This circuit was based on Maxim's MAX4374. The circuit senses the current in a 0 to 20 V line and has a timed output signal, with time given by R1 and C1. Power is supplied with 5V.
We found this source with the CI 723, common at the time, in a 1989 paper. Power transistors must be...
Found in an American 80's documentation, this circuit can use common FETs like the BF245 and cover...
This simple passage alarm is powered by the power grid using an LDR as a sensor. The circuit is...