This circuit, found in 2002 documentation, triggers LEDs when a phone call is received. The LEDs will flash alternately in these conditions. Common LEDs are used in this circuit.
This very low voltage regulator for 3 V input (2 batteries) was obtained in a documentation from...
This circuit consists of an adapter that allows the reading of low currents at various scales. A...
This circuit generates signals that can be adjusted in a small range around the frequency of the...