This old circuit, from the 80s, was found in American documentation. The circuit uses dual gate FETs (MOSFETs) and has no data on the coils used.
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...