This circuit found in a 1964 US publication reverses the signal level by providing 9 to 0 V outputs from 0 to 9 V signals. Transistors may be equivalent.
Suggested by General Electric in an old documentation, this circuit can use modern SCRs and the...
The frequency of this oscillator depends on T, which for the audio band can be a common output...
This circuit has a common configuration widely used in projects on this site. The transistor is...