[sdiy] IN-13 Bargraph VU Meter

[Terry Bowman]

> On Feb 28, 2026, at 12:57 PM, Oren Leavitt via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> Cool!
> That looks tempting to me. I have a couple of those THAT4301 analog 
> engines that I bought some years ago. I was originally intending to 
> build a vocoder around THAT4301s but the chips were discontinued.


What I’d like to have is a simple IN-9/IN-13 driver board that has a CV input and a level knob. Simple. All of the designs I’ve seen are part of a more complex circuit that I’m not about to try to modify. If anyone wants to do it for me I won’t complain. 

I have a small pile of both kinds of tubes that I acquired before that prices went crazy. Sadly, I don’t have the purple IN-9s filled with argon.


Terry Bowman, KA4HJH
"The Mac Doctor"

https://www.astarcloseup.com

"Every kid starts out as a natural-born scientist, and then we beat it out of them. A few trickle through the system with their wonder and enthusiasm for science intact."—Carl Sagan, Psychology Today, 1996

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