Voltage-controlled amplifier (CB8996E)

We found this circuit in an American documentation from the 80s. In it we have the way to control the amplifier gain by an input voltage.

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20 V adjustable power supply (CB8167E)
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15W Amplifier (CB18434E)
We found this circuit in a Japanese publication in 1967. The circuit consists of a 15 W audio...
Resistance Bridge (CB3911E)
This is a bridge for the measurement of low value resistances and high values too. The circuit...