Search found 54 matches

If it's there to just speed up output switching on the op amp, how about using an actual comparator there instead? Would there still be a need for it if a different device is able to switch 1000 time ...

http://musicfromouterspace.com/analogsynth_new/VCO20120618REV0/images/vco20120615wsoic_page_2.gif

So I can't for the life of me figure out what this cap (C4, upper right corner) is doing. I've nev ...

Thanks Phobos, you always seem to be a wealth of information.

I think that if I did this, a limited run of 20 is what I'd try. What it is, is unique I think. It's a 2 channel quantizer with many sc ...

If you don't ever plan on using it in self oscillating mode and having good control over the tone, then you don't need a tempco or matched transistors. But if you think you might sometime down the li ...

Hey all,
So I've been doing DIY synth for some years now, and after developing at least what I think are some clever designs in eurorack format, I've been toying with the idea of doing a limited run ...

As for the 'feel' of the pots, and also quality, does anyone have a preference between Alpha and Bourns or others in similar configurations as those linked above? I've heard that Bourns are a little ...

Thanks Alan!
That helped narrow the search. Also found some by Bourns, PTV09 series U-types.

http://www.mouser.com/ds/2/54/tv09-777818.pdf

Hi all,
Does anyone know where to get potentiometers that don't require knobs? Basically what I'm looking for is just a plain, bushingless, plastic shaft, preferably with a line on the top. I'm fin ...

Well that worked a treat! A little hysteresis is just what the doctor ordered. I can't even force it to jitter!

helge-h, you read my mind.
I was just implementing a hysteresis into my code! Basically, I'm introducing 2 other variables for the previous output and the previous midpoint (crossover point between ...

Thanks sneakthief,
Well it looks like they're only using a 10 bit ADC also. And the only thing they're doing to process the signal is to level shift it so the pic can read it. That's what I was pla ...

So as my first project in micro controllers I'm making a quantizer using a pic16f877a. I know there are simpler ones that can be made out there but I wanted a lcd readout, 2 channels, and enough IOs ...

My noise cornucopia had a faint hum hidden in it and is driving me nuts. I hummed it into a guitar tuner and it's right at 60hz so pretty obvious where it's coming from. I just don't know how to ge ...

I got the wood in the back of my truck, got the Tolex, strap handle, feet and cab corners ordered. Hopefully I can get this cabinet banged out next weekend. I'll post a reality pic when it's done to ...

looks gorgeous and a cool sequence!

Thanks roglok!

I finally finished my take on a cmos based sequencer that's been sitting half together on the bench for almost 6 months.
I'm happy with it. Very Happy

Well I found the culprit. I had a capacitor on the reset input tied to V+ meant to initialize the chip upon power up. Not entirely necessary but a nice little feature. Why it was working on the bre ...

Okay. For a stupid little chip with only 2 inputs, this gremlin is being really hard to track down. I put it back on the bread board and it works just fine. I put it in the socket on the pcb (exact ...

Hi all,
I'm having problems with this chip and was hoping someone out there could help me out. For some reason timing diagrams are hard to come by in data sheets for this chip. The only one I could ...

A quick question for anyone who wants to offer their opinion. And I must preface this by saying this is for a boolean sequencer rather than a true Lunetta, but would you rather have an 8 stage shift ...

Thanks elmegil! Looks very compact. Kind of a different method than what I was expecting with the filtered PWM. I was expecting a DAC to be in there too. Have you tried this board before? If so d ...

Hi all. I was looking to build a quantizer but wanted something more than just a string of half steps. Does anyone know how to make a major/minor scale quantizer like the doepfer A156? Is this some ...

That sounds great!! And the chips are super cheap. I'm gonna have to try this one out.

Can we get a sound byte of that delay in action? Wink

My modules are still sans cabinet, so they're laid out in no particular or logical order.. but here they are.

http://farm9.staticflickr.com/8247/8575932377_5651bbd679_c.jpg
[url=http://www.flickr. ...

