Locking circuit with the LM3909 (CB14294E)

This latched switch configuration was obtained from National Semiconductor documentation on the LM3909. The circuit works with a 3 V power supply.

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Time control (CB8340E)
This timer circuit was found in a 1980s American documentation. Transistors and SCR support modern...
Four Voltage References with the LM139 (CB14248E)
The circuit shown below provides four adjustable reference voltages. Each of them is produced by a...
Simple Oscillator (CB23708E)
This well-known oscillator with complementary transistors was found in Radio Electronics magazine from...