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=== graphic analyzer & vu-meters ===
=== graphic analyzer & vu-meters ===
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Old 4th April 2007, 10:23 PM   #21
cpemma is offline cpemma  United Kingdom
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Join Date: Jul 2003
Location: S Yorkshire OK
The multiplexing method also appeared in ETI magazine, basics was like this.
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Old 4th April 2007, 11:05 PM   #22
cpemma is offline cpemma  United Kingdom
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Join Date: Jul 2003
Location: S Yorkshire OK
Vellemann also did a kit K4300 many years ago, the U2067B bargraph chip used is long obsolete AFAIK, but I think the LM391x would fit.

Some info on the circuit and a parts list.
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