This circuit is simple voltage regulator, where have not current limiting (output protection circuit). but, it is useful for who plan start the DIY electronic project or experiment.
The board have some jumper, because I try to make the board small and quick.
The input power transformer 230V to 15-0-15 (30VA)
|Diode 1N4007||8||D1, D2, D3, D4,
D5, D6, D7, D8
|Electrolytic capacitor 2200uf 50V||2||C1, C2|
|Electrolytic capacitor 10uf 16V||2||C5, C6|
|Electrolytic capacitor 1uf 16V||2||C7, C9|
|Resistor 1/4W 220R||2||R3, R5|
|Resistor 1/4W 150R||2 (will difference)||R11, R12|
|Resistor 1/4W 4.7k||2 (will difference)||R1, R2|
|Variable Resistor 2.5k||2||R4, R6|
|Variable Resistor 100R||2 (optional)||R4', R6'|
|Jumper||2 (will difference)||D11, D12|
|Reserve||4||C3, C4, C8, C10|
This is simple circuit, but, it still have a lot of basic knowledge inside. (for electronic newbie)
First, you have to understood how to choose transformer for you circuit. you can read post at below.
Understand transformer - basic
Reservoir Capacitor (filtering capacitor)