Multi voltage power supply circuit  using IC-78xx series
This is Multi voltage power supply circuit  as electrical circuit to supply DC power positive and negative. It also has multiple power levels as well. The equipment it easy to buy and affordable. Operation of this circuit, when T1 was to convert the AC voltage from 220 volts down to …
9V Negative power supply units
Today I find a negative power supply units circuit on 9Volt sizes to give my friends. But the most circuit is positive voltage supplies only. Therefore I think will get back to the direction of the electricity to negative form. When use Transistor 2SC1061 or TIP31 as a result give …
+12V,-12V power supply using LM7812,LM7912
Here is circuit Power Regulator +12V,-12V. Use IC –LM7812 for +12V and IC LM7912 for -12V. This is circuit for Preamplifier play nice Music.Detail See in circuit. I plan to show you, with an interesting concept.When I was make pre-amplifier circuit is small. I did not plan on the power …