This is easy circuit power supply, variable regulator adjustable voltage output 0V to 15V and Current adjust 0A to 1Amax. Use normal electronics part.
TR1 provides a constant current to a bank of three zener diodes, thus maintaining a constant voltage independant of supply voltage variations. The resistor Rx is used to sense the PSU output current and to switches off the current to the zener diodes should the output current become excessive. The 1M0 (logarithmic taper) pot causes the current sensor (TR2) to “kick-in early”, so providing a variable current threshold limit. The value of RX should be (0.7/Amperes) ohms, where Amperes is the maximum output of the bench PSU. The prototype was set to 1-ampere, so Rx should be 0.5 / 1.000 = 0.5 ohms. The resistor should be rated at 1-watt, or 2x 1R0 500mW resistors in parallel for 1-ampere maximum output. I have used 4x 1R0 ohms in parallel (0.25 ohms) and have achieved 2-amperes (with a bigger heatsink).
[...]
Read More Source:http://web.telia.com/~u85920178/use/psu3.htm
Thank you.
Related Links
More circuit about Variable Regulator
More about Mini Project
More about 15V variable volt regulator
Simple power supply variable Voltage 0-15V, max output 1A.
Regulator +15V -15V 1A by IC 7815 & 7915
LM2575 Switching Regulator 1.2-12V for Solar
power supply regulator 0-30V 2A by L200 and TL7705
top LM317 regulator
regulator 1.25-30V 1A By LM317T(with PCB)
Power supply regulator 0-30V 1A by IC 741 + 2N3055
Power supply regulator 0-50V 2A by IC LM723 + 2N3055,BD140,A671
Regulator 0-30V 5A by IC 723 , 2N3055 x2
This entry was posted on Wednesday, September 12th, 2007 at 9:39 pm and is filed under Power supply, Variable Regulator.
