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| Page 1 of 9 [222 Posts] | Goto page: 1, 2, 3, ..., 7, 8, 9 Next |
| Author | Message |
|---|---|
 Topic: 2017 Build Photos! |
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| prgdeltablues Replies: 101 Views: 86479 |
Posted: Wed Mar 29, 2017 6:08 am Subject:
2017 Build Photos!
Forum: DIY Hardware and Software |
| Latest addition: MFOS four pole (24dB/Oct) VCF. Modded to include HP, BP, and Notch outputs in both four pole and two pole flavours. Also modded to include a shruthi/jupiter enhancement to the resonan ... | |
| Topic: Weird Resonance CV Behaviour |
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| prgdeltablues Replies: 11 Views: 7663 |
Posted: Wed Dec 21, 2016 3:57 am Subject:
Weird Resonance CV Behaviour
Forum: DIY Hardware and Software |
| Silly question maybe, but you are centring the pot when you apply an external CV? Just that if the pot were at -12V, and you apply a CV below 0, the opamp mixer isn't going to be happy trying to sum t ... | |
| Topic: Fun useful tips |
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| prgdeltablues Replies: 112 Views: 142579 |
Posted: Thu Dec 01, 2016 11:13 am Subject:
Fun useful tips
Forum: DIY Hardware and Software |
| My tip:
Remember to slide the heatshrink onto the wire before you solder both ends (voice of experience) I've got into the habit of measuring the resistance between V+, ground and V- before I i ... |
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| Topic: Choice of multimeter for DIY/repair |
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| prgdeltablues Replies: 8 Views: 10613 |
Posted: Tue Oct 25, 2016 4:07 am Subject:
Choice of multimeter for DIY/repair
Forum: DIY Hardware and Software » The Repair Shop |
| I'd disagree with the transistor tester being a gimmick. Not because I've ever needed to know Hfe, but I use it a lot to check the pinouts - 2N3904 and BC547 are different for example, but effectively ... | |
| Topic: VC-LFO2 problem |
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| prgdeltablues Replies: 17 Views: 15274 |
Posted: Mon Oct 17, 2016 4:14 am Subject:
VC-LFO2 problem
Forum: DIY Hardware and Software » YuSynth |
| Weird. That suggests leakage somewhere.
I'd suggest replacing C1a and C1b - possible they may have been damaged by the excess current you previously had going through the BC557 (which would have bee ... |
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| Topic: VC-LFO2 problem |
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| prgdeltablues Replies: 17 Views: 15274 |
Posted: Sun Oct 16, 2016 4:32 am Subject:
VC-LFO2 problem
Forum: DIY Hardware and Software » YuSynth |
| Just a thought, but what temperature is your workplace? I work in a hut in the garden, and an lfo I built did just what you described. Then I found out that as the hut warmed up it started working pro ... | |
| Topic: Another problem thread. Please Help. |
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| prgdeltablues Replies: 10 Views: 16090 |
Posted: Thu Oct 13, 2016 5:53 am Subject:
Another problem thread. Please Help.
Forum: DIY Hardware and Software » Klee sequencer |
| Congratulations! So you now know there's nothing fundamentally wrong with the build. You've got an intermittent fault. My guess, from personal experience, is that it is most likely to be loose connect ... | |
| Topic: Another problem thread. Please Help. |
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| prgdeltablues Replies: 10 Views: 16090 |
Posted: Wed Oct 12, 2016 5:04 am Subject:
Another problem thread. Please Help.
Forum: DIY Hardware and Software » Klee sequencer |
| Can you check the voltage at pin 11 of U9? In one mode it ought to be approximately V+, in the other, Ground. If that toggling isn't happening, that is the likely cause of your problem. Could be a sho ... | |
| Topic: Analog XOR |
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| prgdeltablues Replies: 74 Views: 129978 |
Posted: Fri Sep 02, 2016 8:18 am Subject:
Analog XOR
Forum: DIY Hardware and Software |
| Just built a dual one of these, and used the two spare op amps to make a third XOR, which is hard-wired to the outputs of the first two. In other words, you have A1 XOR A2, B1 XOR B2, and A XOR B avai ... | |
| Topic: Steiner Synthacon VCF |
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| prgdeltablues Replies: 80 Views: 155614 |
Posted: Mon Aug 01, 2016 6:29 am Subject:
Steiner Synthacon VCF
Forum: DIY Hardware and Software » Ken Stone designs - CGS |
| Hi, and welcome!
Hard to tell from the pictures, but there is something wrong around the transistors. The emitters of T1 and T2 are pulled to V- through 3k9 and 82R, so ought to show something mo ... |
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| Topic: R.I.P. |
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| prgdeltablues Replies: 16 Views: 13124 |
Posted: Thu Jul 28, 2016 1:28 am Subject:
R.I.P.
Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson |
| Very sad news indeed. Like so many others here, I too first got the synth bug from Ray's WSG and Soundlab. And without his detailed documentation I probably wouldn't have started.
