R1 may be 10k and R2 100k. The transistor can be the BC548 and instead of the small lamp we can use a series LED with a 1k resistor. D1 is germanium and C1 is 10 nF. C2 can be 47 nF.
This bistable or flip-flop is triggered by a negative pulse applied to the collector of the...
This circuit was found in the ON Semiconductor thyristor manual of the 1980s. As the drive is done by...
This sophisticated logic probe for 5 to 12 V circuits (CMOS and TTL) was found in a 1980s...