We found this circuit in an American documentation from the 80s. The integrated circuits are operational amplifiers of the time. We can test modern comparators like the LM339.
This simple bridge circuit can be used for impedance or resistance measurement using a high...
This circuit is suggested by Texas Instruments and with the component values we have a cutoff...
The first integrated circuit of this receiver, a PLL from the 90s, is no longer easily found on...