Speed game for 3 competitors (CB20958E)

We found this circuit in a Popular Electronics from the 80s. It is a game of reaction speed for 3 competitors. Indicator LEDs are used.

| Clique na imagem para ampliar |

Precision Limiter (CB15883E)
The circuit in the figure is based on an LM101A; diodes can be replaced with equivalents. The...
Transistorized tachometer (CB9355E)
This circuit, with magnetic sensor, uses an operational amplifier of the time. The circuit is from...
Remote control analyzer (CB7812E)
Found in a 90s Popular Electronics, this circuit checks if a remote-control transmitter is...