This circuit uses a general-purpose transistor and has waveform adjustment. We found it in an American documentation from the 90s.
This overtone oscillator can generate signals up to 150 MHz. The crystal determines the frequency and...
The circuit shown by the figure below can produce signals in the range between 20 kHz and 30 kHz....
This circuit is used to convert audio signals from na amplifier into infrared modulated signals....