[AVAILABLE] TTSH V4 Build Thread

From circuitbending to homebrew stompboxes & synths, keep the DIY spirit alive!

Moderators: Kent, Joe., luketeaford, lisa

Post Reply
User avatar
KSS
Super Deluxe Wiggler
Posts: 4166
Joined: Mon Jan 25, 2016 7:28 am

Re: [AVAILABLE] TTSH V4 Build Thread

Post by KSS » Tue Sep 08, 2020 10:12 pm

@sduck
Nice!

I can't tell from the photo if yours does or doeesn't, but you can make these so they transition from round circle at the speaker face to an oval at the panel. Which looks little more like the originals and uses more of the panel holes for potentially better sound. Build with circle on 3DP base and there are no 'overhang' issues.

To be truly effective these need a seal between them and the speaker and moreso with the panel. Auto parts store gasket goops work well.
Treat utility modules as stars instead of backup singers.
Treat power supplies like Rockstars instead of roadies!
Chase magic sound, not magic parts.

User avatar
sduck
experimental use of gravity
Posts: 13998
Joined: Wed Feb 18, 2009 6:03 pm
Location: Vortepexaion, TN, USA

Re: [AVAILABLE] TTSH V4 Build Thread

Post by sduck » Wed Sep 09, 2020 12:01 pm

Yes, when I ramp up my cad skills that might happen.

The speakers i've used in the past have a pretty nice soft rubber seal around the inner edge, so at least there's that. The speakers that came with the current TTSH kit aren't quite so nice - while they have a "seal" sort of gasket, it'll require some assistance to actually work right. I'm not sure I'm going to use them.

And of course there's the bigger question of "how much difference does all this malarkey make? Not much, right?" I don't know, all the ones I've built have had them. There was the one time I visited a local friend who had one that i had built, and while it was on his kitchen counter he started messing with it, getting some great sounds, cranked all the way up through the speakers. After a while we noticed a new sort of buzzing sound that wouldn't go away - ah, the sound of a blown speaker! At least that's an easy fix.
flickr cloud of sound touyube NOT A MODERATOR ANYMORE

User avatar
makers
Veteran Wiggler
Posts: 695
Joined: Wed Mar 20, 2013 1:54 pm

Re: [AVAILABLE] TTSH V4 Build Thread

Post by makers » Wed Sep 09, 2020 9:32 pm

I’m going to try something with the speakers used in this project:

viewtopic.php?f=17&t=236602

The built in radiator and speaker box are intriguing but they are 4 Ohm

User avatar
fuzzbass
Super Deluxe Wiggler
Posts: 2089
Joined: Thu Feb 06, 2014 6:08 pm
Location: Florida, USA

Re: [AVAILABLE] TTSH V4 Build Thread

Post by fuzzbass » Sat Sep 12, 2020 8:15 am

makers wrote:
Wed Sep 09, 2020 9:32 pm
I’m going to try something with the speakers used in this project:

viewtopic.php?f=17&t=236602

The built in radiator and speaker box are intriguing but they are 4 Ohm
There are some problems with running the on-board amps with 8 ohm loads (Peerless speakers), so 4 ohms may make things worse, but it also may not, depending on how much power these speakers need for drive, and whether their design is effective as a baffle or sealed (or ported) enclosure. What happens with the 8 ohm peerless speakers: when you crank the volume up high, and with low frequency content, the speakers bottom out. This is somewhat a factor of how much power is going in, but another factor in this is that there is no effective baffle or enclosure that would resist/suppress this behavior. When they go to maximum excursion, they rebound (get pulled back to center). When that happens, inductive spikes are generated in the speaker coils. These spikes make their way onto the power rails - affecting other parts of the synth. I have seen these spikes triggering pulses in the electronic clock, and creating sync-like effects for the VCOs.

