Despite being from a 1969 publication, the transistors used have current equivalents such as BC548 and BC558. The circuit generates signals from 1 500 to 20 000 Hz and 4 scales.
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...