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16
10 Watt Power Amplifier
270
Iq = (about) 40mA
12k
Tr3
10k
47µ
22k
47
Tr6
Tr4
1k
47µ
1k
1
(2 watt)
47
Tr7
1k
1
(2 watt)
470µ
2500µ
4k7
Tr1
Tr2
Tr5
10k
R
32µ
33k
32µ
220
4k7
Transistors:
Tr1 BCY70 (or BC 182L or BC212L or BC214L)
Tr2/3/4 BFY50/51
Tr5 BFX88
Tr6/7 2N3055
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.
Test point
Tr1(e)
Tr1(c)
Tr2(c)
Tr3(c)
Tr4(e)
Tr5(e)
Tr5(c)
Tr7(c)
Approximate
voltage
12·5
0·65
12·5
14·4
13·7
13·1
0·6
13·1
© David Hoult 2001
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