These optical relays, which can act as a shield, were found in an American documentation from the 1980s. The circuit has a LDR sensor. It can be adapted for other types of sensors.
Using a CA3130, we found this circuit in an English publication from 1977. The circuit must use a...
We found this circuit in a 1980 documentation. The flasher uses 3 transistors in the configuration of an...
This circuit was found in General Electric's 1965 documentation. It appears elsewhere on the site....