Who is the fast (CB9809E)

This simple TTL circuit indicates which was the first to press one of the four pressure switches. The circuit must be powered with a voltage of 5 V.

| Clique na imagem para ampliar |

2-Transistor MW Radio (CB18309E)
This commercial circuit is from a Japanese magazine from 1967. It uses germanium transistors, and...
Hybrid Mixer (CB4920E)
We found this configuration in an American 80's documentation. The circuit can be implemented with an...
Negative ion detector (CB21001E)
This tube circuit was found in the magazine 73 for radio amateurs in an issue from the 1980s. Note...