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| Page 1 of 1 [21 Posts] |
| Author | Message |
|---|---|
 Topic: dual 281 project [build related stuff only!] |
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| gddfp Replies: 100 Views: 143535 |
Posted: Fri Feb 18, 2011 1:54 am Subject:
dual 281 project [build related stuff only!]
Forum: DIY Hardware and Software |
| Have a look at the original Buchla panel. The scaling marks around those knobs do not look very linear...
if you used a log pot, you would linearize the time vs. knob rotation relationship. Okay, ... |
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| Topic: dual 281 project [build related stuff only!] |
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| gddfp Replies: 100 Views: 143535 |
Posted: Thu Feb 17, 2011 10:49 pm Subject:
dual 281 project [build related stuff only!]
Forum: DIY Hardware and Software |
| I assume the pots for Attack & Decay are LOG (in the original) ?
they would be linear. Have a look at the original Buchla panel. The scaling marks around those knobs do not look very linear... ... |
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| Topic: dual 281 project [build related stuff only!] |
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| gddfp Replies: 100 Views: 143535 |
Posted: Thu Feb 17, 2011 5:44 am Subject:
dual 281 project [build related stuff only!]
Forum: DIY Hardware and Software |
| I assume the pots for Attack & Decay are LOG (in the original) ? | |
| Topic: new revision DUAL 281 PCB |
|
| gddfp Replies: 226 Views: 248991 |
Posted: Thu Feb 03, 2011 1:36 am Subject:
new revision DUAL 281 PCB
Forum: DIY Hardware and Software |
| Please please please don't use USPS for shipping to Europe ! It's a complete hassle, takes weeks and weeks, and the receiver has to pay additional customs fees, postage fees and 21% vat. Just use Fede ... | |
| Topic: new revision DUAL 281 PCB |
|
| gddfp Replies: 226 Views: 248991 |
Posted: Sun Dec 26, 2010 3:13 am Subject:
new revision DUAL 281 PCB
Forum: DIY Hardware and Software |
| Hi Josh,
Good news to hear from you ! I used your hotmail address... We'll let you sort out things at your ease. Here's plenty of other things to attend to anyway. Looking forward to ... |
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| Topic: new revision DUAL 281 PCB |
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| gddfp Replies: 226 Views: 248991 |
Posted: Sun Dec 26, 2010 12:37 am Subject:
new revision DUAL 281 PCB
Forum: DIY Hardware and Software |
| I paid for two over a month ago, and still didn't receive anything.
Email to Josh remained unanswered... 
What's up ? _g |
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| Topic: new revision DUAL 281 PCB |
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| gddfp Replies: 226 Views: 248991 |
Posted: Fri Jul 23, 2010 9:56 am Subject:
new revision DUAL 281 PCB
Forum: DIY Hardware and Software |
| That's why I asked in the first place: the noise & clutter, the "pollution".
The reservations & orders of PCB's -- often inbetween technical data -- reminds me a bit of the early ... |
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| Topic: new revision DUAL 281 PCB |
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| gddfp Replies: 226 Views: 248991 |
Posted: Fri Jul 23, 2010 8:05 am Subject:
new revision DUAL 281 PCB
Forum: DIY Hardware and Software |
| I think the general idea is that people show interest within the thread by requesting their desired amount. Then, once the boards are manufactured, the interested parties will receive an invoice via P ... | |
| Topic: new revision DUAL 281 PCB |
|
| gddfp Replies: 226 Views: 248991 |
Posted: Thu Jul 22, 2010 2:36 am Subject:
new revision DUAL 281 PCB
Forum: DIY Hardware and Software |
| Topp, how does this -- the ordering -- work exactly ?
Publicly [here] saying "hey, i'd like xx !", or just wait until you give the get go, and then order with you privately ? cheers, ... |
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| Topic: VCLFO ~ Ramp/Saw, Square not working |
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| gddfp Replies: 4 Views: 2599 |
Posted: Wed Jul 07, 2010 2:16 pm Subject:
VCLFO ~ Ramp/Saw, Square not working
Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson |
| After a lot of head-scratching, I found the problem.
A faulty TL082 (U5). This happened before with the TL07/8 series. I've got two VCLFO's happily pulsating now... _g |
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| Topic: CGS77 1973 VCF ~ output levels |
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| gddfp Replies: 1 Views: 3890 |
Posted: Wed Jul 07, 2010 2:11 pm Subject:
CGS77 1973 VCF ~ output levels
Subject description: CGS77 1973 VCF ~ succes ! Forum: DIY Hardware and Software » Ken Stone designs - CGS |
| To answer my own post:
Apparently I've blown up one of the JFet's (and probably also the nearby 2N3906), most likely by messing too much with the buffer section... After replacing those, I junke ... |
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| Topic: CGS77 1973 VCF ~ output levels |
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| gddfp Replies: 1 Views: 3890 |
Posted: Sat Jun 12, 2010 2:06 am Subject:
CGS77 1973 VCF ~ output levels
Forum: DIY Hardware and Software » Ken Stone designs - CGS |
| I've used the buffer section feeding the pots for the LP/HP/BP outputs.
