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2007-06-08 by Louis van Dompselaar
The "D.U.T." is in a confusing place. It is meant to indicate the transistor in the diagram. The arrow that it is next to is just the ground connection. > continuing in the 'dumb' question category, Jim's diagram only shown > on connection for the Device Under Test. Could someone
2007-06-08 by Larry T.
continuing in the 'dumb' question category, Jim's diagram only shown on connection for the Device Under Test. Could someone 'fill in the blanks' as to how the dut is actually connected? Larry T. --- In cgs_synth@yahoogroups.com , Dave Kendall wrote: > > Thanks guys. > > :-) > > O
2007-06-08 by Dave Kendall
Thanks guys. :-) On 7 Jun 2007, at 14:43, sasami@... wrote: > > >Thanks for the tip. > >I checked this circuit > > http://www.oldcrows.net/~patchell/matcher/matcher.html > >It shows a PNP tranny. > >Would NPNs also work? > > Reverse all polarities for NPNs (i.e. the power supply,
2007-06-07 by sasami@hotkey.net.au
>Thanks for the tip. >I checked this circuit > http://www.oldcrows.net/~patchell/matcher/matcher.html >It shows a PNP tranny. >Would NPNs also work? Reverse all polarities for NPNs (i.e. the power supply, any diodes, and electros etc). >Also (this may be a dumb question....) What
2007-06-07 by Dave Kendall
Hi Louis. On 7 Jun 2007, at 11:58, Louis van Dompselaar wrote: > > > Would matching with the transistor tester in a DMM do the trick, or > do > > you need to measure parameters other than HFE? > > Transistors are usually matched on Vbe. > > That said, transistors /from the same b
2007-06-07 by Louis van Dompselaar
> Would matching with the transistor tester in a DMM do the trick, or do > you need to measure parameters other than HFE? Transistors are usually matched on Vbe. That said, transistors /from the same batch/ that are close in Hfe are probably close in other specs as well. So yes,
2007-06-07 by Dave Kendall
Hi. On 7 Jun 2007, at 00:52, sasami@... wrote: > They are matched to null out the signal. Unmatched transistors may have > audio bleedthrough. There is no reason why you can't try a pair of > ordinary > transistors, though your success will be greater if you can get a > pair from
2007-06-06 by sasami@hotkey.net.au
They are matched to null out the signal. Unmatched transistors may have audio bleedthrough. There is no reason why you can't try a pair of ordinary transistors, though your success will be greater if you can get a pair from the same batch. Ken >Hi all, > >Why exactly does the CGS
2007-06-06 by James Dunn
I tried building the EFM VCA5b which is almost identical to this with unmatched transistors, and the output was kind of noisy, and didn't resemble the input very closely with full gain. I think there was some CV crosstalk as well. As soon as I put a 2sc1583 in place of the transi
2007-06-06 by Jorrit Tyberghein
Hi all, Why exactly does the CGS64 (VCA) require matched transistors? What happens if you just use random transistors? In what way will the VCA not work correctly then? Greetings and thanks,
2007-06-05 by Richard Brewster
Is the sequence generated by the CGS Programmer Sequencer? I am also wondering if this is a "self-running" patch, or whether you "played" it during the recording by knob twiddling. Great picture! I showed it to my wife to prove that I am just one of many *enthusiasts* for MOTM st
2007-06-05 by Jorrit Tyberghein
I made a variant of the CGS10 using the 74C923 (instead of the 74C922). This version allows for 20 keys (4x5 rows) instead of 16. It works fine except for one problem. When pressing a key I get a nice binary 5-digit output corresponding with the pressed key. However, very often,
2007-06-04 by sasami@hotkey.net.au
Back off on the volumes of all three. The mixer is a summer - when the peaks coincide it adds them together, the result being greater than the mixer can handle (i.e. over 26 to 28V swing - over + or - 13 to 14 volts). Alternately find an averaging mixer. No I don't have one. Ken
2007-06-04 by Jorrit Tyberghein
Hi all, I have a cgs04 (DC mixer), a cgs18 (drum simulator), a noise generator, and some VCO. When the VCO and noise generator are connected to the mixer it works nicely. The two sounds mix very well. However as soon as I connect the drum simulator the sound of the VCO gets heavi
2007-06-04 by sasami@hotkey.net.au
uF. we are going for "driving tacks with a sledgehammer" approach here . adding a 100nF in parallel with the 100uF wouldn't hurt either. Ken >At 09:10 PM 6/3/2007, sasami@... wrote: > >>It may not be coming in through the power rails from outside, but rather >>being introduced on
2007-06-04 by John Mahoney
At 09:10 PM 6/3/2007, sasami@... wrote: >It may not be coming in through the power rails from outside, but rather >being introduced onto the power rails by the 4024 itself. The first thing to >do is to solder a 10uf to 100uf electro directly across the power pins of >the 4024. ..
