Operating in the range of 3 to 100 MHz, this circuit was found in documentation from the 70s. Observe the coil. The field effect transistor is a component of the era.
This circuit, obtained from ancient English documentation, produces a pulse every 24 hours when a 50...
This digital pulse counter offers an LED indication. Its maximum frequency is of the order of 5...
This circuit was found in an old RF documentation. The circuit cuts out the incoming sinusoidal...