Speaker protection (CB8193E)

Found in a 90s Silicon Chip documentation this circuit is intended to protect a speaker system in case of amplifier failures.

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Medium Wave Transmitter (CB21736E)
Found in Popular Electronics of January/February 1969, this transmitter has a few meters range and can...
60 Hz CMOS (CB15920E)
The circuit shown in the figure can serve as a basis for frequency meters, clocks. Stopwatches and many other...
Vibration Sensor LM10 (CB14310E)
The integrated circuit used in this project is unusual. However, we can take advantage of the...