Free Electronic Circuit Schematics » Adjustable power supply

2-36V adjustable regulator power supply circuit with LM1458

admin — Mon, 01 Feb 2010 14:47:39 +0000

: 18-36 power control

This power supply circuit is adjustable 18-36 volts and is currently shown as being limited to 2 amps, but up to 3 amps in a small current sense resistor of Options (0.3 ohm). 2N3055 and 2N3053 transistors should be in wells. very hot right now and resistance is to be made at 3 watts or more. Voltage, which is controlled by 1 / 2 of the LM1458 Op Amp, or 1458-AMP. It can be replaced in the circuit below, but sources indicate pressure. Pin 8 to 30 VDC supply is limited, which may increase by 6.2 Vdc or 5.1 Vdc. Zener K-series resistance, is 8-pin. Maximum supply voltage DC for LM1458 and LM1558 are 36 and 44, respectively.

Should be the power transformer. As expected the power supply. Enter at least 4 times the desired output voltage, but can not exceed the op-amp under conditions of low stress. Transformer is used as a center, see 25.2 volts AC / AMP 2 units to regulate the 24 volts at 0.7 amps, 15 volts at 2 amps or 6 volts at 3 amps. Output AMP 3 is the center of the water. Transformer that changes the position of 18 volts. All components must be an exception from Radio Shack LM1458 op-amp.

Adjustable regulator power supply circuit with LM317

admin — Sun, 04 Oct 2009 03:03:56 +0000

LM317 Variable Power Supply Regulator

A circuit is timeless. LM317 regulator is a versatile and highly efficient 1.2-37V voltage can provide up to 1.5 Amps. of current with a large heat sink.

It is ideal for almost any application. This was my first power source workbench and I still use it.

Since LM317 is protected against short circuit, fuse is not necessary. With the decline automatic temperature control, will be shut down if overheating. However, a very powerful (and cheap!) Package contrary.

The LM317, even if it is able to supply up to 37V, the circuit shown here is limited to 25V for safety and simplicity. Any output voltage requires additional components and a heat sink more.

Oh! Sure that the input voltage was at least a couple of times as the desired output. It’s agree to use a trimmer if you’re building a fixed power supply voltage.

Issue:

Follow all safety precautions when working with mains voltage. Insulate all connections on the transformer.

Possible applications:

The desktop power variable, fixed line voltage almost all possible applications, when more than 1.5 is required.

Adjustable Power supply 0-30 Vdc / 5A with LM732

admin — Fri, 19 Jun 2009 04:49:22 +0000

Adjustable Power supply 0-30 Vdc /5A circuit

Accessories List

R1=1.2Kohm C1=4700uF/63V IC1=LM723 V1=0-30V DC
R2=680ohm C2=100nF63V MKT Q1=2N3055 TR1=220VAC/ 27V 4A

R3=0.33ohm/5W C3=4.7nF63V

MKT B1=Brindge 100V 5A S1=2×10A SW
R4=15Kohm C4=220uF/63V F1=0.5A Fast Fuse
R5=3.9Kohm P1=4K7 LOG. POT. F2=2A Slow Fuse

Notes

This regulator in circuit comes in a TO-3 case and must be used with a large heatsink. You should be to mount a small fan to blow air across the regulator .
For the filter capacitor is large. The filter won’t fit on any board that bolt it to the case.
You can, of course, add a volt and amp meter.
Since this project operates from 120 VAC, you must include a fuse and build the project in a case.