We found this circuit in the June 1987 issue of Radio Electronics magazine. With it, it is possible to receive signals from the bands determined by the crystals in a common medium wave receiver.
This circuit is based on the Texas Instruments LMC662 and has the function of monitoring the audio...
Yes, tunnel diodes can also be used in voltage regulators, as shown in this circuit from a Radio...
Based on operational amplifiers of the time, this circuit from the 1980s has high input impedance. The...