[R-390] FW: Line Level meter

[ka9egw at britewerkz.com]

www.jlmaudio.com the part number is VUBUF

the bare board is p/n VUBUFPCB

-----Original Message-----
From: Mike Sullivan [mailto:kc2kj at clear.net]
Sent: Wednesday, August 25, 2010 12:59 PM
To: ka9egw at britewerkz.com
Subject: Re: [R-390] Line Level meter


Where did you find the pcb?

Mike
kc2kj

----- Original Message -----
From: <ka9egw at britewerkz.com>
To: <r-390 at mailman.qth.net>
Sent: Wednesday, August 25, 2010 1:23 PM
Subject: Re: [R-390] Line Level meter


> OK, I found a pcb for six bucks which runs off a single positive rail
> supply
> [which I can tap from the filament or pilot lamp circuit] and uses a
> single
> TL071 op-amp and a handful of diodes and resistors, and presents a line
> load
> of aboout 100K or better.  Total board size looks be about an inch and a
> half square.  The complete kit is about twenty bucks.  Still cheaper than
> trying to source an original meter.  It's doable.
>
> 73, Brian KA9EGW
>
> -----Original Message-----
> From: r-390-bounces at mailman.qth.net
> [mailto:r-390-bounces at mailman.qth.net]On Behalf Of William A Kulze
> Sent: Wednesday, August 25, 2010 8:37 AM
> To: r-390 at mailman.qth.net
> Subject: Re: [R-390] Line Level meter
>
>
> For what it's worth, some years ago I stumbled upon an old VU meter from
> some other application and it worked just fine as a direct replacement. I
> didn't do any measurements, but it seemed to do just fine.
>
> Bill W2NVD
>
>
> Having solved the mystery of the 3rd wire...one of my sub-projects is
> figuring out the dropping resistor to use with a physically-correct 1mA
> meter movement [matches the 390 meters but it's just a 1mA DC meter, no
> internal rectifier/cap like a true VU meter] and a bridge rectifier to
> make
> a Line Level VU meter .
>
> Thanks,
> Brian KA9EGW
>
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