This is a classic FM amplifier IF amplification stage configuration. The circuit is from a 1980s documentation. CN is the neutralizing capacitor.
This simple alarm using only transistors was found in a 1990 publication. It can be powered by D...
This oscillator uses a crystal to set the frequency. The operating limit of the unijunction is in...
This oscillator was found in the January 1996 issue of Electronics Now magazine. The frequency is given by...