This is a typical point scale or moving bar circuit with the LM3915. We found it in old American documentation. The operational amplifier supports an equivalent modern type.
This circuit is from the time when photos were revealed in darkrooms. We found it in a 1968...
This high-gain circuit was found in an American publication from the 1990s. The circuit can use...
This circuit provides an output of 5 to 10 V at its output from inputs of 1.5 to 4.5 V. The output...