This circuit was found in old documentation, but the setting applies to any operational. Resistors and capacitors determine the frequency. For the indicated values the frequency is 10 kHz.
This is a 5 V power supply from 2002 documentation, suitable for walkmans and diskmans, common at the...
This circuit, from 2001 documentation, uses a phototransistor as a sensor and an operational...
This two-channel bargraph meter uses a single KAA2281 integrated circuit. Found in the January 1991...