Found in a 1965 Electronic Design, this circuit limits surges in a load when power is applied. The diodes and SCR must be according to the load.
This powerful amplifier was part of commercial sound circuits from the 90s. The integrated circuit...
This circuit generates a control tone that serves to adjust amplifiers, check audio cables. The...
This circuit locks when the sensors are opened. The relay can be 6 or 12 V depending on the power...