This circuit decodes a 1800 Hz tone used in communications. The circuit is from an American documentation for radio amateurs of the 80's. Equivalent component can be used.
Designed to operate with a video camera, this small transmitter was found in the February 1993...
This one-digit TTL modulus for 7-segment display can be parto f digital projects. Many of them can be...
The circuit shown below was obtained from the National Semiconductor Linear Applications Handbook...