This circuit was found in a Motorola Manual of 1965. The circuit has neon lamps as trigger elements. Equivalent SCRs can be used.
This Intersil circuit was found in a 1980s documentation. Operational are of the time, but current...
Found in a 1969s American documentation, this circuit uses transistors from that time. The...
The movement of the indicator needle indicates when something or someone approaches the sensor, an...