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2026-02-28 by Thomas Hudson
All your suggestions were awesome. I’m buying this only to duplicate it. The Soniceware Liven Ambient 0. Four layers; drone, pads, atmosphere, and noise. I love this: Grand River (Aimée Portioli) – Ambient Live Set @ Superbooth 2025 youtube.com
2026-02-27 by drheqx
Tom, I'm interested. What are you looking to get for one. Mike B 631-948-6352 On Thu, Feb 26, 2026 at 9:21 PM Tom Arnold xyzzy@sysabend.org > wrote: Yeah, I've been kinda quiet for a while. Anyway, I'm cleaning and I keep coming across a couple TB3030 boards along with their asso
2026-02-27 by Tom Arnold
Yeah, I've been kinda quiet for a while. Anyway, I'm cleaning and I keep coming across a couple TB3030 boards along with their associated MIDI interfaces. I bought these partially assembled way too long ago and have never done anything with them and I'm thinking its time they go
2026-02-26 by Thomas Hudson
Apologies if this has been posted before, but this seems like a fun project. Video: DIY Minimoog Inspired Synth | A Teensy Powered Tribute youtube.com GitHub: https://github.com/NickCulbertson/Min...
2026-02-26 by H.Sergio Alves
Worked with Barco Indoor and outdoor led panels (iLite, Olite, MiTrix) and although they were calibrated at factory we had to perform colour correction and calibration specifically when in tv studios… tv producers and photography directors inform us of their colour temperature, h
2026-02-26 by brianw
Interesting. Is the Forward Voltage drop the only thing that affects color in LEDs? Also, how long does it take for the Vf to change, and does it vary that much between components in the same batch? The advertisement mentions drift, which implies a long-term adjustment to keep in
2026-02-26 by drheqx
Hi All, If you are designing a system with LEDs as ambient lighting this device might offer a good solution to control color drift over time. The concept is very good and I am sure there are other ways to do this, but in the case of things like illuminated pads color drift and va
2026-02-23 by Gordonjcp
On Mon, Feb 23, 2026 at 01:40:02AM +0000, grant musictechnologiesgroup.com wrote: > Shades of the Drumulator "p00F" fix. 1983 -> 1994 > I remember reading that in the service manual a year or two back and thinking "yeah I don't think you should maybe do a poof routine on stage an
2026-02-23 by grant musictechnologiesgroup.com
Shades of the Drumulator "p00F" fix. 1983 -> 1994 On 2/22/2026 12:05 PM, Thomas Hudson via Synth-diy wrote: Wow. I can’t thank you enough. That fixed it. I’m surprised that site didn’t come up in any of my searches. This is one piece of gear I’ll never let go of. They don’t go up
2026-02-22 by Thomas Hudson
Wow. I can’t thank you enough. That fixed it. I’m surprised that site didn’t come up in any of my searches. This is one piece of gear I’ll never let go of. They don’t go up for sale very often, and when they do the prices are outrageous. Again, thank you, Thomas > On Feb 22, 2026
2026-02-22 by Thomas Hudson
First off, thanks for all the drone suggestions, I’m having fun looking at all the possibilities. This may be off topic, but I have an E-mu Ultraproteus that powers up, but the screen is blank. I replaced the internal lithium battery but that didn’t help. Just wondering if anyone
2026-02-20 by Michael E Caloroso
Also make sure that the earth on the line voltage is NOT directly connected to any of the secondaries. Your schematic shows four secondary windings and none of the coil wires will be the same potential as earth, which will cause excess current flow when directly coupled. MC On Fr
2026-02-20 by jpdesroc@oricom.ca
There are wire links that set the correct AMERICA 120v voltages on the same PCB. These links are placed correctly. De : Synth-diy De la part de grant musictechnologiesgroup.com Envoyé : 19 février 2026 22:11 À : synth-diy@synth-diy.org Objet : Re: [sdiy] Questioning on why both o
2026-02-20 by jpdesroc@oricom.ca
No. The transformer is soldered on a PCB so no way to change the primaries polarities. De : Mike Bryant Envoyé : 19 février 2026 21:07 À : synth-diy@synth-diy.org; jpdesroc@oricom.ca Objet : Re: [sdiy] Questioning on why both of this power transformer primary windings went almost
2026-02-20 by jslee
Apologies, I meant this one https://www.nonlinearcircuits.com/modules/p/divine-cmos Tired On Fri, 20 Feb 2026, at 10:06, jslee via Synth-diy wrote: Hi, On Sun, 15 Feb 2026, at 11:24, Thomas Hudson via Synth-diy wrote: I’m looking for drone synth ideas, whether fully analog or ver
2026-02-20 by H.Sergio Alves
Check Erik’s Planet drone using super collider on Pi. Also check the Toil Modular drone modules mainly the continuum and the ghost in the machine. :) On Thu, 19 Feb 2026 at 23:11, jslee via Synth-diy synth-diy@synth-diy.org > wrote: Hi, On Sun, 15 Feb 2026, at 11:24, Thomas Hudso
2026-02-20 by Roman Sowa
If not loaded transformer takes 1A on primary, and supposedly this is not a 5kVA transformer, there must be short between secondary windings. All it takes is one winding shorted. It will not affect output voltage, and there's no easy way to measure it at all. If it takes 1A idle
