Upon pressing the switch, the circuit generates a pulse whose duration depends on C. The transistors can be BC548 and the power can be between 1 and 6 V. The circuit is from a 1975 publication.
The figure shows how to implement an amplifier with gain 10 using the operational amplifier LM41....
This circuit is from 1997 documentation. Its purpose is to start a water pump controlling the...
This circuit is from a Popular Electronics from the 90s, consisting of a repeater relay for remote...