This circuit was found in an American publication from 1965. The circuit uses components from that time. No information was given about the excitation transformer. Observe the high input power.
Other series amplifiers such as the MC3301, MC3401 and LM2900 can be used on this circuit. We...
The division by eight using the 4018 is made as shown here. It isn't necessary to use additional...
We found this circuit in a Popular Electronics of the 90s. The circuit still uses light bulbs, but...