This power control for powers up to about 10 W uses wire potentiometers in an arrangement that allows to maintain the impedance. The circuit is from old European documentation.
This is another sampling and holding circuit found in a factory manual from the 1980s. The circuit...
This charger was found in an old Motorola manual using an SCR from this company, which, however, can...
Twin-T oscillator are designed to produce sine low frequency signals. These oscillator are...