This circuit is better than the previous one in that the control is isolated by a transformer. The transformer has 110 or 220 V primary and 6.3 to 12 V secondary with 200 to 500 mA current.
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....