If you have a pair of these drivers to experiment with, and they otherwise fit, I'm curious how they might work.
Wired for weird

User avatar
KSS
Super Deluxe Wiggler
Posts: 4166
Joined: Mon Jan 25, 2016 7:28 am

Re: [AVAILABLE] TTSH V4 Build Thread

Post by KSS » Sat Sep 12, 2020 11:13 am

Going back to the original PWR AMP design and using even 8ohm speakers is a bad choice. 4 would not improve it. Unless you *also* go back to the very original design and use impedance matchng transformers. The circuit is designed for 45ohm speakers. In the originals this also means less piwer supply current draw,compared to TTSH's which use speakers of lower impedance.

Either way, what fuzzbass is saying about the spikes should be paid attention to!
Treat utility modules as stars instead of backup singers.
Treat power supplies like Rockstars instead of roadies!
Chase magic sound, not magic parts.

User avatar
makers
Veteran Wiggler
Posts: 695
Joined: Wed Mar 20, 2013 1:54 pm

Re: [AVAILABLE] TTSH V4 Build Thread

Post by makers » Sat Sep 12, 2020 9:56 pm

Thanks for the tips. I read the similar posts in earlier build threads. I have really enjoyed working with this synth as a standalone instrument and using the internal speakers. I thought the low-fi quality of the 45 Ohm speakers that came with my kit would be appropriate for the context. But now I'd like to try something else.

I understand the power spikes and will certainly keep an eye out for that. But I was also worried about overheating the built in amplifiers. I planned to install the 4 Ohm speakers as is and gradually ease up the levels, checking the heat on the LM301's.

I have ordered 40 Ohm 20 Watt resistors to try in line with the speakers as well as the HW-711 amp used in the project I linked before. I spent too much time looking for matching transformers and gave up on that solution.

User avatar
Jim the Oldbie
Ultra Wiggler
Posts: 984
Joined: Mon Jun 10, 2019 12:16 am
Location: Midwest USA

Re: [AVAILABLE] TTSH V4 Build Thread

Post by Jim the Oldbie » Sun Sep 13, 2020 5:41 am

My TTSH build has been on hold for awhile, so I haven't had a chance to actually try this yet, but here's my plan:

I also opted for better speakers, namely these Peerless speakers from Parts Express. (They're very similar to the optional ones described in the BOM except the surrounds are innies instead of outies.) To me, it seems kinda pointless to try driving "normal" speakers like these with the TTSH speaker amps for reasons already discussed, so I intend to mount this little Class D amp board (also from P.E.) in an aluminum box inside the synth case. I'll connect its inputs to the back side of the headphone jack NC switch contacts, using a stereo 1K pot in between for level trim, maybe screwdriver-adjustable from the rear panel. The amp runs on the same voltage as the TTSH, so I'll just need a bigger wall wart for the extra current draw.

With this done, I hope to optimize the original TTSH speaker amp circuits for use simply as a headphone driver; they seem fairly well suited for this actually. I'm hoping all I'll need is a simple voltage divider on each output; something like 33 ohms in series followed by 6.8 ohms to ground, with the output taken from the junction to feed the headphone jack. This should accomplish several things:

1. Provide a reasonable load resistance (39.8 ohms) to the TTSH speaker amp circuits
2. Reduce output voltage (& noise) by about 15 dB to a more suitable range for headphones
(remember that this gain will be restored downstream by the second power amp to drive the speakers)
3. Provide an output impedance to the headphone jack of <6.8 ohms (a bit high these days, but not too bad)
4. The 33 ohm series resistance will provide short-circuit protection for the TTSH speaker amps (for events such as a mono 1/4" plug in the headphone jack).

What do you think, sirs?

User avatar
makers
Veteran Wiggler
Posts: 695
Joined: Wed Mar 20, 2013 1:54 pm

Re: [AVAILABLE] TTSH V4 Build Thread

Post by makers » Mon Sep 14, 2020 8:53 pm

I installed the Tang Band speakers
http://tb-speaker.com/products/t2-2136sa

They fit well and sound good but the 4 Ohm impedance is almost certainly causing power problems. If I push them too hard I get some pitch tracking problems

Update: I installed this miniature Class D amp to power the speakers. I increased the AC to DC power supply to 3 amps. Now it's rockin!

https://www.parts-express.com/tpa3116d2 ... l--320-699
Last edited by makers on Sun Sep 20, 2020 9:13 pm, edited 3 times in total.

