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 old documentation but can be applied to modern equivalent components. The...
This powerful FM transmitter was found in 1992 documentation. The circuit requires a 12 V source...
We found this circuit in an old documentation. Transistor can be BC548 and relay according to...