We found this circuit in the Linear Applications Handbook by National Semiconductor. It uses the LM3900, an operational transconductance amplifier as a base. Q1 can be a 2N2222 or similar.
This grid-dip meter was found in a 1956 documentation from Sylvania. It can be implemented with...
This circuit was found in the November 1992 issue of Radio Electronics magazine. The circuit has...
This circuit of old American documentation (1965) can be applied to any transistor. | Clique na...