Found in American documentation from the 90s, this circuit can measure frequencies on a linear scale from 0 to 1 kHz. The components can be changed to measure other ranges.
This interesting digital counter with relays with complementary outputs was found in the Radio...
The idea of this circuit is that when the device in SO1 is turned on, the device connected to...
This interesting circuit allows to obtain symmetrical voltages from a simple battery. Among its...