This circuit, with a 12 V input, was found in a Popular Electronics from the 1990s. Information is given about the ferrite-wrapped transformer. The transistor must be mounted on a heatsink.
Found in a publication from the 60's, this circuit uses the CK722, germanium transistor of the...
From an input signal, and using an unusual current source, this circuit generates a ramp, that is, a...
With this timer we can start between 30 seconds and one and a half seconds, time set in the pot....