2026-02-20 by Richie Burnett
Sounds like a short circuit somewhere inside the transformer. Very hard to find as it only takes a single shorted turn to make the off-load primary current go high and the transformer to quickly overheat (usually causing more insulation to melt and more shorted turns!) It could h
2026-02-20 by Paul Perry
If one winding is taking too much current due to a short, I expect the other (unshorted) winding would also draw excess current when energised, due to coupling through the core. You could test this hypothesis by measuring the resistance of each of the primary windings. paul perry
2026-02-20 by grant musictechnologiesgroup.com
I repaired a Garnet amp that blew its transformer when the generator it was hooked up to had been set for way too high a voltage (I don't remember what the customer said the voltage was, but they admitted the festival was smokier than originally planned). I think that was all tha
2026-02-20 by Mike Bryant
Pure guess but has somebody already replaced the transformer once, and has JUST ONE of the primary windings reversed ? This would mean they would fight one another, and with larger fuses happily overheat and melt the insulation of the windings. From: Synth-diy on behalf of Jean-P
2026-02-20 by jpdesroc@oricom.ca
A customer brought me a guitar preamp that he said ‘blows its internal fuses..’ I checked the internals and found that both of the internal 315mA primary windings fuses were blown (F2 & F3). The main 500mA fuse (F1) was ok. So I connected my variac to only one of the primary wind
2026-02-19 by jslee
Hi, On Sun, 15 Feb 2026, at 11:24, Thomas Hudson via Synth-diy wrote: I’m looking for drone synth ideas, whether fully analog or very hands on controllers for something running on a Raspberry Pi, like Super Collider, Sonic Pi, or ChucK. Just looking for ideas to get started there
2026-02-17 by Oren Leavitt
With the power off, did you do visual inspection and continuity check on connections and PCBs? Cracked PCB traces or loose solder joints are common problems in vintage gear. With power on, is there: Mains AC at the transformer primary? Low voltage AC at the transformer secondary?
2026-02-17 by Todd Sines
Finally, getting around to getting this thing fixed. #1: power supply. No +/-15V voltage. Recapped the entire supply, no voltage. Then I tried to replace the Roland 022-86C (100-120V) transformer with a Triad Magnetics toroidal transformer that delivers +/-15V, still nothing. Won
2026-02-16 by Spiros Makris
Hello List, I just came across this neat book by Ken Wessen in a teensy focused group. A very nice writeup of what the fundamental blocks of subtractive synthesis are on a functional and mathematical level, as well as breadboard projects, complete programs etc. Quite amazing stuf
2026-02-15 by Thomas Hudson
I’m looking for drone synth ideas, whether fully analog or very hands on controllers for something running on a Raspberry Pi, like Super Collider, Sonic Pi, or ChucK. Just looking for ideas to get started. This interesting: Hexaphon - Six Voice Analog Synth - Etsy etsy.com But I
2026-02-05 by Adam (synthDIY)
> On 5 Feb 2026, at 10:20, rburnett@richieburnett.co.uk wrote: > > To be honest when I got the SH-09 working as a young lad I was blown away... It was the first "keyboard" I heard that made sounds like the music I was listening to in my youth. Been hooked ever since! I know exact
2026-02-05 by rburnett@richieburnett.co.uk
No this is not how Roland's SH-09 synth was meant to sound... My SH-09 had various bits missing when I was given it. There's more info here: http://synth-diy.org/pipermail/synth-diy/2025-September/175724.html I just made a little PCB to replace the unobtainable sub-oscillator div
2026-02-04 by Adam (synthDIY)
> On 5 Feb 2026, at 06:59, Richie Burnett wrote: > > TL071 op-amp dropped straight into the SH-09 and it works a treat. One minute after releasing a note the pitch now only drops by about 15 cents. Not bad for an analogue sample & hold. > > I also fixed the issue with the improvi
2026-02-04 by Richie Burnett
TL071 op-amp dropped straight into the SH-09 and it works a treat. One minute after releasing a note the pitch now only drops by about 15 cents. Not bad for an analogue sample & hold. I also fixed the issue with the improvised sub-oscillator divider triggering on the wrong edge o
2026-02-04 by Raf Wlodarczyk
I used the "Orphan Programmer". Not many devices will program parts with -41V :) This will be a read only situation, the PROM isnt written to when in use > On 01/27/2026 2:53 PM EST grant musictechnologiesgroup.com wrote: > > > What did you use for a programmer!? That's a pretty
2026-02-01 by Mattias Rickardsson
Ingo Debus via Synth-diy synth-diy@synth-diy.org > : S Ridley via Synth-diy synth-diy@synth-diy.org >: So, probably legally safe, but still cr4p. I have yet to see a (commercial grade) SMPS without any y-capacitor. The standard MacBook touch buzz, I presume. Is there a way to des