User avatar
FrogStar
Common Wiggler
Posts: 249
Joined: Mon May 19, 2014 7:43 pm
Location: American't

Re: [AVAILABLE] TTSH V4 Build Thread

Post by FrogStar » Thu Sep 17, 2020 4:00 pm

Hi all, Having trouble with the Internal Clock. It does not generate a pulse. The slider is only lit solid on power up if both trim pots are maxed, but eventually goes dark within several minutes if not touched. If raised more that 3/4 it always goes dark. Lit or dark it doesn't pulse. The S&H is working great when tested with an external clock. I've confirmed Cap/diode orientation, and looked at all the resister values in that section. Any idea where I should look next?

d-pal
Learning to Wiggle
Posts: 2
Joined: Mon Sep 28, 2020 12:33 am

Re: [AVAILABLE] TTSH V4 Build Thread

Post by d-pal » Mon Sep 28, 2020 12:38 am

Hi folks, great thread!

I've reached main board stage 2 on ttsh V4 Rev8, and (hope you don't mind a stupid question) don't see any indications on the board (or in the instrucs) as to where the 2 pin amphenols go. There are a few likely spots, but they're umarked for the most part. Is there a diagram or image of the assembled board somewhere?

Thanks!
dp

d-pal
Learning to Wiggle
Posts: 2
Joined: Mon Sep 28, 2020 12:33 am

Re: [AVAILABLE] TTSH V4 Build Thread

Post by d-pal » Mon Sep 28, 2020 12:43 am

ah, think i found them, was thrown by a photo of an older model that used the red connectors in the e.g....anyway, assuming they are the amp L/R, eg gate/trig, and ext cv in?

User avatar
KSS
Super Deluxe Wiggler
Posts: 4166
Joined: Mon Jan 25, 2016 7:28 am

Re: [AVAILABLE] TTSH V4 Build Thread

Post by KSS » Mon Sep 28, 2020 12:59 am

FrogStar wrote:
Thu Sep 17, 2020 4:00 pm
I've confirmed Cap/diode orientation, and looked at all the resister values in that section. Any idea where I should look next?
Is this purchased kit or self sourced parts?

Which unijunction transistor did you use? 4870? 4871? Something else? And where did it come from? Are its legs matched to the PCB correctly?
Also want to confirm the pins of the transistor or transistors feeding the unijunction.<--ARP used two different designs with one or two transistors here and I don't know which version was used for the TTSHv4.

Kit parts I'd assume will not have these issues, but self-sourced may have different pinouts. The unijumction tranny is getting harder to find and even kit parts 'could' have a problem.

User avatar
Jruss993
Learning to Wiggle
Posts: 44
Joined: Mon Sep 23, 2013 1:55 am
Location: Canada

Re: [AVAILABLE] TTSH V4 Build Thread

Post by Jruss993 » Fri Oct 09, 2020 10:53 am

Well, I’m having a heck of a time troubleshooting my problems. Doesn’t help that I’m in the middle of a move and blah blah blah. Are there any wigglers in Canada (namely west coast), who could help me get this thing up and running? I’d gladly pay for your time at this point. Just want to play the darn thing so bad:(

gruebleengourd
Ultra Wiggler
Posts: 770
Joined: Mon Sep 24, 2012 11:49 am

Re: [AVAILABLE] TTSH V4 Build Thread

Post by gruebleengourd » Fri Oct 23, 2020 9:59 pm

I'm still having trouble repairing the traces that were damaged when I had to remove and replace the switches. Can someone provide pictures of the main board that identify the component numbers so I can hardwire the switches according to the version 3 schematics that are available? I am having trouble tracing the connections.

