Frequency Doubler (CB21065E)

This circuit was obtained from an Analog Devices manual from the 90's. The integrated circuit is from the time.

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Simple Transistor Tester I (CB18917E)
We found this simple transistor tester in a French publication in 1981. It uses a common analog...
Speed Game (CB22072E)
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Photodiode Amplifier (CB4950E)
This circuit is from an 80's component manual. The components are from the time, but the circuit...