Melody Generator (CB25350E)

Based on an LS3404 this circuit was found in the July 1990 issue of Radio Electronics magazine.

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Binary and Decimal Counter (CB17422E)
This didactic circuit was found in a 2001 documentation. It presents the result of programming in binary...
Variable Frequency Oscillator (CB22465E)
This VFO circuit generates signals from 2 Hz to 50 Hz. We found it in Popular Electronics from...
3-Tone Oscillator using the741 C (CB4426E)
This circuit can be used as a buzzer from 3 different locations, allowing you to identify where it went...