2007-06-04 by sasami@hotkey.net.au
It may not be coming in through the power rails from outside, but rather being introduced onto the power rails by the 4024 itself. The first thing to do is to solder a 10uf to 100uf electro directly across the power pins of the 4024. If this helps, disconnect pin 14 the 4024 from
2007-06-03 by peng3002
I'm having the EXACT same problem as described in the post below. Louis, did you fix the problem? I tried the suggestions in the follow-ups but they didn't help with this problem. I'm using LF356H made by National with these markings: H24XX. I'm putting it on the breadboard to se
2007-06-03 by John Mahoney
At 05:44 PM 6/3/2007, sasami@... wrote: >The schematic was in Thomas Henry's book on the subject, as well as being on >the web somewhere. Doing a search should bring it up. Usually the diagram >uses both stages in series for a single follower, but a single stage is >quite good en
2007-06-03 by Mark
On 6/3/07, Larry T. put forth: >As for the NE571 (Philips SA571 too it appears), do you have a circuit >in mind? The price does not seem unreasonable for 2 followers if it >uses as few external parts as I suspect. But I'm not much at design. > OTOH, I can do breadboards and PC bo
2007-06-03 by sasami@hotkey.net.au
The schematic was in Thomas Henry's book on the subject, as well as being on the web somewhere. Doing a search should bring it up. Usually the diagram uses both stages in series for a single follower, but a single stage is quite good enough. Ken >Ken, thanks for the feedback on t
2007-06-03 by The Alison Project
http://www.thealisonproject.com/Torn_Envelopes_XV.mp3 a picture of the patch for this track can be found here http://www.thealisonproject.com/images/15.gif modules used - Blacet VCO's x3 - Blacet Miniwave - Blacet EG1's x2 - Blacet Binary Zone (as clock) - Blacet Improbability Dr
2007-06-03 by Larry T.
Ken, thanks for the feedback on the bandpass filter boards. As for the NE571 (Philips SA571 too it appears), do you have a circuit in mind? The price does not seem unreasonable for 2 followers if it uses as few external parts as I suspect. But I'm not much at design. OTOH, I can
2007-06-03 by sasami@hotkey.net.au
Hang some electros across your new voltage divider reference to decouple it, and use that as your "ground" for the other components. >Hi, > >On the subject of the band pass filter, I was looking at this circuit >today and was wondering if it could be powered from a single supply?
2007-06-03 by James Dunn
Hi, On the subject of the band pass filter, I was looking at this circuit today and was wondering if it could be powered from a single supply? I assume the + op amp inputs could be connected to a voltage reference of half the supply (using two equal value resistors) but what abou
2007-06-02 by Mark
On 6/2/07, Larry T. put forth: >I just need to find a small, simple envelope follower...) You can just wrap a full-rectifier around an op-amp followed by a one-pole LPF (a cap going to ground). There are numerous examples of various effects containing this sub-circuit on the web.
2007-06-02 by sasami@hotkey.net.au
Use pairs of 100k trimmers, NOT physically attached. That way you can adjust both the position and the width of the band. You could get a couple of envelope followers per NE571 if you don't mind the price. Ken >Hi Ken > >If I wanted to use a series of your bandpass filter boards
2007-06-02 by Larry T.
Hi Ken If I wanted to use a series of your bandpass filter boards to build a fixed filter bank, how would you suggest I replace the dual Freq pots with resistors for best affect? Something similar to the DotCom fixed filter bank ( http://www.synthesizers.com/q127.html) with bandw
2007-06-01 by Richard Brewster
What a great collection of modules! Looks like it's about time for Cabinet D. How do you like the Bananalogue VCS? Ages ago I cloned a Serge Dual Slope Generator. My first synth used those instead of ADSR type envelope generators. -Richard Brewster http://www.pugix.com data2actio
2007-05-31 by Louis van Dompselaar
> My "Dual tube VCA" would have also benefited from a feedback knob - I ended > up switching the CV pot over to a feedback knob, and I'll just use an > attenuator/multi I have elsewhere when I need one. I had space for a > feedback knob - I just didn't think about it before I was
2007-05-31 by Edward r Jones
SDIY won't post emails with html in them. So, send them with your gmail set to "plain text" I've had that problem before, I thought everyone just hated me. Know I know that only 25% of them hate me, and the other 75% weren't seeing my messages! -Edward Gerald Stevens logo64@... >
2007-05-30 by Andrew Scheidler
I'm flattered to have my layout used, but you're exactly right about the "thru" jack. My next batch will have them! They are especially useful when hooked up with a Joystick. Drew Gerald Stevens logo64@... > wrote: Two comments on these modules. I stole the layout for the Dual sl
2007-05-30 by data2action
all, just updated my gear page with some descriptions of recent builds, including ken's Tube VCA and Synthacon Filter... including a couple of FPD files for those modules in FracRack format. http://www.fluxmonkey.com/fluxGear.htm allbests, bbob drake fluxmonkey
