This 1950s audio amplifier uses output tubes of type 1625 in its output stage. The Class B circuit provides a few watts of power and uses transformers that are not readily available today.
Up to some minutes intervals can be obtained from this circuit. The circuit can use a lamp (or...
A four-bit analog-to-digital converter [A/ D or ADC] can be built using one 4066. An 8-bit...
This is a VU-meter bargraph with up to 7 LEDs according the Power supply voltage. Adjusts are made by...