100w-RMS audio power amplifier

Power Amplifier Feature

• 100w-RMS audio power amplifier
• Supply voltage: +/-40Vdc
• Output power – RMS (4Ohm): 100W
• Output power – RMS (8Ohm): 60W
• Frequency response (100W-4Ohm): 20Hz-20KHz (-0.5dB)
• THD (100W-4Ohm, 20Hz-20kHz) < 0.1%
• THD (100W-4Ohm, 1kHz) < 0.01%
• Input sensitivity (100W-4Ohm): 1Vrms
• Input impedance (1kHz): 10kOhm
• DC offset: max. +/-10mV
• Quiescent current (adjusted with P1): 10mA (3.3mVdc on R14)
• Suggested power supply (for one channel):

1.  2 28V-AC (loaded voltage) 160VA mains transformer.
2.  10A-200V rectifier bridge.
3.  10.000uF 50V ELKO / supply rail .

ST151 100W Power Amp Circuit

We provides PCB and components layout picture thus as below.

ST151 100W PCB Top Side

ST151_100W_PCB_Bottom

Parts list (for 1 channel)
Resistor
0.33 5W 4
6.8 2W 1
47 0.5W 1
100 0.5W 3
220 0.5W 2
470 0.5W 1
680 0.5W 1
820 0.5W 2
2.2k 0.5W 1
3.3k 0.5W 2
6.8k 0.5W 2
12k 0.5W 1
15k 0.5W 2
Capacitor
47p 50V 2
470p 50V 2
10n 63V MKT 2
100n 63V MKT 3
220n 100V MKT 1
3.3u 50V ELKO (or 16V tantalum) 1
47u 50V ELKO 2
100u 16V ELKO 1
Diode
1N4148 6
1N4003 2
Transistor
BC547 4
BC557 1
BD139 3
BD140 2
BD249C (or TIP35C) 2
BD250C (or TIP36C) 2
Other
1k trimmpot (6mm horizontal) 1
4A fast-blow fuse 2
fuse holder 2