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Messages - madbean

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1
Open Discussion / NABD
« on: January 20, 2021, 01:21:19 PM »
New acoustic baritone day. I've wanted a bari acoustic for a long time and found a pretty good deal on this used Alvarez. It's got an LR Baggs pickup system in it, too.

Out of the box, the setup was okay but the strings were grody. I put on the new strings but then the setup went pretty out of whack (they are a heavier gauge it seems). So, I've been working on that for a couple of days. Filed the nut slots a bit, took out a lot of relief in a few passes over several hours. String action is sitting at 8/64th to 6/64th B to B which is still too high, so I think the saddle will need to be lowered. But, with each adjustment the playability and even tone is improving. Overall a decent deal for the money spent. And, it is very fun to play. Old familiars sound new and interesting when you are tuned down a 4th!

Long term I may end up finding a lighter gauge string for it. I could see over a few years the bridge possibly lifting due to the enormous string tension. Maybe a humidifier for it would help - I've never used or had one.

PS - scale length is a bit over 27" which is actually shorter than my bari electric. Not a hard adjustment to make with playing.


2
VFE Projects / Re: Noisy VFe Focus Build
« on: January 18, 2021, 11:02:11 AM »
Have you tried turning the makeup gain trimmer all the way down? This could help in reducing noise. My guess is the active filter stages is where it's coming from. If you turn the Mix knob all the way CCW does the hiss go away?

3
Build Reports / Re: Memory Lane Delay
« on: January 16, 2021, 03:47:02 PM »
That's really killer, good work!
I was thinking a bit about the Dirtbaby again after seeing jjjimi84's entry in the contest. One thought I had was re-doing the DB but with an FV-1 instead of the PT2399. More delay, less noise. Maybe have the Fv-1 handle the modulation to reduce part count. Anyway, I'm impressed you got all that in a 125B!

4
Global Annoucements / Bass Series is out
« on: January 16, 2021, 01:28:28 PM »
The Bass Series has launched and is now available in the Store.
BoomBoom - Brassmaster
Junk Trunk - Chunk System Agent 00Funk
Gas Tank - Chunk Systems Brown Dog
Edgelord - Ibanez SB-7
Also, the "2020" version of the Rangemaster is out. That completes all the updates for the 1590A project which I started at the beginning of last year.

- I'll have a youTube demo available in a couple of days. You can find good demos of the original units there as well.


5
General Questions / Re: Red Llama Squeal
« on: January 15, 2021, 09:00:30 AM »
MLCC can be microphonic so maybe. But the squeal going away only in the middle of the range is pretty bizzare. Possibly the issue is in the breadboard itself. Or maybe the pots need contact cleaner.

6
General Questions / Re: Red Llama Squeal
« on: January 15, 2021, 08:33:08 AM »
It's a pretty high gain circuit so squeal on a breadboard is a possibility. But, you should not have any at lower gain settings.

7
Build Reports / Re: A bit of a fuzzy start to the year...
« on: January 14, 2021, 08:57:39 PM »
Champion, d00d. Seriously, these are tight frigging builds.

8
Open Discussion / Re: Transporters have been invented!
« on: January 14, 2021, 06:04:22 PM »
I had a customer just recently that showed his package delivered about 5 days before it actually was. USPS is a bit of a mess now. I think it will get back to normal operation soon.

9
Tech Help - Projects Page / Re: Zener not measuring at rated voltage
« on: January 14, 2021, 04:25:43 PM »
I did at some point but I don't remember the reading. It was not correct near 4.3v. (Edit: it's 0.7v)

Measured for forward bias, you should read b/w .5-.8v on a silicon diode like the zener, if I've read your testing method correctly.

How I understand it in the Tractor Beam: the zener is there to prevent the bias voltage on the FET gates from swinging too far to the negative end of the rail, with optimal bias being within a volt or two of 0v (since it's a split rail design). I don't think the Zener diode value is that critical here - only that it clamps the voltage in a predictable way to give that result.

Your testing method included putting a 10k resistor in series with the 4.3v zener and you got about -2.6v. So, I did the same test (just with everything in reverse for +9) and got basically the same reading on a 4.3v Zener. With 100R instead of 10k, I got 4.13v. So, I think your Zener is fine. It's even a little more complicated in the TB circuit since you also have basically a 250k resistor in parallel with the Zener (200k trimmer + 47k resistor).

10
Maybe just pulling too much current. Try a 1/2W rather than 1/4W. You could probably sub 10R in place of 12R as well.

11
Global Annoucements / Re: Last day for BOTY submissions
« on: January 13, 2021, 07:44:59 PM »
We'll get the voting started tomorrow. Thanks for your patience everyone!

PS: Most of the new project docs are up.

12
Open Discussion / Re: Non Polar Electrolytic Caps Ok for AquaBaby ?
« on: January 11, 2021, 08:29:44 PM »
Sure, that's not a problem.

13
Global Annoucements / Re: Last day for BOTY submissions
« on: January 11, 2021, 11:54:01 AM »
Excellent group of entries. I am finishing up documentation for the next release right now but I plan to go through everything and get voting started within a day or so.

14
Tech Help - Projects Page / Re: White Horse version confusion
« on: January 11, 2021, 11:36:05 AM »
Yeah I can see your confusion. The boards I originally got from him were the 4.2v but the documentation he provided on it listed those caps as 10uF. I suspect they were originally 1uF film caps when he was building v4.2 and later changed.

Anyway, the 10uF linked in the doc are the right ones to use. You can ignore the polarity indicator on both the board and schematic. He may not have had a bi-polar package drawing when he did the board way back when.

15
Open Discussion / Re: mn3207 in place of mn3007
« on: January 10, 2021, 06:19:55 PM »
In certain cases you can change designs for the different BBD technologies. In single supply designs, this is usually just a matter of switching power and ground in a couple key places. You can also flip positive ground designs to negative in a similar way to use the 32xx in place of the 30xx chips. The Rusbucket is a bi-polar supply design it's just not going to be straight forward to do a similar conversion, IMO. Maybe it's not impossible, but when you factor in the time it would take to figure it out you're better off just spending a few more dollars and using the correct chip. I could see it maybe being worth the effort for a commercial or production version but not for this particular circumstance.

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