This circuit is from an American publication of the 80's. It makes use of components of the time. However, the circuit is the basis for a modern shield application since the input is TTL.
Mouser Electronics is supplying the SMi (Silicon Microestructures) uncompensated low pressure...
This circuit was found in a 1977 Radio Shack documentation. The unijunction transistor can be...
The search coil of this detector consists of 140 turns of wire 18 in an 8 inch diameter form. The...