This is 12V dual power supply circuit using 7812 and 7912. We use IC-LM7812for +12V and IC LM7912 for -12V. This is circuit suitable for a preamplifier play nice Music. Detail See in circuit.
I plan to show you, with an interesting concept. When I made pre-amplifier circuit is small. I did not plan on the power supply. It requires low supply current is only 100mA. But the need for dual voltage. Or 3 line is +12 V,-12V and Ground.(Using 12 volt dual power supply circuit)
At that time, I have not the least knowledge and a few pieces of equipment. The regulator ICs I use IC7812 and IC7912 (hard to bought). I make this circuit. It works great.
Read more 12v power supply circuit using 7812
12V dual power supply circuit
In the circuit, I use diodes D1, D2, only both because I’d forgotten to add, and this is a low current, using a half-wave diode rectifier enough. and The transformer is 300mA -15V CT 15V that cheap than other sizes.
- IC1-IC2 do not need to hold the heat sinks because of the very low currents
- LED1 is an indicator of Power ON that R1 is the current limiter of LED1.
- C1, C2, C3, C4 are the first filter that time I have them many so place various 2200uF.
How to built.
This project I put them on the perforated board, it easy to use, and so cheap. But at the time I put wrong pin capacitor when entering the power supply, causing it to burst. I was shocked very much. But I do not Discontinue this project.
All my experience, when I was young. About building electronic circuits.
Thank you for reading the poor English story.
Also the 12V dual power supply circuit
We can adjust voltage at 12V.
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