LM741 Voice Filter (CB25936E)

This 300 Hz to 3.4 kHz filter was found in the May 1989 Radio Electronics magazine. The circuit requires a symmetrical power supply.

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SCS 5 kHz stages (CB9068E)
This SCS counter circuit was found in a 1964 General Electric documentation. The circuit has a...
Reflex receiver (CB23633E)
This simple 1-transistor reflex receiver was published in Radio Electronics magazine in September 1959....
High Impedance Differential Amplifier (CB4896E)
Operational amplifiers used in this 80's circuit is not very common today, but the setting can be...