switch-Mode Voltage Regulator Circuit Diagram power supplies offer the benefit of a much greater efficiency than obtainable with a traditional power supply. The Simple Switch-Mode Voltage Regulator Circuit Diagram presented here has an efficiency of around 85%. An input voltage of 12 to 16 Vdc is converted into a direct voltage of exactly 5 V.
Simple Switch-Mode Voltage Regulator Circuit Diagram
The use of a MAX638CPA enables the design and construction of the regulator to be kept fairly simple: only nine additional components are needed to complete the schema. Resistors RI and R2 are used to indicate when the battery voltage becomes low: as soon as the voltage on pin 3 becomes lower than 1.3 V, D1 lights. With values as shown for the potential divider, this corresponds to the supply voltage getting lower than about 6.5 V.
The output of the IC is shunted by a simple LC filter formed by LI, C3 and D2. The oscillator on board the IC generates a clock frequency of around 65 kHz and drives the output transistor via two NOR gates. The built-in error detector, the `battery low` indicator or the voltage comparator can block the clock frequency, which causes the transistor to switch off. The IC compares the output voltage of 5 V with a built-in reference (FET). Depending on the load, the FET will be switched on for longer or shorter periods. The maximum current through the FET is 375 mA, which corresponds with a maximum output current of 80 mA.
Tuesday, August 26, 2014
Simple Adjustable Threshold Temperature Alarm Wiring diagram Schematic
Simple Adjustable Threshold Temperature Alarm Circuit Diagram. This is a simple temperature alarm schema diagram, when Rl increases as temp decreases, the output of IC1 goes positive, turning on Ql. Ql conducts and causes Q2 to conduct, turning on the audible alarm. The threshold is set with potentiometer R2.
Adjustable Threshold Temperature Alarm Circuit Diagram
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