0 To 12V, 1A Variable Power Supply Circuit


Posted on Mar 9, 2013

This 0- to 12-Vdc variable power supply uses an IC voltage regulator and a heavy-duty transformer to provide a reliable dc power supply. Looking at the schematic shown, you can sec that transformer Tl has a 120-V primary and a 28-V secondary. Filtered dc is fed to the input (pin 2) of the LM317T voltage regulator, IC, which keeps the voltage at its output constant (pin 3) regardless (within limitations) of the input voltage.


0 To 12V, 1A Variable Power Supply Circuit
Click here to download the full size of the above Circuit.

Pin 1 of the LM317T is the adjustment pin. Varying the voltage on pin 1 (via PI) varies the output voltage. Diodes D5 through D7 and LEDs LI through L3 give an approximate indication of the output voltage. Each LED/diode path has a limiting resistor to limit the current to a level that is safe for the LED.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Doorbell
Simplest atmega8 programmer Using LPT Port
Use of N-channel power MOSFET on BQ78PL114
Multiplexed Seven Segment Displays - Part II
ta8210ah car audio amplifier circuit
ecm mic preamplifier
LASER DIODE SOURCE
ADT70 internal functional block diagram



Top