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.
This project was found in a 1982 documentation. Super-regenerative receivers can combine great...
We found this circuit in a 1977 technical documentation. The circuit can use a TIP31 for Q1 and a...
This high frequency modulator was found in Motorola's 1990 Linear Databook. The current depends on the...