This circuit is from an old Japanese publication of 1962. The circuit uses two batteries, one for the filaments of the tubes and the other one of high voltage for the plate circuits.
This circuit is from an August 1984 Radio Electronics magazine. It monitors the state of a RAM...
Datasheet of This amplifier uses a pair of complementary transistors at the output and can provide 1 W of...
For counting to values higher than 16, many 4520 can be cascaded as shown in Figure . The EN...