This circuit was found in Motorola's Linear Interface ICs of 1993. The integrated circuit used is not common and the load current depends on the Triac.
The scratching noise is quite unpleasant for those who pass the sound of vinyl records to other...
This circuit for common analog telephones was found in March 1982 Radio Electronics magazine. It...
In the figure we have an RF amplifier for tunnel diode. The frequency range will depend on the...