This is a combined circuit of tone generator and preamplifier. We found it in a 1975 documentation. Operational amplifiers of that time can be replaced by modern equivalents.
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...