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.
This circuit was obtained from a 1994 publication. Its purpose is to digitally switch 5 audio...
The circuit shown is from the National Semiconductor's Linear Applications Handbook. The CI is not...
In this charger, the charging current is basically limited by the LEDs. The transformer is a low...