Found in American documentation from the 1980s, this circuit makes use of components of the time, which are uncommon today. The circuit detects the approach using a sensor formed by metal plates.
This circuit can supply voltages from 0 to 12 V with currents up to about 5 A, with the adjustment made...
This circuit is from the 80s. The integrated circuit used is uncommon as is the transducer....
This power supply is indicated to power small loads up to 30 mA. The original output voltage is 6...