For signals up to about 500 kHz modulated in amplitude and transmitted by the power network, the figure shows the receiver. The circuit is from a Radio Electronics from February 1989.
We found this circuit in an old publication on oscilloscopes. Its purpose is to observe the Ie /...
The sensors in this alarm are reed-switches. In the diagram we have only one, but several can be...
This circuit can be controlled by an external signal which allows its use as a shield. The circuit...