Thumping level meters that pump with the volume are a great example ... The build relies on a very simple circuit that relies entirely on analog electronics in lieu of the usual digital signal ...

The circuit uses a preamplifier stage around NPN transistor BC 548 and a power amplifier around LM380.An external Collar MIC can be given to the input using an audio jack .The voice signals are ...

Some classic circuits are still going after many decades ... The main purpose for having a VU (volume unit) meter is to monitor audio signal levels but a conventional VU meter responds only to the ...

Volume unit (VU) meters are cool — it ... and how to hook them up to create a two-channel stereo VU meter. The final circuit largely relies on a transistor, a diode, some passive components ...