2007-05-30 by Gerald Stevens
Greetings, I tried unsuccessfully to post this link to SDIY from two separate accounts - I think that SDIY must filter everything that comes from me like it was spam. http://www.youtube.com/watch?v=FhYi-nMuW8I This video was meant to showcase Ian Fritz's EZ chaos module, but it a
2007-05-29 by sasami@hotkey.net.au
>i'm noticing some chirrups in the output of my infinite melody when >it advances, and i'm wondering whether that's because the 4024 is a >ripple counter. it's not a huge problem, as i just pipe its output >through a sample & hold clocked from the same clock. Possible, though Ive
2007-05-29 by Jason Proctor
i'm noticing some chirrups in the output of my infinite melody when it advances, and i'm wondering whether that's because the 4024 is a ripple counter. it's not a huge problem, as i just pipe its output through a sample & hold clocked from the same clock. i just completed an anal
2007-05-27 by ken johnston
Now you gave him one we'll all want one. On May 27, 2007, at 7:43 PM, Ken Stone wrote: > --- In cgs_synth@yahoogroups.com , Pete wrote: > > > > Is this a new CGS module? I cant find it on the web site. Im all > about > > phase shifter's. > > No, it isn't a new module. It's a spar
2007-05-27 by Ken Stone
--- In cgs_synth@yahoogroups.com , Pete wrote: > > Is this a new CGS module? I cant find it on the web site. Im all about > phase shifter's. No, it isn't a new module. It's a spare serge phase shifter I let him have. His should have been a direct email, not to the group. Ken
2007-05-21 by sasami@hotkey.net.au
The Seq switch buffers will drive the mixers without problem If you are hard wiring, you can connect your mixer inputs straight to the emitters of the BC547 transistors. If you are doing this patch with patch-cords, due to the variations in loading caused by connection and remova
2007-05-21 by sasami@hotkey.net.au
>About to build this module, and may want to use +10V CVs as normal. >Is it as simple as swapping the 220K resistor between pins 6 and 7 of the LM358 for a >100K resistor - anyone see any gotchas with doing that? Correct. Ken ______________________________________________________
2007-05-21 by Richard Brewster
Theoretically it should be a 110K, but you probably won't notice much difference if you use 100K. -Richard Brewster http://www.pugix.com hitchindave wrote: > Hi guys. > > About to build this module, and may want to use +10V CVs as normal. > Is it as simple as swapping the 220K re
2007-05-21 by hitchindave
Hi guys. About to build this module, and may want to use +10V CVs as normal. Is it as simple as swapping the 220K resistor between pins 6 and 7 of the LM358 for a 100K resistor - anyone see any gotchas with doing that? cheers, Dave
2007-05-20 by Andrew
Great! I gots those :) thanks Ken, Drew --- In cgs_synth@yahoogroups.com , sasami@... wrote: > > Just use a 1uF electro. It's only the power on reset circuit. > > Ken > > >Oops, yeah that's the one I mean. Don't have it in front of me here > >at work :) > > > >I have the right nu
2007-05-20 by Andrew
Can the Gate Sequencer CV board be hooked up to the step outs of a Sequential Switch? (in order to add some extra rows of CV sequencing) Or is the buffer circuit on the Seq Switch already enough to support the load? I want to make an 8 step 4 row sequencer using a Seq Switch and
2007-05-19 by funkfumes
Hi all. My name's Evan. I'm a new member here. I've been into analogue synths for some years, having owned some standard commercial stuff, a Doepfer modular and, more recently, a small modular called the 'Sir G', that my friend Gus built, based on "Sounds From Outer Space" design
2007-05-19 by funkfumes
Marcel, Did you get your Steiner VCF working in the end? I think I have the exact same problem as you, though I didn't connect the power the wrong way around to begin with. It just keeps resonating... Any tips? Evan. --- In cgs_synth@yahoogroups.com , "marcel01011" wrote: > > > h
2007-05-19 by Mark
On 5/18/07, John Mahoney put forth: >At 11:36 AM 5/16/2007, Mark wrote: > > >Overall, Mouser seems to have lower prices on hardware -- jacks, > >switches, etc. -- than Digikey. > >Agreed. Yes, and now that I'm using Safari with their site, I've found that Mouser is easier on my m
2007-05-19 by John Mahoney
At 11:36 AM 5/16/2007, Mark wrote: >Overall, Mouser seems to have lower prices on hardware -- jacks, >switches, etc. -- than Digikey. Agreed. >While I'm typing, does anyone know a vendor that sells 4-conductor >18AWG cable by the foot?? I didn't notice this question until Rig ans
2007-05-19 by Mark Rauch
Howdy, Have you tried Jameco? Rig --- In cgs_synth@yahoogroups.com , Mark wrote: > > > Sorry for the double posting. Apparently, yahoogroups temporarily > stopped sending me email. > > I know that less voltage offset is a good thing. I was wondering if > that increase in performa
2007-05-18 by sasami@hotkey.net.au
Just use a 1uF electro. It's only the power on reset circuit. Ken >Oops, yeah that's the one I mean. Don't have it in front of me here >at work :) > >I have the right number of F's, but the wrong type. Is there any >chance that the ceramic will work or do I need to go shopping? >