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, which can be found elsewhere on this website, uses a 741 operational amplifier and a...
This circuit can act as a receiver for the transmitter of the previous circuit. We found it in...
This circuit makes use of an unusual component which is a large surface diode that can be used to...