Alternating tone siren 555 (CB9202E)

Found in Radio Electronics from the 90s, this siren finds many variations on this site. The transistor must be equipped with a heat radiator.

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Exposure time meter (CB8114E)
Indicated by a Popular Electronics of the 90s originally to measure the light determining the exposure...
TTL Buffer MC34071 (CB15280E)
Other operational amplifiers series, such as the MC34072, MC34074, MC35071, MC35072, MC35074 d...
Source follower (CB6963E)
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