Author	Message
Topic: Capacitor in positive feedback of comparator?
Feifer Replies: 5 Views: 5701	Posted: Tue Jun 13, 2017 3:46 pm Subject: Capacitor in positive feedback of comparator? Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Feifer Replies: 5 Views: 5701	If it's there to just speed up output switching on the op amp, how about using an actual comparator there instead? Would there still be a need for it if a different device is able to switch 1000 time ...
Topic: Capacitor in positive feedback of comparator?
Feifer Replies: 5 Views: 5701	Posted: Tue Jun 13, 2017 1:51 pm Subject: Capacitor in positive feedback of comparator? Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Feifer Replies: 5 Views: 5701	http://musicfromouterspace.com/analogsynth_new/VCO20120618REV0/images/vco20120615wsoic_page_2.gif So I can't for the life of me figure out what this cap (C4, upper right corner) is doing. I've nev ...
Topic: Anyone here bring a product to market?
Feifer Replies: 5 Views: 5763	Posted: Sat Oct 01, 2016 8:09 pm Subject: Anyone here bring a product to market? Forum: DIY Hardware and Software
Feifer Replies: 5 Views: 5763	Thanks Phobos, you always seem to be a wealth of information. I think that if I did this, a limited run of 20 is what I'd try. What it is, is unique I think. It's a 2 channel quantizer with many sc ...
Topic: Expo Conversion for a Filter
Feifer Replies: 28 Views: 11263	Posted: Sat Oct 01, 2016 1:52 am Subject: Expo Conversion for a Filter Forum: DIY Hardware and Software
Feifer Replies: 28 Views: 11263	If you don't ever plan on using it in self oscillating mode and having good control over the tone, then you don't need a tempco or matched transistors. But if you think you might sometime down the li ...
Topic: Anyone here bring a product to market?
Feifer Replies: 5 Views: 5763	Posted: Sun Sep 18, 2016 2:35 pm Subject: Anyone here bring a product to market? Forum: DIY Hardware and Software
Feifer Replies: 5 Views: 5763	Hey all, So I've been doing DIY synth for some years now, and after developing at least what I think are some clever designs in eurorack format, I've been toying with the idea of doing a limited run ...
Topic: The correct pot for the job
Feifer Replies: 3 Views: 2253	Posted: Mon May 30, 2016 11:27 pm Subject: The correct pot for the job Forum: DIY Hardware and Software
Feifer Replies: 3 Views: 2253	As for the 'feel' of the pots, and also quality, does anyone have a preference between Alpha and Bourns or others in similar configurations as those linked above? I've heard that Bourns are a little ...
Topic: The correct pot for the job
Feifer Replies: 3 Views: 2253	Posted: Sun May 15, 2016 2:04 pm Subject: The correct pot for the job Forum: DIY Hardware and Software
Feifer Replies: 3 Views: 2253	Thanks Alan! That helped narrow the search. Also found some by Bourns, PTV09 series U-types. http://www.mouser.com/ds/2/54/tv09-777818.pdf
Topic: The correct pot for the job
Feifer Replies: 3 Views: 2253	Posted: Sat May 14, 2016 1:58 pm Subject: The correct pot for the job Forum: DIY Hardware and Software
Feifer Replies: 3 Views: 2253	Hi all, Does anyone know where to get potentiometers that don't require knobs? Basically what I'm looking for is just a plain, bushingless, plastic shaft, preferably with a line on the top. I'm fin ...
Topic: Developing voltage quantizer
Feifer Replies: 6 Views: 9345	Posted: Sat Jun 21, 2014 12:21 am Subject: Developing voltage quantizer Forum: DIY Hardware and Software » Microcontrollers and Programmable Logic
Feifer Replies: 6 Views: 9345	Well that worked a treat! A little hysteresis is just what the doctor ordered. I can't even force it to jitter!
Topic: Developing voltage quantizer
Feifer Replies: 6 Views: 9345	Posted: Fri Jun 20, 2014 9:17 pm Subject: Developing voltage quantizer Forum: DIY Hardware and Software » Microcontrollers and Programmable Logic
Feifer Replies: 6 Views: 9345	helge-h, you read my mind. I was just implementing a hysteresis into my code! Basically, I'm introducing 2 other variables for the previous output and the previous midpoint (crossover point between ...
Topic: Developing voltage quantizer
Feifer Replies: 6 Views: 9345	Posted: Thu Jun 12, 2014 11:04 am Subject: Developing voltage quantizer Forum: DIY Hardware and Software » Microcontrollers and Programmable Logic
Feifer Replies: 6 Views: 9345	Thanks sneakthief, Well it looks like they're only using a 10 bit ADC also. And the only thing they're doing to process the signal is to level shift it so the pic can read it. That's what I was pla ...
Topic: Developing voltage quantizer
Feifer Replies: 6 Views: 9345	Posted: Sun Jun 08, 2014 5:29 pm Subject: Developing voltage quantizer Forum: DIY Hardware and Software » Microcontrollers and Programmable Logic
