We found this circuit in documentation from the 90s. The circuit uses components that are still common today, turning off a load after the programmed time. The time is given by the capacitor.
This circuit is from an October 1963 Radio Electroncs. It uses a single 2N18383 transistor and a...
This circuit has a gain of 34 dB and a good power to be used as an audio booster in cars. The...
A flash of light directed at the LDR causes the SCR to fire and the motor to be activated in the...