Initially I left off the RGx resistors, but found the output way too low. After using 100k's for RGx (which should double the ... |
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| Topic: VCLFO ~ Ramp/Saw, Square not working |
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| gddfp Replies: 4 Views: 2599 |
Posted: Mon May 31, 2010 2:35 pm Subject:
VCLFO ~ Ramp/Saw, Square not working
Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson |
| Unless J210's have different pinouts than MPF102's, they are correctly seated.
Same pinouts. ~~~ I wired up my second VCLFO, this time with J201's instead of the J210 (*) The CV attenuators d ... |
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| Topic: VCLFO ~ Ramp/Saw, Square not working |
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| gddfp Replies: 4 Views: 2599 |
Posted: Mon May 31, 2010 6:18 am Subject:
VCLFO ~ Ramp/Saw, Square not working
Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson |
| The first thing I would do is check that Q4 and Q5 are in the correct way round. If they were backwards that would stop any signal getting to U5 and U6.
Unless J210's have different pinouts than MP ... |
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| Topic: VCLFO ~ Ramp/Saw, Square not working |
|
| gddfp Replies: 4 Views: 2599 |
Posted: Sun May 30, 2010 1:52 am Subject:
VCLFO ~ Ramp/Saw, Square not working
Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson |
| Hi,
The VCLFO is my first MFOS build. Sine & Triangle outputs work just fine. CV inputs, Coarse & Fine all work properly. As does the LED. However, the Saw & Ramp outputs sit at an ... |
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| Topic: CGS VCO - replacement for the lm394/MAT-02 |
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| gddfp Replies: 46 Views: 59486 |
Posted: Fri Dec 25, 2009 10:04 pm Subject:
CGS VCO - replacement for the lm394/MAT-02
Forum: DIY Hardware and Software » Ken Stone designs - CGS |
| Has anyone tried hand matching BC547B or any other cheap transistors on the CGS VCO... or VCA for that matter? That would save me around $60 on my current parts order!
Yes, I did (for the VCA's)... ... |
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| Topic: Inverter / Grounding |
|
| gddfp Replies: 9 Views: 5707 |
Posted: Wed May 06, 2009 2:26 pm Subject:
Re: Op-amp bias
Subject description: When pin 3 doesn't necessarily connect to Ground Forum: DIY Hardware and Software » Developers' Corner |
If you are confident you know the output voltage of the following arrangement (  cough cough, assuming it is wired-up correctly!), then there is no point in downloading the following PDF at ... |
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| Topic: Inverter / Grounding |
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| gddfp Replies: 9 Views: 5707 |
Posted: Wed May 06, 2009 6:38 am Subject:
Inverter / Grounding
Forum: DIY Hardware and Software » Developers' Corner |
| Thanks !
Onwards to an inverter with attenuator now...  |
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| Topic: Inverter / Grounding |
|
| gddfp Replies: 9 Views: 5707 |
Posted: Wed May 06, 2009 2:19 am Subject:
 Inverter / Grounding
Subject description: (solved) Forum: DIY Hardware and Software » Developers' Corner |
| Hi Scott,
I have solved the problem. Turned out I made a mistake on the breadboard (this is my first foray in breadboarding as well). The 100k input resistor was connected over the same board co ... |
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| Topic: Inverter / Grounding |
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| gddfp Replies: 9 Views: 5707 |
Posted: Tue May 05, 2009 6:04 pm Subject:
Inverter / Grounding
Forum: DIY Hardware and Software » Developers' Corner |
| Thanks for the explanation, Scott !
However, I already tried what I think you mean (see new schematic), and then I get +15V at the output... 
I've included a sketch how I connected the c ... |
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| Topic: Inverter / Grounding |
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| gddfp Replies: 9 Views: 5707 |
Posted: Tue May 05, 2009 3:30 pm Subject:
Inverter / Grounding
Forum: DIY Hardware and Software » Developers' Corner |
| Hi all,
My first post here, please be mild. I'm just starting out with some basic DIY, learning as much as I possibly can. Still have a long way to go with the most rudimentary of electronics p ... |
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| Page 1 of 1 [21 Posts] |
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