2026-02-01 by Ingo Debus
Am 01.02.2026 um 12:53 schrieb S Ridley via Synth-diy : So, probably legally safe, but still cr4p. I have yet to see a (commercial grade) SMPS without any y-capacitor. Ingo
2026-02-01 by H.Sergio Alves
Thanks for your words Benjamin! I’ve now added reverb to the project using the free verb library and controls for room size and mix, also added a sample start and end point adjustment using encoders. I’ll update the GitHub soon :-) On Thu, 29 Jan 2026 at 13:05, Benjamin Tremblay
2026-02-01 by Richie Burnett
Thanks for all the tips and suggestions guys. I de-soldered the TO-99 LF13741 and tacked a trusty junkbox 741 in it's place just to test, (as I don't have a TL071 at hand.) Everything seems to work again, so I think I've been lucky and nothing else got damaged. The pitch swoops d
2026-02-01 by Ingo Debus
> Am 01.02.2026 um 04:09 schrieb Michael E Caloroso via Synth-diy : > > I would be MUCH more concerned with the 102VAC potential between shield and ground before replacing that opamp. Or even operating tha rogue device, that is a lethal electric shock waiting to happen!! That’s m
2026-02-01 by S Ridley
Measuring approx half mains voltage on class 2 mains equipment "0v" is not uncommon. It's generally due to mains filter caps forming a capacitive divider between live and neutral. The caps should be relatively small and mains rated, so should meet safety standards and is unlikely
2026-02-01 by Tony Mowbray
Switch mode power supplies nearly always need grounding as their outputs float, I've seen them as high as 60volts. One can often feel the difference. Never trust anything always check first and protect your gear. I've built a few guitar pedals and before I a was educated, I had a
2026-02-01 by Adam (synthDIY)
> On 1 Feb 2026, at 13:09, Michael E Caloroso wrote: > > I would be MUCH more concerned with the 102VAC potential between shield and ground before replacing that opamp. Or even operating tha rogue device, that is a lethal electric shock waiting to happen!! > > MC Agreed, but I th
2026-02-01 by Michael E Caloroso
I would be MUCH more concerned with the 102VAC potential between shield and ground before replacing that opamp. Or even operating tha rogue device, that is a lethal electric shock waiting to happen!! MC On Sat, Jan 31, 2026 at 9:12 PM Adam (synthDIY) synthdiy@adambaby.com > wrote
2026-02-01 by rburnett@richieburnett.co.uk
On 2026-02-01 02:08, Adam (synthDIY) wrote: > 102 volts!!!??? > I would never have thought of this.... I know. You can actually feel it! Some choice words were uttered I can assure you Adam. > Are the cap and resistor shown here on the output cooked as well? I'm > wondering why j
2026-02-01 by Adam (synthDIY)
Are the cap and resistor shown here on the output cooked as well? I'm wondering why just that op-amp blew....
2026-02-01 by Adam (synthDIY)
> On 1 Feb 2026, at 10:40, Richie Burnett wrote: > > I'm just cross that I didn't think of the *potential* for damage connecting/disconnecting Class-2 speakers to a piece of Class-1 earthed equipment. My multi-meter shows 102VAC between the shield on the audio cable coming from t
2026-02-01 by Gordonjcp
On Sun, Feb 01, 2026 at 12:40:28AM -0000, Richie Burnett wrote: > > Can anyone recommend a modern replacement for this part, before I pay an arm > and a leg for what might turn out to be a counterfeit LF13741 on ebay? The > device in my SH-09 is actually a circular metal can pack
2026-02-01 by Oren Leavitt
I think other JFET op amps (TL071 et al) should work - just need to adapt it the TO-99 can of the LF13741. Weird situation - I've used a pair of class-2 wall-wart powered Harman Kardon multimedia speakers for various monitoring. Never had a problem. Sounds like the Creative speak
2026-02-01 by Mike Bryant
I'm quite sure a TL071 will be fine. Can't see anything special in what is a very old design. As for your speaker PSU, what country are you in ? The problem with class 2 (to my mind) is that it assumes neutral is connected to earth somewhere, but in some countries earth sits half
2026-01-31 by Richie Burnett
Hi all, An unfortunate tale, a lesson learnt, and a question for the analogue experts... Today I was giving my old Roland SH-09 a quick test with some powered PC speakers that I had handy on my work bench plugged into the line output socket. (Creative T10 multimedia speakers powe
2026-01-30 by Nathan
Thanks for mentioning Menda! Their catalog ( https://menda.descoindustries.com/ ) is really impressive. I've also had the same problems as Jean-Pierre with cheap pump bottles (poor seal, deformed neck/threading, tube split or cut poorly, pump broken on arrival), and they're one o
2026-01-29 by Benjamin Tremblay
However the DJXs do use midi channels (greedily) to control the sounds.� I don’t think the XW devices have this.� Benjamin Tremblay On Jan 29, 2026, at 10:34 AM, Benjamin Tremblay wrote: Yes! I was thinking the same thing. A dream DSP product with barely enough integration. Othe