This is a handy, easy to build general purpose 50 watt amp. The
amp has an input for a radio, TV, stereo or other line level device. It also has
a phono input for a record player, guitar, microphone or other un-amplified
source. With the addition of a low pass filter at the input, it makes a great
amp for a small subwoofer.
Schematic
Parts
R1 ....................... 200 Ohm 1/4 W Resistor R2
....................... 200K 1/4 W Resistor R3 ....................... 30K
1/4 W Resistor R5 ....................... 1K 1/4 W Resistor R6
....................... 5K 1/4 W Resistor R7,R10 ............... 1 Meg (5%)
1/2 W Resistor R8,R9 ................. 0.4 Ohm 5 W Resistor R11
..................... 10K Pot R12,R13 ............. 51K 1/4 W Resistor
R14 ..................... 47K 1/4 W Resistor C1 .......................
100uF 35V Electrolytic Capacitor C2 ....................... 0.011uF
Capacitor C3 ....................... 3750pF Capacitor C4,C6
................. 1000pF Capacitor C5,C7,C8 ........... 0.001uF Capacitor
C9 ....................... 50pF Capacitor C10 .....................
0.3uF Capacitor C11,C12 ............. 10,000uF 50V Electrolytic Capacitor
U1,U2 ................. 741 Op Amp U3 ....................... ICL8063
Audio Amp Transister Driver thingy Q1 ....................... 2N3055 NPN
Power Transistor Q2 ....................... 2N3791 PNP Power Transistor
BR1 .................... 250 V 6 Amp Bridge Rectifier T1
....................... 50V Center Tapped 5 Amp Transformer S1
....................... SPST 3 Amp Switch S2 ....................... DPDT
Switch F1 ....................... 2 Amp Fuse SPKR1 ................ 8
Ohm 50W Speaker MISC ................... Case, Knobs, Line Cord, Binding
Posts Or Phono Plugs (For Input And Output), Heatsinks For Q1 And Q2
