This circuit was found in an American documentation from the 80's. The components are from that time. It provides a variable output of 18 to 30 V with a current of 200 mA.
This circuit uses a FET to drive an LED with constante currente. The current up to 20 mA can be...
This circuit was found in a 1999 publication. Its purpose is to flash two LEDs according to the...
With this voltmeter with high input resistance, voltages from 10 mV to 50 V. can be measured. FETs...