This OF-1 LO oscillator was found in a 1980s American documentation. The transistor can be any general-purpose and C1 / C2 are determined by the frequency.
Found in Burr Brown documentation from the 90s, this circuit applies to several operational ones....
Incredibly, a 78XX type voltage regulator can be used to amplify low frequency (audio) signals in the...
This is the basic receiver for the CIR12025 that consists of the transmitter. The circuit is...