Showing posts with label fixed. Show all posts
Showing posts with label fixed. Show all posts
Sunday, August 31, 2014
Switch Selected Fixed Voltage Power Supply Wiring diagram Schematic
This Switch Selected Fixed Voltage Power Supply Circuit Diagram can serve as a battery eliminator for various devices (such as tape recorders, small radios, clocks, etc.). Si selects a resistance that is predetermined to provide a preselected output voltage. In this schema, various commonly used supply voltages produced by batteries were chosen, but any voltages up to the rating of Tl (approximately) can be produced by choosing an appropriate resistor. Remember to provide adequate heatsinking for Ul.
Switch Selected Fixed Voltage Power Supply Circuit Diagram
Tuesday, August 19, 2014
12V fixed voltage power supply circuit diagram
Here this schema diagram is for +12V regulated (fixed voltage) DC power supply. These power supply schema diagram is ideal for an average current requirement of 1Amp. This schema is based on IC LM7812. It is a 3-terminal (+ve) voltage regulator IC. It has short schema protection , thermal overload protection. LM7812 IC is from LM78XX series. The LM78XX series IC is positive voltage regulator IC for different voltage requirements, for example LM7805 IC is made for 5 volt fixed output voltage . There is LM79XX IC series for negative voltage .
Circuit diagram of 12V fixed voltage power supply
A transformer(Tx=Primary 230 Volt, Secondary 12 Volt , 1Amp step down transformer) is used to covert 230V to 12V from mains. Here used a bridge rectifier made by four 1N4007 or 1N4003 diode to convert AC to DC . The filtering capacitor 1000uF,25V is used to reduce the ripple and get a smooth DC voltage. This schema is very easy to build. For good performance input voltage should be greater than 12Volt in pin-1 of IC LM7812. Use a heat sink to IC LM7812 for safeguarding it from overheating.
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