Schematics > Audio > 50 Watt Amplifier
50 Watt Amplifier
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
| Part |
Total Qty. |
Description
|
| R1 |
1 |
200 Ohm 1/4 W Resistor |
| R2 |
1 |
200K 1/4 W Resistor |
| R3 |
1 |
30K 1/4 W Resistor |
| R5 |
1 |
1K 1/4 W Resistor |
| R6 |
1 |
5K 1/4 W Resistor |
| R7,R10 |
2 |
1 Meg (5%) 1/2 W Resistor |
| R8,R9 |
2 |
0.4 Ohm 5 W Resistor |
| R11 |
1 |
10K Pot |
| R12,R13 |
2 |
51K 1/4 W Resistor |
| R14 |
1 |
47K 1/4 W Resistor |
| C1 |
1 |
100uF 35V Electrolytic Capacitor |
| C2 |
1 |
0.011uF Capacitor |
| C3 |
1 |
3750pF Capacitor |
| C4,C6 |
2 |
1000pF Capacitor |
| C5,C7,C8 |
3 |
0.001uF Capacitor |
| C9 |
1 |
50pF Capacitor |
| C10 |
1 |
0.3uF Capacitor |
| C11,C12 |
2 |
10,000uF 50V Electrolytic Capacitor |
| U1,U2 |
2 |
741 Op Amp |
| U3 |
1 |
ICL8063 Audio Amp Transister Driver thingy |
| Q1 |
1 |
2N3055 NPN Power Transistor |
| Q2 |
1 |
2N3791 PNP Power Transistor |
Notes
1. I know I skipped R4. That is not a problem :-)
2. Distortion is less than 0.1% up to 100HZ and increases to about 1% at
20kHz.
3. I haven't been able to find anyone who sells a suitable T1. You can always
use two 24V 5A units in series. If you are building two amps (for stereo), then
I would suggest using an old microwave transformer and rewinding it.
4. Q1 and Q2 will require heatsinks.
5. You may have trouble finding U3 because it is discontinued. Please don't
email me about sources...I can't find it either. A possible source was sent in
by JBWilliams:
Zigma Electronics
8803 Shirless Ave.
Northbridge, CA 91324
United States
Phone: 818-772-7590
Title: 50 Watt Amplifier
Source: www.electronics-lab.com
Published on: 2005-02-01
Reads: 1500
Print version:  Other schematics from Audio
Sound Level Meter Stereo Tube Amplifier 200W audio amplifier Amplifier of acoustic frequencies with preamplifier Digital Volume Control Speaker Microphone Speech Recorder 1W Bass Power Amplifier 250 mW Audio Amplifier Ultrasonic pest repellent
Schematics > Audio > 50 Watt Amplifier |
Home
