This circuit converts BCD inputs to analog voltages. The operational amplifier must be powered according to the desired output voltage range. The circuit is from documentation from the 90s.
The sensor for this Intersil circuit (1983 databook) is a common silicon transistor. The trimpot...
This circuit is from a 1980 publication. The circuit has high gain with weak signals and lower gain...
The integrated circuit used in this 1987 project is not very common these days. However, if found...