Found in a Popular Electronics from the 90s, this shield is activated by a 20 mA current. The inverter is an Open Collector TTL type. The power is 5 V.
E) This circuit was found in documentation from the 1980s. The integrated circuit used is not very...
The circuit shown in the figure makes it possible to trigger a load after times that can extend up to 4...
This circuit with operational amplifier was found in old American documentation. It can be...