tape player amplifier (CB7301E)

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

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Target Shooting (CB18207E)
These simple weapon and target circuits with emitter and photoelectric sensor were found in a 1985...
Thermocouple amplifier (CB3938E)
We found this circuit in an old publication dealing with operational amplifiers. The circuit uses...
Thyratron Replacement (CB6560E)
Suggested by General Electric in a 1967 documentation, this circuit replaces the Thryraton tubes used at...