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.
We found this project in a 1982 publication. What we have here is an audio signal relay trigger, which...
We found this circuit in an old French documentation from the 70s, but it can be assembled using...
We found this circuit in an application note from Linear Technology of the 90s. The circuit uses...