This circuit was obtained in a 90s American documentation. The integrated circuit used is uncommon today. The circuit has a low RFI level.
This circuit is from a 1998 Poptronics. The circuit triggers a buzzer after a certain time, waking...
This capacimeter was obtained in European documentation from the 1980s. The indicator instrument, a...
Found in English documentation from the 1990s, this circuit can employ equivalent components. The...