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| Search found 19 matches |
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| Page 1 of 1 [19 Posts] |
| Author | Message |
|---|---|
 Topic: PCB offer: Thomas Henry's 555-VCO |
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| doobedy Replies: 151 Views: 182319 |
Posted: Fri Mar 22, 2013 12:38 pm Subject:
PCB offer: Thomas Henry's 555-VCO
Forum: DIY Hardware and Software » fonik's place |
| Man I just noticed the prototype had an LFO switch and LED. I wish those had made it to the panel as well.
Is that just a switch changing capacitor values? How is the LED done? Not that I see ... |
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| Topic: SN Voice mixer control? |
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| doobedy Replies: 8 Views: 8792 |
Posted: Wed Mar 20, 2013 10:04 pm Subject:
SN Voice mixer control?
Forum: DIY Hardware and Software » Thomas Henry designs |
| Welp, I tried it with the SN Voice and it was 100% successful, all the way up to audio rate pseudo-mixing. Took anything I threw at it, even the triangle out and I learned about diode clamping and le ... | |
| Topic: SN Voice mixer control? |
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| doobedy Replies: 8 Views: 8792 |
Posted: Sun Mar 17, 2013 5:45 pm Subject:
SN Voice mixer control?
Forum: DIY Hardware and Software » Thomas Henry designs |
| How about a couple of Schottky diodes and a 10k resistor? Here's a thread about protecting chip inputs so the voltage stays in a safe range:
http://www.eevblog.com/forum/projects/pic-input-protecti ... |
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| Topic: SN Voice mixer control? |
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| doobedy Replies: 8 Views: 8792 |
Posted: Sat Mar 16, 2013 3:42 pm Subject:
SN Voice mixer control?
Forum: DIY Hardware and Software » Thomas Henry designs |
| Hmm, maybe this is exactly what a comparator is for. | |
| Topic: SN Voice mixer control? |
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| doobedy Replies: 8 Views: 8792 |
Posted: Sat Mar 16, 2013 3:11 pm Subject:
SN Voice mixer control?
Forum: DIY Hardware and Software » Thomas Henry designs |
| So I just finished up an SN-Voice in Eurorack, and it's using sneakthief's idea of switches to send 5v to mixer A/B/C. I really want to make a companion panel to be able to control them with logic/a ... | |
| Topic: Troubleshooting Heathkit Analog Trainer Oscillator Bleed? |
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| doobedy Replies: 5 Views: 5669 |
Posted: Sun May 31, 2009 3:27 pm Subject:
Troubleshooting Heathkit Analog Trainer Oscillator Bleed?
Forum: DIY Hardware and Software |
| Hi doobedy,
I'm hardly an expert on power supplies, but it looks to me that that design is just asking for trouble! Since the signal generator is powered from the (supposed) fixed +/-15V 'reference ... |
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| Topic: Troubleshooting Heathkit Analog Trainer Oscillator Bleed? |
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| doobedy Replies: 5 Views: 5669 |
Posted: Sat May 30, 2009 1:04 pm Subject:
Troubleshooting Heathkit Analog Trainer Oscillator Bleed?
Forum: DIY Hardware and Software |
| I think you might need some power supply decoupling caps in there.
Try some .01 ceramics to ground on the power supply circuit, from the fixed + 15 and - 15 volt lines and also after the adjustable v ... |
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| Topic: Troubleshooting Heathkit Analog Trainer Oscillator Bleed? |
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| doobedy Replies: 5 Views: 5669 |
Posted: Fri May 29, 2009 2:08 pm Subject:
Troubleshooting Heathkit Analog Trainer Oscillator Bleed?
Forum: DIY Hardware and Software |
| Hello!
I just bought a Heathkit Analog Trainer on Ebay, much like this one: http://www.heathkit.nu/ET-3100_blue.jpg I built up a CGS 52 wave folder to test it out, but when I plug the power ... |
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| Topic: Resonant Lopass Gate PCB's (New Batch 4/29/12) |
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| doobedy Replies: 926 Views: 728726 |
Posted: Tue May 26, 2009 9:41 am Subject:
Resonant Lopass Gate PCB's (New Batch 4/29/12)
Forum: DIY Hardware and Software |
| I put my pcbs in a plastic sandwich bag, suck out all the air, and pop into the freezer until I'm ready. I feel silly doing it, but it seems to slow down oxidation a lot on these lead free boards.
... |
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| Topic: Can you get +24v from a -12/+12 power supply? |
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| doobedy Replies: 8 Views: 3263 |
Posted: Sat May 02, 2009 6:51 pm Subject:
Can you get +24v from a -12/+12 power supply?
