Found in old American documentation, this circuit can use crystals between 27.5 and 33 MHz operating on the third harmonic. The transistor admits equivalent.
This frequency divider by 10 uses discrete components only. Modern equivalent components can be used as...
Found in an article in the August 1971 Radio Electronics magazine, this circuit supports sensitive...
We found this circuit in a 1972 RCA technical documentation. The comparator can be any type and C1...