This circuit operates with frequencies from 0.5 to 400 MHz. We find it in a 90’s NASA documentation. The transistors are from that time.
This circuit was obtained in 1974. It serves to indicate the tuning of stations on a common...
This circuit is from 2005 Linear Technology documentation. The circuit applies to 12 V systems and...
Suggested by the National Semiconductor in 1980s documentation, this circuit uses components from the...