We found this frequency meter circuit in a 1974 documentation. The circuit is powered by 12 V and has 8 digits. Changes can be made using a prescaler to reach higher frequencies.
I found this circuit in an Electronics Handbook from 1989. The circuit can be assembled with a...
The TDA2613 is the mono version of the TDA1521A and has pinouts compatible with an integrated...
This sound effect circuit uses only one integrated. We found it in a 90's EDN. The effects can be...