tape player amplifier (CB7301E)

Found in a 1968 Electronics World, this circuit uses operational amplifiers from that time.

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Voltage to frequency converter with potentiometer (CB6995E)
This application circuit for the AD6521C was found in Radio Electronics from the 90's. The circuit...
TTL Siren (CB9080E)
This simple TTL siren was found in a 1980s Electronics Today International. The power supply is 5 V...
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This circuit simulates an 18-point digital display using light bulbs, but can be adapted to use...