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Transcript
```6
Low Power, Three Transistor Amplifier
+12v
2k2
c
b
e
220
47k
220µ
1
green
1
100µ
e
output
b
input
4k7
15k
c
1k
25µ
-
T1 BC109C
T2 BD679 or BD683
T3 BD680
As can be seen from the circuit diagram we are really using five transistors
as the BD679 and BD680 are “Darlington” pairs of transistors. The led must
be a green led for correct operation. (The voltage across a green led is
higher than the voltage across a red led.) When using a 12v supply the
voltage at T1 collector should be (about) 5v and at T2 base (about) 7v. This
amplifier will be unstable (it will oscillate) without the 4k7 variable resistor
connected to the input.