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| Page 1 of 3 [51 Posts] | Goto page: 1, 2, 3 Next |
| Author | Message |
|---|---|
 Topic: The VCO-555 |
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| hedefalk Replies: 476 Views: 539477 |
Posted: Tue Nov 05, 2019 2:06 pm Subject:
The VCO-555
Forum: DIY Hardware and Software » Thomas Henry designs |
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My instant guess when seeing the pulse slew was that these op amps could possibly be re-labeled LM324s. Dan Thanks for feedback! I really do think you're right and I kindof reached the same conc ... |
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| Topic: The VCO-555 |
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| hedefalk Replies: 476 Views: 539477 |
Posted: Mon Sep 09, 2019 5:59 am Subject:
Cross-over distortion from 3 to kHz-something
Forum: DIY Hardware and Software » Thomas Henry designs |
| Okay, so I revisited this design. I have quite a few posts in this thread were I saw this distortion that looks something like cross-over distortion. Well, since my last post I've changed out _everyth ... | |
| Topic: The VCO-555 |
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| hedefalk Replies: 476 Views: 539477 |
Posted: Mon Jun 11, 2018 9:08 am Subject:
The VCO-555
Forum: DIY Hardware and Software » Thomas Henry designs |
Another update, sorry for spamming 
Ok, so I've basically resoldered everything and washed it thorough with isopropanol and no change. I'm pretty sure bad soldering isn't to blame. I just want to ... |
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| Topic: The VCO-555 |
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| hedefalk Replies: 476 Views: 539477 |
Posted: Sat Jun 09, 2018 2:48 pm Subject:
The VCO-555
Forum: DIY Hardware and Software » Thomas Henry designs |
| Have I've possibly been chasing just normal crossover distortion? https://youtu.be/VgodYtiD_F0
Could someone confirm they have better looking waves at 4kHz+? |
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| Topic: The VCO-555 |
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| hedefalk Replies: 476 Views: 539477 |
Posted: Thu Jun 07, 2018 1:20 pm Subject:
The VCO-555
Forum: DIY Hardware and Software » Thomas Henry designs |
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some of the point's i've noticed i have marked red and yellow… Thanks! I'll double check all these tomorrow! |
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| Topic: The VCO-555 |
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| hedefalk Replies: 476 Views: 539477 |
Posted: Thu Jun 07, 2018 10:05 am Subject:
The VCO-555
Forum: DIY Hardware and Software » Thomas Henry designs |
| I felt so ashamed right after posting those images that I re-wet all solder points and brushed it all with isopropanol.
https://photos.app.goo.gl/HKVW4Sg1xQeQ9KQH3 Still no change though  |
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| Topic: The VCO-555 |
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| hedefalk Replies: 476 Views: 539477 |
Posted: Thu Jun 07, 2018 7:17 am Subject:
The VCO-555
Forum: DIY Hardware and Software » Thomas Henry designs |
| Perhaps also post some pics of your VCO from both sides of the PCB, maybe someone can spot something we didn't discovered yet.
Hehe, I was a bit reluctant since this really isn't my proudest piece ... |
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| Topic: The VCO-555 |
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| hedefalk Replies: 476 Views: 539477 |
Posted: Fri Jun 01, 2018 4:14 am Subject:
The VCO-555
Forum: DIY Hardware and Software » Thomas Henry designs |
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Ramp isn't as bad, but still this can't be right can it? No, definitely not. Slew rate of TL07X should be 10V/uS and this is something like factor 50 from that at least. The square slew is waay ... |
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| Topic: The VCO-555 |
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| hedefalk Replies: 476 Views: 539477 |
Posted: Thu May 31, 2018 10:30 pm Subject:
The VCO-555
Forum: DIY Hardware and Software » Thomas Henry designs |
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I finally got two of these oscillators working. Turns out for me, the 7555 chips didn't work, it *needed* to be actual TLC555s. Huh, I actually tried with replacing the TS555CN I was using with ... |
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| Topic: The VCO-555 |
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| hedefalk Replies: 476 Views: 539477 |
Posted: Thu May 31, 2018 12:05 am Subject:
The VCO-555
Forum: DIY Hardware and Software » Thomas Henry designs |
| Tried swapping IC4 to an LM324N with the same results.
Resoldered all pins on IC4's socket. Checked the power pins for any visible fluctuations on IC4 but nothing visible on the scope. It does h ... |
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| Topic: The VCO-555 |
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| hedefalk Replies: 476 Views: 539477 |
Posted: Wed May 30, 2018 11:06 am Subject:
The VCO-555
Forum: DIY Hardware and Software » Thomas Henry designs |
| hmm... could be some PSU related... but i guess you're running the VCO alone on this PSU for testing purposes and Trouble Shooting... if not then disconnect everything else and see how it behaves then ... | |
| Topic: The VCO-555 |
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| hedefalk Replies: 476 Views: 539477 |
Posted: Wed May 30, 2018 6:37 am Subject:
The VCO-555
Forum: DIY Hardware and Software » Thomas Henry designs |
| Have you made any progress yet?
Not really It's lying on the desk in front of me staring, trying to pock my attention…
I looked again through the schematics i printed out before stripbo ... |
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| Topic: The VCO-555 |
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| hedefalk Replies: 476 Views: 539477 |
Posted: Mon May 28, 2018 3:17 am Subject:
The VCO-555
Forum: DIY Hardware and Software » Thomas Henry designs |
| The Offset looks okay, have checked against one of my builds i have a 5V offset...
