Another of the many tachometer circuits we have on our site. This one is from the September 1976 Radio Elecronics magazine. The circuit is connected to the platinum contacts of a car or to a sensor.
This 3-channel transmitter for amateur analog TV from 902 to 908 MHz was found in a QST magazine...
The MC1455 integrated circuit consists of a version of the 555 made by Motorola. The circuit given...
The figure shows how to use the LM3900 to drain current from a load of up to 20 mA with the...