Using a tunnel diode, this circuit was found in a 1966 American publication. The circuit is for signals sampled at a speed of 8,000 sps.
I found this circuit in a 1986 English magazine. It can still be easily assembled, replacing the...
In short wave receivers or in the recovery of signals from scratched discs this circuit can be...
This very low consumption circuit can be powered by a solar cell. The time indication is given by a...