10-Step Sine Generator (CB24472E)

This CMOS generator with the 4018 IC was found in a November 1976 Radio Electronics magazine. It uses a 741 op-amp as the audio amplifier.

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60 Hz Rejector Filter (CB13588E)
This filter can be used to eliminate hum in sound equipment. Operational amplifiers can be 741 and...
427 to 439 MHz booster (CB7438E)
This signal amplifier for ATV in the 427 to 439 MHz band was found in a magazine 73 for radio...
Temperature sensor (CB10171E)
This simple three-LED sensor uses an NTC at the input. The circuit is based on an uncommon...