Shield TTL (CB19761E)

This circuit is from 80's documentation. Operational equivalents can be used. The power source is 5 V TTL.

| Clique na imagem para ampliar |

Power Control (Dimmer) (CB435E)
In the original circuit a 40431 quadrac is used, but this is not a common component today....
Limit Comparator (CB5084E)
This circuit, which appears in this section elsewhere, is from an American 1980s documentation....
555 Biofeedback Monitor (CB24775E)
This simple 555 biofeedback circuit was found in the December 1983 issue of Radio Electronics...