The circuit is from the Linear applications Handbook of the National Semiconductor of 1994. The components used are not common today.
The A3906 integrated circuit from Allegro MicroSystems (www.allegro.com) consists of a single-step motor...
This circuit is used to connect an additional capacitor to a tuned circuit of a VFO. The circuit...
This touch sensor, found in an American documentation on transistors, has gained 8 million times...