Circuit Project Electronic

The -12 volt supply, like the +12 volt supply, uses discrete components rather than a 7912 voltage regulator IC. Here, we use a 1N4742A Zener diode, rated at 12 volts, 1 watt, as the main regulating element.
The power supply shown in the above schematic diagram uses a Zener diode as the main regulating device, to [...]

This is circuit Fix power supply Regulator 40V 2A for main Power Amplifier 30W.
It is use IC LM317T (Hot IC Variable Regulator) and Transistor TIP42 for boost up Current to 2A max . Other detail see in circuit.
A very good and powerful Regulated Power Supply section was implemented by simply adding a PNP [...]

Parts:
P1_________________22K Log.Potentiometer (Dual-gang for stereo)
P2________________100K Log.Potentiometer (Dual-gang for stereo)
R1________________820R 1/4W Resistor
R2,R4,R8____________4K7 1/4W Resistors
R3________________500R 1/2W Trimmer Cermet
R5_________________82K 1/4W Resistor
R6,R7______________47K 1/4W Resistors
R9_________________10R 1/2W Resistor
R10__________________R22 4W Resistor (wirewound)
C1,C8_____________470nF 63V Polyester Capacitor
C2,C5_____________100µF 25V Electrolytic Capacitors
C3,C4_____________470µF 25V [...]