This flasher or light pulsator can be used in an ordinary flashlight. The circuit can be adapted to use a lamp instead of an LED. Transistors support equivalents. C1 determines the frequency range.
We found this circuit on Radio Electronics from July 1990. It triggers a relay with a touch of the...
In the figure we have a configuration that allows to test NPN transistors and with the addition of a...
The figure shows how to implement a No – OR or NOR function with 1 general purpose transistor. The supply...