We found this circuit in a 1973 documentation. The null adjustment trimpot is 10k. The circuit can be powered by symmetrical sources from 9 V. The diodes on the bridge can be 1N4148.
This circuit is suggested by Texas Instruments' Linear Circuits Applications. It consists of an...
Radio Electronics magazine in November 1962 published in an article several circuits with tunnel...
This circuit generates a signal corresponding to the harmonic of the crystal used. The frequency is...