This 4-tube amplifier with 6W of output was found in an American manual from 1947. The sound quality is excellent.
This circuit shown in the figure produces a pulse of constant duration at its output, of the order...
Silicon Labs CSP Package EFM32™ Leopard Gecko 32-Bit MCUs are part of the world's most energy...
This circuit was suggested by Philips in an old publication. The coils, made with wire 14 to 16...