User avatar
fluxmonkey
Super Deluxe Wiggler
Posts: 1850
Joined: Sat Oct 18, 2008 10:05 pm
Contact:

Re: [AVAILABLE] TTSH V4 Build Thread

Post by fluxmonkey » Sat Oct 24, 2020 12:29 pm

has the panel layout changed since v1? I have a v1 panel, can I use it with the V4 PCB?
www.fluxmonkey.com

BUILDER FOR HIRE - kits or custom, email me with your needs

User avatar
sduck
experimental use of gravity
Posts: 13998
Joined: Wed Feb 18, 2009 6:03 pm
Location: Vortepexaion, TN, USA

Re: [AVAILABLE] TTSH V4 Build Thread

Post by sduck » Sat Oct 24, 2020 7:07 pm

Yes, they'll work interchangeably. I have both here, and have put them on top of each other - except for some small differences in hole sizes there's no difference.
flickr cloud of sound touyube NOT A MODERATOR ANYMORE

User avatar
fluxmonkey
Super Deluxe Wiggler
Posts: 1850
Joined: Sat Oct 18, 2008 10:05 pm
Contact:

Re: [AVAILABLE] TTSH V4 Build Thread

Post by fluxmonkey » Sun Oct 25, 2020 9:49 am

sduck wrote:
Sat Oct 24, 2020 7:07 pm
Yes, they'll work interchangeably. I have both here, and have put them on top of each other - except for some small differences in hole sizes there's no difference.
excellent, thank you! this had languished in my backlog, partly because of the amount of rework required on the V1pcb...
www.fluxmonkey.com

BUILDER FOR HIRE - kits or custom, email me with your needs

Jfettig
Learning to Wiggle
Posts: 16
Joined: Sat Jun 09, 2018 9:16 pm
Location: Brooklyn

Re: [AVAILABLE] TTSH V4 Build Thread

Post by Jfettig » Thu Nov 12, 2020 2:18 pm

Hi Guys,

I had a very happy TTSH for a good while, but I've blown the 2 10ohm resistors a couple of times from using the wrong cable type in the headphone jack. I keep replacing, only now, my pitch is very unstable on all 3 oscillators. it will be solid, and then it will do a slight wiggle or a big wiggle, or maybe just jump like a 5th and then that is the new center... the power output seems stable at the 15v points on the power board..

Any Ideas? What other parts might have been damaged from having a TS cable in the headphone jack?

Im getting discouraged.

Grateful for any thoughts.

Thanks.

J

nickbtx
Learning to Wiggle
Posts: 29
Joined: Fri Oct 18, 2019 6:39 am

Re: [AVAILABLE] TTSH V4 Build Thread

Post by nickbtx » Thu Nov 12, 2020 11:24 pm

Jfettig wrote:
Thu Nov 12, 2020 2:18 pm
Hi Guys,

I had a very happy TTSH for a good while, but I've blown the 2 10ohm resistors a couple of times from using the wrong cable type in the headphone jack. I keep replacing, only now, my pitch is very unstable on all 3 oscillators. it will be solid, and then it will do a slight wiggle or a big wiggle, or maybe just jump like a 5th and then that is the new center... the power output seems stable at the 15v points on the power board..

Any Ideas? What other parts might have been damaged from having a TS cable in the headphone jack?

Im getting discouraged.

Grateful for any thoughts.

Thanks.

J
Not sure when you completed your TTSH, but did you see Fuzzbass' notes about some of the jacks shorting to ground? This was added to one of the later versions of the V4 build guide:
"Signal traces transiting under some jacks can become shorted to the jack’s ground connection via the jack enclosure. This problem affects 19 of the jacks. A further explanation, the locations of these jacks, and suggested fixes are below in the section covering the jack installation."
Even though you weren't directly working on the jacks, if you had to remove the panel to service your synth, you could have disturbed them. It's worth looking into.
Good luck

Post Reply

Return to “Music Tech DIY”