Circuit knowledge

Power supply for EL-34 tube is specially designed for the purposes of power supply at the push-pull amplifier with EL-34 tube as in article 35 Watt Tube Power Amplifier Push Pull before. Power supply for EL-34 tube amplifier is made with transformers CT and 2 pieces diode as rectifier. Mechanical filters are applied in the power supply uses 3 levels. Power supply for tube power amplifier can deliver output voltages +220 VDC. Circuit details can be seen in the following figure.

The above power supply circuit has a high output voltage so that need to be considered in the manufacture and perakitanya because electricity can tesengat (stun). Power Supply For Tube Power Amplifier With Diode EL-34 was created specifically for the power amplifier tube push pull EL-34.

 Features

Available in space-saving packages: LLP, Exposed-DAP TSSOP, MSOP, and ITL

Ultra low current shutdown mode

Improved pop & click circuitry eliminates noise during turn-on and turn-off transitions

2.2 - 5.5V operation

No output coupling capacitors, snubber networks or bootstrap capacitors required

Unity-gain stable

External gain configuration capability

User selectable shutdown High or Low logic Level
Key Specification

Improved PSRR at 217Hz & 1KHz	62dB
Power Output at 5.0V, 1% THD+N, 4Ω (LD and MH only)	2W (typ)
Power Output at 5.0V, 1% THD+N, 8Ω	1.25W (typ)
Power Output at 3.0V, 1% THD+N, 4Ω	600mW (typ)
Power Output at 3.0V, 1% THD+N, 8Ω	425mW (typ)
Shutdown Current	0.1µA (typ)

Applications

• Mobile Phones
• PDAs
• Portable electronic devices

Datasheets

The Curiously Low Noise Amplifier takes benefit of the wonderful blast characteristics of the 2SK170 JFET to facilitate boasts a clamor voltage underneath 1 nV/burrow-Hz and practically rejection racket current. The noise voltage of the amplifier is just 1.4 nV/root-Hz by the side of 1 kHz, increasing to only 2.7 nV/delve-Hz by 10 Hz. The blare current is awkward to quantity, so this undemanding benefit amplifier can notice the clamor from a 50 ohm resistor and a 100k resistor, too. (The 1.4 nV input-referred clamor command rise to re 1.7 nV with a 50 ohm resistor, as an alternative of a sharply, and a 100k resistor will bequeath an input-referred racket approaching 40 nV, with very small contribution from the amplifier.)

This amplifier is a "service" amplifier with a secure of 100, with the purpose of would typically occur used at home a lab setting to boost tiny signals on behalf of measurement or else added doling out. It isnt intended to drive a spokesperson or else headphones in a straight line. (It may well drive the LM386 quite nicely.) The circuit is a minimal discrete transistor view circuit with two grow stages and a unique panache-A output buffer stage:

This amplifier has Output power about 500 Watt with the compatible voltage supply is under 63 Volt or same. If this amplifier operated the transistor output recomended to be place on the good heatsink. Because, the transistor will be hot. Transistor Ouput using SANKEN 2SC2922 and 2SA1216. Below describe the Circuit Diagram of 500W Power Amplifier :

Could you repeat that? can occur made to add to offered audio power amplifier? The answer is either decrease load impedance otherwise increase supply voltage. The drop the impedance, the extra current is wanted, making the construction of low impedance output stages other testing (at hand are selected other matter-of-fact limits), so consent tos increase supply voltage.

Components/parts list : 

R1,R11  47K

R2,R3 33K

R4 1K5

R5,R7 2K2

R6,R8 100R

UPS design of the model is divided into several types that produce different performance characteristics:

A. Standby

2. Line Interactive

3. Double Conversion On-Line

4. Delta Conversion On-Line

This type is commonly used by home users for the Presidency with their PC. UPS to be able to do this type of filtration against power failures and flow management, in addition to design efficient, small size and inexpensive.

UPS is the type most often used in small business unit, web developer, and a number of servers located in government departments. Because, in addition to having high levels of reliability, this type also have the ability to adjust the voltage that is sufficient

fine.

UPS has an inverter is always connected to the output of the UPS system to convert the power from batteries into AC. In normal circumstances, the Inverter will perform battery charging. While in a state of power outages, Transfer Switch will close and drain power from the batteries to the UPS output. Position that is always connected to the inverter output filter provides additional power. This makes the type of UPS is widely used for server and electrical conditions are not too good.

