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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3-Transistor Radio (CB21641E)
Found in the July 1968 Supertena Bulletin of a Popular Electronics, this receiver makes use of the...
Switched Power Supply from 4.5 to 30 V x 6 A (CB13505E)
This switching source was obtained in a 1976 National Semiconductor manual. For the indicated...
Crystal Oscillator LM339 (CB17388E)
This configuration appears several times on this site. The circuit can generate a 100 kHz or other...