RIP |
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| Topic: 2016 Builds! |
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| prgdeltablues Replies: 174 Views: 136876 |
Posted: Mon Jul 11, 2016 5:41 am Subject:
2016 Builds!
Forum: DIY Hardware and Software |
| Finally completed building and de-bugging my MFOS 16 Step Quantized Vari-Clock Sequencer! Definitely the most complex module I've built - three boards: digital, vari-clock (stacked above each other) a ... | |
| Topic: 2016 Builds! |
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| prgdeltablues Replies: 174 Views: 136876 |
Posted: Mon Jun 13, 2016 1:35 am Subject:
2016 Builds!
Forum: DIY Hardware and Software |
| Simple phase shift oscillator producing a clean sine wave for comparison purposes when trimming the sine output of a VCO. Not going to see much use, but handy little circuit. Based on Elliot Sounds' m ... | |
| Topic: Crazy sound project using my barn |
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| prgdeltablues Replies: 9 Views: 6551 |
Posted: Wed Jun 08, 2016 9:26 am Subject:
Crazy sound project using my barn
Forum: DIY Hardware and Software |
| Richard Lerman comes to mind:
http://www.sonicjourneys.com/ Peter |
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| Topic: 2016 Builds! |
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| prgdeltablues Replies: 174 Views: 136876 |
Posted: Mon May 23, 2016 1:50 am Subject:
2016 Builds!
Forum: DIY Hardware and Software |
| Been meaning to build a CGS keypad scanner for years, finally got round to it. Outputs is in increments of semitones, whole tone (ie 2 semitones) and fifths. Forgot to make a hole in the front panel f ... | |
| Topic: Variable Range issue |
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| prgdeltablues Replies: 6 Views: 10293 |
Posted: Mon May 02, 2016 3:17 am Subject:
Variable Range issue
Forum: DIY Hardware and Software » Klee sequencer |
| I'd suspect U7 as well - its max input current is 10mA, and with U6 reversed, you might have exceeded that.
Peter |
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| Topic: Cgs10 question |
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| prgdeltablues Replies: 2 Views: 7113 |
Posted: Mon Apr 18, 2016 1:51 am Subject:
Cgs10 question
Forum: DIY Hardware and Software » Ken Stone designs - CGS |
| Hi, I've just breadboarded this circuit too. I find the keys don't always produce the right output - sometimes takes two or three presses. It might be the breadboard, or the keypad.
I reduced the ... |
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| Topic: 2016 Builds! |
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| prgdeltablues Replies: 174 Views: 136876 |
Posted: Wed Apr 06, 2016 1:47 am Subject:
2016 Builds!
Forum: DIY Hardware and Software |
| Thanks!. Yes, all my modules are stripboard (except for the Klee). I buy 119 x 455 mm lengths and cut to size (Rapid Electronics in the UK). This makes all my boards 46 rows deep, which fits nicely wi ... | |
| Topic: 2016 Builds! |
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| prgdeltablues Replies: 174 Views: 136876 |
Posted: Tue Apr 05, 2016 8:04 am Subject:
2016 Builds!
Forum: DIY Hardware and Software |
| Two-thirds of the way through building Ray Wilson's 16-step quantized vari-clock sequencer. Analogue and Digital boards installed and working, just got to build the vari-clock board...
One weird qu ... |
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| Topic: power connectors |
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| prgdeltablues Replies: 15 Views: 5790 |
Posted: Wed Feb 17, 2016 5:13 am Subject:
power connectors
Forum: DIY Hardware and Software |
| Not quite sure what you mean by 'ground lines connected at the headers' but the two grounds should connect as far back in the power circuitry as possible - mine come off from the same point at the reg ... | |
| Topic: power connectors |
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| prgdeltablues Replies: 15 Views: 5790 |
Posted: Tue Feb 16, 2016 2:33 am Subject:
power connectors
Forum: DIY Hardware and Software |
| Should have read 13/0.2 13 strands each 0.2mm diameter. Equates to 21 AWG.
Peter |
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| Topic: power connectors |
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| prgdeltablues Replies: 15 Views: 5790 |
Posted: Mon Feb 15, 2016 3:34 am Subject:
power connectors
Forum: DIY Hardware and Software |
| I moved from 3pin 0.1" molex headers for power to 4 pin, allowed me to have separate clean = analogue and dirty = digital grounds (they join back at the power supply, obviously). This supposedly ... | |
| Topic: Clock Multiplier? |
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| prgdeltablues Replies: 2 Views: 1878 |
Posted: Tue Jan 26, 2016 7:02 am Subject:
Clock Multiplier?
Forum: DIY Hardware and Software |
| You might have better luck using a clock divider, and just running the master clock faster? Yusynth and Fonik both have good and easy clock dividers.
I can't think how you could make an analogue ... |
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| Topic: 2015 Build Pictures |
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| prgdeltablues Replies: 135 Views: 119526 |
Posted: Wed Oct 21, 2015 5:37 am Subject:
2015 Build Pictures
Forum: DIY Hardware and Software |
Sorry to be slow in replying. Yes, wooden knobs, made from branches from the garden. All different sizes, none of them round 
Peter |
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| Topic: Troubleshooting Ultimate Repeat Gate |
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| prgdeltablues Replies: 11 Views: 7730 |
Posted: Mon Oct 19, 2015 8:08 am Subject:
Troubleshooting Ultimate Repeat Gate
Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson |
| It sounds like that to me too. Try checking you've got the correct values for R220 and R279, and that you haven't got shorts around those.
Peter |
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| Page 1 of 9 [222 Posts] | Goto page: 1, 2, 3, ..., 7, 8, 9 Next |
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