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.
This circuit converts a positive voltage to negative, with maximum output current of the order of...
This one-digit photometer using CMOS circuits was found in a 1989 documentation. The circuit is...
The frequency of this circuit is approximately 1 Hz. Whenever the output is at low level, the LED...