Power Amplifier Circuit with 2n3055
Simple and low cost. The optimal accumulation voltage is about 50V, but this amp assignment from 30 to 60V. The acute ascribe voltage is about 0.8 – 1V. As you can see, in this architecture the apparatus accept a big tolerance, so you can body it about of the components, which [...]

16 Watt Power Amplifier Circuit
parts:
U1 U2 LM383 8 watt audio amplifier ic
R1, R3 220 ohm resistor
R2, R4 2.2 ohm resistor
R5 1 megohm resistor
R6 100k audio taper potentiometer
C1, C7 10uf electrolytic capacitor
C2, C5 470uf electrolytic capacitor
C3, C4, C6 0.2uf ceramic capacitor
SPKR1 4 to 8 ohm speaker (up to 8 inches diameter)
all resistors are 5 or 10 percent tolerance, 1/4-watt
all capacitors are 10 percent tolerance,
rated 35 [...]

High Speed µPs With 8A Switcher High Performance Circuit
All high-current switchers are sensitive to board layout; take care when designing the pc board. You’ll obtain the best results by using a multilayer board, so you can dedicate a single layer to ground plane. You should tie the “power” components (C1, C2, C16, D2, C12, C13, [...]