Found in a 1990 PE Hobbyst, this 4-digit circuit has a high response speed. The circuit is based on TTL logic.
This simple metronome, from 1985 documentation uses only transistors and has two settings. For...
The frequency produced by this oscillator depends on the temperatire sensed by a thermistor. The...
We found this circuit in a 1986 publication. However, as it is based entirely on 555 integrated...