We found this frequency meter circuit in a 1974 documentation. The circuit is powered by 12 V and has 8 digits. Changes can be made using a prescaler to reach higher frequencies.
Using the HA2400 this circuit has its output voltage digitally programmed from the references...
Assembled with SMD components this circuit can be very small. The range is a few tens of meters. We...
This circuit can be used as a shield when its supply is 5 V. in this case we can exchange the...