This circuit generates signals for adjustments in FIs of 10.7 MHz. The transistors can be BC548 or equivalent. We found this configuration in a documentation from the 70s.
This circuit can measure frequencies up to just over 1 MHz and uses CMOS technology. The circuit is...
This circuit, found in 2002 documentation, generates a strong audio tone when the light in the...
The integrated circuit used in this 80's application is not common today. However, modern...