This circuit is used to detect PLL signals from the 4046 IC. The circuit is from an Electronics Now from October 1994. The indication is made through LEDs.
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...