This crystal oscillator is indicated for the calibration of IF steps of common radio receivers. The transistor admits equivalent as 2N2222 or BF494. The circuit is from an old American publication.
In this oscillator circuit using 3 TTL inverters we have all the conditions for the frequency...
This circuit was found in Japanese documentation from the 1960s. The coil must be 4 mH and the...
The circuit in the figure uses two of the 4001's four gates to trigger a relay in a timed manner. The...