This variable gain circuit for analog video signals was found in a 90s Linear Technology documentation. The circuit has an adjustable gain between -12 and +8 dB.
This National Semiconductor circuit appears elsewhere on this site. The circuit must be powered by...
In this circuit the frequency is determined by the coil and the variable capacitor. Transistors like the...
This circuit is from old American documentation, but the transistor used is still very common...