This high impedance step suggested by an English publication can operate up to 1 MHz with 1 V rms output. Input impedance is 1 M ohm.
September 2016 - Mouser Electronics is providing new ultraviolet LEDs VLMU1610 of Vishay suitable...
The frequency of this circuit is approximately 1 Hz. Whenever the output is at low level, the LED...
This circuit triggers a remote doorbell when the phone rings. The circuit is for the 110 V mains...