Suggested for the control of photographic enlargers, this 1967 General Electric circuit uses still common components. The circuit directly controls a lamp for exposing negatives.
Found in a 2005 Linear Technology application manual, this circuit provides 12-bit resolution output...
This amplifier, obtained in an Argentinian publication of the 1970s, provides a 6 W output. The...
This circuit was obtained from an American 80's documentation. The operational ones can be...