Fig. 1 - Simple 3 Transistors Power Amplifier PCB |
This mini amplifier was tested in two stages, one with 24V, with a non-symmetrical power supply, and in 30V also with non-symmetrical power, the result you can watch in the original video at the end of this post.
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The Amplifier Circuit
The amplifier circuit is very simple to be arranged in figure 2 just below, it is divided into two stages:
- The first stage is the pre-amplification and at the same time used as a drive to boost the output stage. It is formed by a transistor medium power the BD139, which supports a voltage of up to 80V and a current of 1.5A with 12.5 W of power, according to the Datasheet of the same.
- The second is the power stage, which is formed by the complementary transistors NPN - 2SC5200 and the PNP - 2SA1943 transistor, with 100W of power and high fidelity, whose collector current supported is 15 Amps.
Place the power transistors in a heat sink, especially if you are going to apply a voltage greater than 20V and use the amplifier continuously, they will heat up.
Component List
- T1 ---------- NPN 2SC5200 Power complementary transistor
- T2 ---------- PNP Complementary Power Transistor 2SA1943
- T3 ---------- NPN BD139 transistor
- D1, D2 ----- Diode 1N4007
- C1 ---------- Electrolytic capacitor 2.200uF - 63V
- C2 ---------- Electrolytic capacitor 4.7uF - 25V
- R1, R2 ----- Resistor 0.22 ohms - 5W - (red, red, silver)
- R3 ---------- Resistor 1k ohms - (brown, black, red)
- R4 ---------- Resistor 100k ohms - (brown, black, yellow)
- P1 ---------- 10K ohm potentiometer
- Others ----- Wires, Welds and Etc.
Direct link to download
Click in the link below to download the Files: PCB Layout, PDF, GERBER
Click Here!!!
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hey!!!! All files are missing!!! Please re send me the files!!! [email protected]
ReplyDeleteHello @MARTIN LUCERO
DeleteThe link has now been repaired.
It may already be downloading the files.
Regards!
Can this really push 600w? Usually for 2 power transistors it's about 100w..
ReplyDeleteHi @OPTUNE FITNESS
DeleteThis amplifier doesn't have 600W output, it's impossible to do that with two transistors.
The title says it pushes a 600W Subwoofer.
In our tests, the maximum we got was 90W.
It's a great entry-level amp to build.
Regards!