This circuit was found in July 1975 Radio Electronics magazine. Power depends on the trigger transistor and the effects of capacitors C1 and C2.
This circuit, which can be used as a shield, was found in General Electric documentation from the...
In figure 1 we have an application for NLAS5113, a new device from On Semiconductor...
We found this circuit in an old documentation. Transistor can be BC548 and relay according to...