Modulator Amplifier (V1574E)

This circuit is from a 1938 tube manual. Transformers are the critical components. Component values are given.

Digital resistance control (CB7551E)
This circuit simulates a resistor controlled by digital signals. We found it in American...
IR Remote Control Test (CB12297E)
We found this circuit in a 1978 publication. It is possible to detect the emission of infrared in remote...
AD Converter for Current Monitor (CB5246E)
Found in a 2005 Linear Technology application manual, this circuit provides outputs from a current...