Differential temperature detector (CB21284E)

Found in Popular Electronics from the 90's, this circuit makes use of common components today.

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Impedance Matcher (CB14462E)
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Telephone extension alert (CB8627E)
Found in a 1993 Electronics Hobbyst Handbook, this circuit uses components that are still common...
555 Pulse Width Generator (CB25959E)
This pulse width-tuned circuit was found in the March 1996 issue of Electronics Now magazine. The...