This type is most common for UPS with power more than 10kVA. These types have in common with the type of Standby. Only this type has a power source located on the inverter, not the AC power source. In this type, the main electricity supply interruption will not trigger a transfer switch for the incoming AC power to the central input to charge the batteries that provide power to the Inverter located at the output. Therefore, when the AC power is disconnected, the flow of energy will be transferred immediately without taking a break when the transfer occurs. This type of UPS above shows the performance of the average. Can be said of this type of approach the ideal of a UPS, unfortunately this type of heat is high enough.

Almost the same as the Double Conversion type, type Delta used to always supply voltage Inverter. When the power supply is interrupted, this type do the same with Double Conversion type. Delta Conversion has two functions, the first is to control the input power characteristics. While the second function is to control the input current to direct the process of charging the battery system. The thing to remember is to minimize this type of energy is wasted. In addition, it has a high compatibility to various types of generators and reduce the need for the use of cables.

This high power amplifier circuit with transistor was designed to provide a manipulate in lieu of the otherwise useless TO3 power transistors with the purpose of many hobbyists experience at home their throw out megabucks.  With upright construction the module is gifted of tall quality performance and is rated to 300 watts into a 4 ohm load depending on power supply.  With the driver and output transistors specified it is some degree of to DC rails of +/- 70 volts.

A simple class AB power amplifier electronic project can be designed using the STA543SA a 3-channels audio amplifier IC with DC volume control dedicated for each single channel. STA543SA it is a device suitable for 2.1 audio system thank to its output configuration with two single ended channels and one bridge. This class AB power amplifier based on the STA543SA will provide a 24 watts output power on a single channel and 7 watts output power on the rest of channels . All output channels require a 4 ohms load .The Short Circuit Protection, the Thermal Protection and the Diagnostics Functions are integrated in the STA543SA power amplifier IC.
With this class AB power amplifier it is possible to amplify three analog signals Left, Right, Subwoofer coming from separated sources or to generate the BASS part to be sent to the Subwoofer via a passive crossover network .
The input Cut-off frequency is set by the external capacitor (C4,C8,C10) values and by the internal Input Impedance Rin ( 30KΩ typ) .
The stand-by can be easily activated by means of a CMOS level applied to pin 9 through a RC filter. In order to avoid the thermal protection intervention that is placed at Tj=150°C (Thermal Muting) or Tj=160°C (Thermal Shut-down), it is important the Heat Sinker RTH (°C/W)dimensioning.
A thermal heatsink with a value 4.3 °C/W will be required for three outputs (24W + 2 x 7 W) powered from a 14.4 volts DC .

Subwoofer power amplifier circuit based on IC OPA541BM very suitable for use in subwoofer speakers, these amplifiers possess excellence in sound issued because the sound is very clear and issued in accordance with subwoofer speakers in a low tone.

Power amplifier has up to 1000 Watt power, this circuit made one channel only so if you want to create a stereo in it must be made one again, actually this is more suitable power amplifier in use for Sound System or outdoor, so if only in use for the house I think is less suitable.
Maybe youve seen or even have an active speaker and there is written 1500 watts PMPO (Peak Music Power Output), make no mistake this is different from Power Amplifier Active Speaker, I often dismantle such Active Speaker in it only a power with power no more than 150 watts by using the transformer 2-3 Ampere. PMPO is not a real power which is issued by the Power Amplifier, but counting all the speakers that there is, for example: if there are 5 pieces of speakers on each channel and each speaker has a power of 10 W then it is 100 W PMPO.

1.2V – 12V with regulated current limiter through resistors
Person see the website wants DC Volt adjustable Regulate 1.2V to 12V current 1-2A sizes at the first stage me think will choose the circuit that use IC LM317. But he tells have IC LM723 the many. Then of this circuit better which this easy circuit, use integrated number this circuit. And still use number transistor TIP41 0R TIP31 help enlarge current get about 1-2A fine VR1 for choose Volt follow want. The detail is other can see in the circuit has and original website http://www.elektroda.net/warsztatowe/zasilaczelabor.html

DC Power Supply Dual-rail Variable Circuit

* The circuit can be placed into the existing Variable DC Power Supply metal cabinet.

* Q1 and Q2 must be mounted on heatsinks. Usually, bolting them to the metal case (through insulating washers etc.) proved effective.

* The full ±15V output can be achieved only if the secondary winding of the supply Transformer used in the Variable DC Power Supply is rated at 48V minimum (center tapped).

* When using this circuit, please set the Current-limit control (P1) of the Variable DC Power Supply to any value comprised in the 50mA - 1A range but not higher.

* The second Op-amp (IC1B) contained in the LM358 chip was not used, but its input pins were tied to the negative supply and the output was left open.