So your triabgle at Pin8 doesn#t have these small edges? can't see it properly in your picture... Yes, exactly - ... |
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| Topic: The VCO-555 |
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| hedefalk Replies: 476 Views: 539477 |
Posted: Fri May 25, 2018 7:22 am Subject:
The VCO-555
Forum: DIY Hardware and Software » Thomas Henry designs |
| the pulse Looks like the comparator doesn't work in the expected range... the treshold seems to be too high, so that it looks like a pyramid with a flat top (which is the Point where the comparator ha ... | |
| Topic: The VCO-555 |
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| hedefalk Replies: 476 Views: 539477 |
Posted: Wed May 23, 2018 3:47 am Subject:
The VCO-555
Forum: DIY Hardware and Software » Thomas Henry designs |
| Ok, found one thing. The pulse is the one thing that looks the worst, its slow rising and falling. Noticed with the scope that that the output from 4D (pin14) peaks at 14V with a 12V supply…(!?)
... |
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| Topic: The VCO-555 |
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| hedefalk Replies: 476 Views: 539477 |
Posted: Mon May 21, 2018 1:28 pm Subject:
The VCO-555
Forum: DIY Hardware and Software » Thomas Henry designs |
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Maybe beef up your ground connections? Toss more uFs of power smoothing caps in there? Get the bypass caps closer to the power pins on the ICs? Thanks! Gonna look at those suggestions. I have g ... |
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| Topic: The VCO-555 |
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| hedefalk Replies: 476 Views: 539477 |
Posted: Mon May 21, 2018 1:23 pm Subject:
The VCO-555
Forum: DIY Hardware and Software » Thomas Henry designs |
| Just an update: my nudge issue turns up in KHz range, it isn't visible in lower frequencies. Also, the square and ramp is pretty slow rising/falling in the kHz range but looks ok in lower frequencies. ... | |
| Topic: The VCO-555 |
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| hedefalk Replies: 476 Views: 539477 |
Posted: Sat May 19, 2018 2:50 am Subject:
The VCO-555
Forum: DIY Hardware and Software » Thomas Henry designs |
| I'm finally taking this from the breadboard to a PCB. I'm having one small issue remaining - There is a nudge around 0V on each output. This is separate from the ramp connection which is the big one ... | |
| Topic: Debugging MFOS panning mixer… |
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| hedefalk Replies: 11 Views: 10675 |
Posted: Tue Mar 20, 2018 5:23 am Subject:
Debugging MFOS panning mixer…
Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson |
| Just an update:
Tried this earphone output with my old Beyer Dynamic DT-100 which is at 400 ohm. Sounds waaay better and the noise is hardly audible. I would just want to state the to some probably ... |
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| Topic: DCO has hard reset on normal analog expo VCO? |
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| hedefalk Replies: 5 Views: 3179 |
Posted: Thu Dec 07, 2017 2:29 am Subject:
Re: DCO has hard reset on normal analog expo VCO?
Forum: DIY Hardware and Software |
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There's no need to "tune it lower", you replace the comparator with the digital clock sync pulse, so the expo is out of the equation as far as resetting the integrator. Yes, this is exa ... |
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| Topic: Noisy wall wart PSU |
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| hedefalk Replies: 8 Views: 6022 |
Posted: Mon Nov 27, 2017 1:26 pm Subject:
Noisy wall wart PSU
Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson |
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Are you sure you are using AC wall warts? Yes, but I was using a 9V AC wall wart so that was most likely the problem. I haven't had the time to try it out with a 12V ac wall wart yet. The de ... |
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| Topic: Noisy wall wart PSU |
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| hedefalk Replies: 8 Views: 6022 |
Posted: Mon Nov 27, 2017 7:48 am Subject:
Noisy wall wart PSU
Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson |
| Hei,
i highly recommend to use fullwave rectification. Can I really do that with a two pole wall wart if I need bi-polar outs? |
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| Topic: DCO has hard reset on normal analog expo VCO? |
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| hedefalk Replies: 5 Views: 3179 |
Posted: Wed Nov 22, 2017 5:27 am Subject:
DCO has hard reset on normal analog expo VCO?
Forum: DIY Hardware and Software |
| Hm, come to think of it, most vco's have hard sync anyways? Maybe just make one really decent 1V/oct to sync pulse then… | |
| Topic: DCO has hard reset on normal analog expo VCO? |
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| hedefalk Replies: 5 Views: 3179 |
Posted: Wed Nov 22, 2017 5:17 am Subject:
DCO has hard reset on normal analog expo VCO?
Forum: DIY Hardware and Software |
| I just had a thought about VCO/DCO's that I haven't been able to google satisfactory. I guess there is nothing novel and that this idea has either been implemented or rejected, but I'm noob and suck a ... | |
| Topic: Debugging MFOS Dual VCA |
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| hedefalk Replies: 12 Views: 12904 |
Posted: Fri Nov 17, 2017 11:31 am Subject:
Debugging MFOS Dual VCA
Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson |
| I considered using this kinds of boards to do quick but permanent prototypes after feeling I have something feasible on the breadboard. Thing was that I started out with so many different projects and ... | |
| Page 1 of 3 [51 Posts] | Goto page: 1, 2, 3 Next |
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