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 was found in a 1967 Electronics World. Transistor Q1 can be a TIP321 and Q2 can be a...
This circuit was obtained from ancient American documentation based on the application of neon...
Placed near a common receiver, this oscillator is intended to generate a beating signal to receive...