Forum: DIY Hardware and Software |
| There is 24V between -12 and +12. But,......
The problem is that if that PSU uses the ground between the +12 and -12 for anything then using the -12V for your 24V ground will short out the PSU. Does ... |
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| Topic: Can you get +24v from a -12/+12 power supply? |
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| doobedy Replies: 8 Views: 3263 |
Posted: Sat May 02, 2009 2:51 pm Subject:
Can you get +24v from a -12/+12 power supply?
Forum: DIY Hardware and Software |
| Actually, the difference between -12v and + 12v is zero volts, in the real world. I could be wrong, but I think you're going to have to find another ps.
The voltage difference between the two is 24 ... |
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| Topic: Can you get +24v from a -12/+12 power supply? |
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| doobedy Replies: 8 Views: 3263 |
Posted: Sat May 02, 2009 12:22 pm Subject:
Can you get +24v from a -12/+12 power supply?
Subject description: Looking to build a preamp that wants +24v Forum: DIY Hardware and Software |
| I was reading this article:
http://www.diyfactory.com/projects/fetboy/hamptone_fet_scan.jpg About how to build a mic/instrument preamp or mixer from jfets, and the circuits want +24v. I wanted ... |
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| Topic: SOLD: DSI Polyevolver Keyboard w/Case, US |
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| doobedy Replies: 2 Views: 2008 |
Posted: Fri Apr 24, 2009 11:09 pm Subject:
SOLD: DSI Polyevolver Keyboard w/Case, US
Forum: Wanted, For Sale, Opportunities and Requests » Equipment/Software Wanted and For Sale |
Goikem is a top notch seller, and that's a fantastic price  |
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| Topic: WTB: Plan B Model 9 Mixer and Model 39 Wave Splicer |
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| doobedy Replies: 4 Views: 2090 |
Posted: Tue Mar 17, 2009 10:11 pm Subject:
WTB: Plan B Model 9 Mixer and Model 39 Wave Splicer
Forum: Wanted, For Sale, Opportunities and Requests » Equipment/Software Wanted and For Sale |
Model 9 was gone, so I'm still looking for both modules  |
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| Topic: WTB: Plan B Model 9 Mixer and Model 39 Wave Splicer |
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| doobedy Replies: 4 Views: 2090 |
Posted: Sun Mar 15, 2009 10:14 pm Subject:
WTB: Plan B Model 9 Mixer and Model 39 Wave Splicer
Forum: Wanted, For Sale, Opportunities and Requests » Equipment/Software Wanted and For Sale |
| Thanks goikem
I dropped him an email about the Model 9 he has. |
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| Topic: WTB: Plan B Model 9 Mixer and Model 39 Wave Splicer |
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| doobedy Replies: 4 Views: 2090 |
Posted: Sun Mar 15, 2009 9:18 pm Subject:
WTB: Plan B Model 9 Mixer and Model 39 Wave Splicer
Forum: Wanted, For Sale, Opportunities and Requests » Equipment/Software Wanted and For Sale |
| Hi everyone,
I'm looking to buy these modules if anybody is looking to sell! Just let me know. Thanks. |
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| Topic: CRACKLEBOX lm709 replacement |
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| doobedy Replies: 3 Views: 10374 |
Posted: Thu Feb 12, 2009 6:00 pm Subject:
CRACKLEBOX lm709 replacement
Forum: DIY Hardware and Software |
| Just a quick confirmation on this somewhat ancient post for future cracklebox builders, the NTE 909 or 909d do work exactly the same as the LM709 series op amps.
I just breadboarded a metal can ver ... |
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| Topic: 2nd run of Thomas Henry's SN76477 Super Controller Module |
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| doobedy Replies: 66 Views: 43479 |
Posted: Wed Feb 04, 2009 12:37 pm Subject:
2nd run of Thomas Henry's SN76477 Super Controller Module
Forum: DIY Hardware and Software » Thomas Henry designs |
| @doobedy:
some valid points. yes, it is labor of love - but not abuse. this PCB run takes place with the kind permission of Thomas Henry. it is still his circuit design. if i published the PCB desi ... |
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| Topic: 2nd run of Thomas Henry's SN76477 Super Controller Module |
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| doobedy Replies: 66 Views: 43479 |
Posted: Wed Feb 04, 2009 2:42 am Subject:
2nd run of Thomas Henry's SN76477 Super Controller Module
Forum: DIY Hardware and Software » Thomas Henry designs |
| Hmm, Herr Herrman,
If you still take orders I would like to order one or 2PCBs as well if possible. Sorry for being late, I thought I found out about this after your cutoff date. You know this m ... |
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| Page 1 of 1 [19 Posts] |
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