Feifer Replies: 6 Views: 9345	So as my first project in micro controllers I'm making a quantizer using a pic16f877a. I know there are simpler ones that can be made out there but I wanted a lcd readout, 2 channels, and enough IOs ...
Topic: There's signal in my noise!
Feifer Replies: 1 Views: 1869	Posted: Fri May 23, 2014 9:14 pm Subject: There's signal in my noise! Forum: DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Feifer Replies: 1 Views: 1869	My noise cornucopia had a faint hum hidden in it and is driving me nuts. I hummed it into a guitar tuner and it's right at 60hz so pretty obvious where it's coming from. I just don't know how to ge ...
Topic: 2014 Build Pictures
Feifer Replies: 155 Views: 124150	Posted: Mon May 05, 2014 10:21 pm Subject: 2014 Build Pictures Forum: DIY Hardware and Software
Feifer Replies: 155 Views: 124150	I got the wood in the back of my truck, got the Tolex, strap handle, feet and cab corners ordered. Hopefully I can get this cabinet banged out next weekend. I'll post a reality pic when it's done to ...
Topic: 2014 Build Pictures
Feifer Replies: 155 Views: 124150	Posted: Sat Feb 22, 2014 1:02 pm Subject: 2014 Build Pictures Forum: DIY Hardware and Software
Feifer Replies: 155 Views: 124150	looks gorgeous and a cool sequence! Thanks roglok!
Topic: 2014 Build Pictures
Feifer Replies: 155 Views: 124150	Posted: Thu Feb 20, 2014 11:41 pm Subject: 2014 Build Pictures Forum: DIY Hardware and Software
Feifer Replies: 155 Views: 124150	I finally finished my take on a cmos based sequencer that's been sitting half together on the bench for almost 6 months. I'm happy with it.
Topic: 4040 troubles
Feifer Replies: 3 Views: 4132	Posted: Mon Nov 11, 2013 1:11 pm Subject: 4040 troubles Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Feifer Replies: 3 Views: 4132	Well I found the culprit. I had a capacitor on the reset input tied to V+ meant to initialize the chip upon power up. Not entirely necessary but a nice little feature. Why it was working on the bre ...
Topic: 4040 troubles
Feifer Replies: 3 Views: 4132	Posted: Sun Nov 10, 2013 5:45 pm Subject: 4040 troubles Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Feifer Replies: 3 Views: 4132	Okay. For a stupid little chip with only 2 inputs, this gremlin is being really hard to track down. I put it back on the bread board and it works just fine. I put it in the socket on the pcb (exact ...
Topic: 4040 troubles
Feifer Replies: 3 Views: 4132	Posted: Sun Nov 10, 2013 3:28 pm Subject: 4040 troubles Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Feifer Replies: 3 Views: 4132	Hi all, I'm having problems with this chip and was hoping someone out there could help me out. For some reason timing diagrams are hard to come by in data sheets for this chip. The only one I could ...
Topic: shift registers.. 4 vs 8
Feifer Replies: 1 Views: 2204	Posted: Tue Sep 10, 2013 11:09 am Subject: shift registers.. 4 vs 8 Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Feifer Replies: 1 Views: 2204	A quick question for anyone who wants to offer their opinion. And I must preface this by saying this is for a boolean sequencer rather than a true Lunetta, but would you rather have an 8 stage shift ...
Topic: Scaled quantizer
Feifer Replies: 4 Views: 2363	Posted: Sat Aug 31, 2013 7:06 am Subject: Scaled quantizer Forum: DIY Hardware and Software
Feifer Replies: 4 Views: 2363	Thanks elmegil! Looks very compact. Kind of a different method than what I was expecting with the filtered PWM. I was expecting a DAC to be in there too. Have you tried this board before? If so d ...
Topic: Scaled quantizer
Feifer Replies: 4 Views: 2363	Posted: Fri Aug 30, 2013 4:09 pm Subject: Scaled quantizer Forum: DIY Hardware and Software
Feifer Replies: 4 Views: 2363	Hi all. I was looking to build a quantizer but wanted something more than just a string of half steps. Does anyone know how to make a major/minor scale quantizer like the doepfer A156? Is this some ...
Topic: MY DIY Stuff
Feifer Replies: 14 Views: 6111	Posted: Sat Mar 23, 2013 9:30 am Subject: MY DIY Stuff Forum: DIY Hardware and Software
Feifer Replies: 14 Views: 6111	That sounds great!! And the chips are super cheap. I'm gonna have to try this one out.
Topic: MY DIY Stuff
Feifer Replies: 14 Views: 6111	Posted: Fri Mar 22, 2013 11:47 pm Subject: MY DIY Stuff Forum: DIY Hardware and Software
Feifer Replies: 14 Views: 6111	Can we get a sound byte of that delay in action?
Topic: 2013 Build Pictures
Feifer Replies: 177 Views: 151712	Posted: Wed Mar 20, 2013 10:52 pm Subject: 2013 Build Pictures Forum: DIY Hardware and Software
Feifer Replies: 177 Views: 151712	My modules are still sans cabinet, so they're laid out in no particular or logical order.. but here they are. http://farm9.staticflickr.com/8247/8575932377_5651bbd679_c.jpg [url=http://www.flickr. ...