This 10 A solid state relay was found in a 1980s documentation. It can work as a shield and implemented with modern equivalent transistors.
The resistor of this circuit has typical values between 470 ohms and 2k2. We found this circuit in a...
This micro AM radio will tune strong stations in the frequency range between 530 and 1,600 kHz....
We found this circuit in a 90's Popular Electronics. The circuit produces a loud sound if S2 is...