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Transistors:
Tr1 BCY70 (or BC 182L or BC212L or BC214L)
Tr2/3/4 BFY50/51
Tr5 BFX88
Tr6/7 2N3055 |
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Risk of instability if no
input connected. When testing, connect R (about 3k3).
Needs well smoothed power supply of about 20 to 30 volts.
Peak power is well over 10 Watts. |
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The table below shows the
approximate voltages to be expected when using a 24v
supply and with the variable resistor set to give a
current of about 40mA in the output stage. |
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Test point |
Approximate voltage |
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Tr1(e) |
12·5 |
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Tr1(c) |
0·65 |
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Tr2(c) |
12·5 |
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Tr3(c) |
14·4 |
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Tr4(e) |
13·7 |
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Tr5(e) |
13·1 |
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Tr5(c) |
0·6 |
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Tr7(c) |
13·1 |
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Circuit diagram : Component Side |
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Circuit diagram : Copper Side |
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Acknowledgements : The 10W amplifier is taken from "Transistor
Audio and Radio Circuits" published by Mullard.
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© David Hoult 2009
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Open Door Web Site