This sound effect circuit is from a Radio Electronics magazine from December 1969. The transistors support equivalents and the power is provided by a battery to reduce the possibility of noise.
We found this 5-digit circuit in a 1990 publication. The displays are of a common cathode and the...
This circuit was taken from old American documentation. The circuit provides pulses obtained from...
The integrated circuit used in this application is like the 555. The components depend on the...