0-50V 1A power supply with CA3086

Posted on Jan 20, 2013

This power supply circuit is highly stabilized that its output voltage will drop only 0.005% even though the load changes from 0 to 100%. Another excellent capability is that the output voltage will change only by 0.01% if the input voltage fluctuates. The capability if the circuit to be adjusted from 0.1V up to 50V is due to the application of opamp IC CA3130 in the circuit. Transistor T4 raises the output voltage to higher level, and at the same time it separates the lower level opamp from the high level of the output voltage.

0-50V 1A power supply with CA3086
Click here to download the full size of the above Circuit.

The reference voltage is supplied by IC1. It is a temperature compensated transistor array with 5 transistors. Four of these transistors are used as reference diodes and the fifth one sets the output impedance of the reference source. The reference voltage is set through P1. The opamp CA3130 compares the reference voltage at its minus input to the output voltage at its input. The output voltage passes first through a voltage divider before it is fed into the plus input of the opamp. Transistors T1 and T2 work as darlington pair and amplifies the current. Transistor T3 functions as current limiter. The current limit is ajustable through P1, and the lowest current limit is 0.6 ampere. Once potentiometer P1 is set at maximum, current limiting is disabled.

Leave Comment

characters left:

New Circuits



Popular Circuits

Timer Blox
pwm Why is the MOSFET driver in this circuit dying
30w class ab amplifier circuit with
pll fm demodulator
5 minutes time delay
ir remote control home appliances
QCard Controller 68HC11 Processor
Taylor Source Follower
Basic circuit diagram connection of signal and power ISO107
Real-time speech recognition system application circuit in family care robot