Micro Power Schmitt Trigger (CB25139E)

Using a CA3030, this circuit was found in the May 1988 Radio Electronics magazine. The power supply must be symmetrical.

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Simple rectangular oscillator (CB9217E)
This circuit was found in an EDN from the 90s. For the components indicated, the frequency is 10 kHz....
TIP31 and TIP32 1W Amplifier (CB25709E)
This small audio amplifier was found in the May 1994 issue of Electronics Now magazine. The power...
Logic Controlled Latching Relay (CB25739E)
Using the 4001 integrated circuit, this latching relay can employ any general-purpose transistor. The...