A demonstration of the VU meter driver board discussed in the previous video.
Driver board design analysis here: https://youtu.be/6WDvXofWE8k
The VU meter is from eBay seller 'jims_audio', listed as "VU meter huge size + warm back light for recording !" - link here: http://www.ebay.com/itm/VU-meter-huge-size-warm-back-light-for-recording-/321236001999
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DIY mic preamp - VU meter driver demonstration | NatokHD