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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Simple photometer (CB20507E)
This 3-component circuit uses an analog indicator. We found it in an old publication....
Sequencer Using the 4013 (CB161E)
Pulses in sequence can be generated from a clock input using the circuit shown bellow. Outputs A,...
Simple Siren 555 (CB3862E)
This circuit simulates a low-level siren and can be supplied with voltages from 5 to 15 V....