Found in a Popular Electronics from the 90s, this circuit can be used as an electrifier. T1 can be an old TV fly back transformer or an ignition coil.
The circuit shown was found in a 1988 documentation, giving an indication of value in an...
In the figure we have the simple way to obtain an integrator with a type 741 operational...
This circuit produces a sound effect that can range from the sound of a bird to a siren. The...