We found this 6-tube amplifier in a 1947 publication. It is a Public Address amplifier with excellent performance using triodes on the output.
This is a circuit widely used in power controls. When the alternating supply voltage goes through...
With a NAND trigger we can achieve pulse delay for digital applications in a relatively simple way,...
This circuit excites an LED, which will flash at a frequency adjusted by the trimpot. The other...