This 1 A circuit was found in a Philips documentation from 1966. The transistor is of the time, but a modern transistor of equivalent power can be used.
The search coil of this detector consists of 140 turns of wire 18 in an 8 inch diameter form. The...
This circuit was obtained from a 1966 General Electric documentation. It can serve as a basis for...
The quiescent current of this alarm is in the order of microamps and the same is true for the...