This very low current circuit was found in the April 1995 Electronics Now magazine. The frequency should be chosen for maximum efficiency according to the small transformer used.
This 80's circuit uses a light-sensitive SCR or LASCR and a one-sided silicon switch SUS, uncommon...
Twin-T oscillators can be used to produce sinusoidal signals in the audio track with good...
This “people detector” with pyroelectric sensor was found in the April 1991 issue of Radio...