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2019-07-22 by yahoo@doepfer.de
Hello, indeed the VCAs used in the A-135-2 tend to close not fully with 0V CV. But actually we have added a small negative offset voltage in the circuitry to each VCA CV to avoid this flaw (resistors R3, R7, R11, R15, all 10MOhm). If you are familiar with electronics you may redu
2019-07-15 by Chris Bassett
Hello, I got an A-135-2 a few months ago to use as a quad VCA. I notice that with all the knobs turned completely to the left and no CV signal plugged in, if I connect a signal to an IN socket on any one of the VCAs, the signal is still present at the output for that individual V
2019-07-12 by yahoo@doepfer.de
Hello Karl, before you replace the BBD chip I'd recommend to measure the clock output (center top socket). It should output a rectangle in the frequency range about 10 kHz ... 200 kHz when the delay clock control is operated from 0 to 10. It could be also another range (e.g. abou
2019-07-11 by zoog_angelspit@yahoo.co.uk
Thank you Dieter! I replaced the LM324 and the CV input works! the delay is still very slight. its a 1024, yet the delay sounds tiny. Q: if the delay chip is fried, can I replace it? THANK YOU AGAIN! KARL.
2019-07-11 by karelvanbezooijen@yahoo.com
Thank you Dieter. I figured out this myself too. As andy2no suggested a bad solder joint could be the reason. After taking out the module once again and tinkering a bit it works fine now. I haven't used the gate input of EG 3 yet though. One never knows. Maybe that's the one. Dis
2019-07-08 by yahoo@doepfer.de
I don't think that it's a problem of the electrolytic capacitors because in the center position of the range switch no electrolytic capacitors are involved. Only in the upper and lower position of the range switch electrolytic capacitors are used as timing capacitors. In the cent
2019-07-08 by karelvanbezooijen@yahoo.com
That could be an explanation. As long as it works I'll leave it alone. Pity it isn't the lower one. Thanks for pointing out. Karel.
2019-07-08 by karelvanbezooijen@yahoo.com
No dodgy cable for sure. The cable is plugged in the upper EG. The other are normalled to this one. Karel.
2019-07-07 by man.of.mystery@ntlworld.com
Since it's an intermittent fault (i.e. sometimes works), it could be a dry or cracked solder joint, maybe on something that can get subjected to mechanical stress, like a socket or header pin. I have an A-106-6 filter, which I bought used. When it arrived, one of the outputs didn
2019-07-07 by Steven Jenkins
Dodgy cable ? I’ve had more than the odd patch cable fail/have a poor connection/loose joint. Just a thought. Steve Out of office - sent from mobile device > On 7 Jul 2019, at 20:31, karelvanbezooijen@yahoo.com [Doepfer_a100] wrote: > > I checked the board. > M - position uses 10
2019-07-07 by karelvanbezooijen@yahoo.com
I checked the board. M - position uses 100n Film + 2u2u electrolytic L - position uses 100n Film H - position uses 100n Film + 100u electrolytic As the envelope attack stayed long in every position it couldn't be the electrolytic caps I guess. I tried to measure the diodes but th
2019-07-07 by karelvanbezooijen@yahoo.com
Thank you all for the replies. Checking the capacitors seems the easiest option. As switching between M-L-H position doesn't have any effect on the envelope maybe one of them is defect. The one that is in all signal paths. Karel.
2019-07-06 by swalker@fraserwalkerltd.co.uk
Hi Karel I can certainly endorse the electrolytics as the first component to check. I had a faulty dx7II. Wouldn’t switch on. I replaced all the electrolytic capacitors on the power board. Cost me less than 5 Euros. Works like new now. Stu From: Doepfer_a100@yahoogroups.com Sent:
2019-07-06 by man.of.mystery@ntlworld.com
Karel, Electrolytic capacitors are probably the shortest lived of all components in common use, so I'd always suspect those first. I've never seen an A-143-2, but I've found a good image of one on schneidersladen.de, via a google image search. I see what looks like four identical
2019-07-06 by karelvanbezooijen@yahoo.com
Thank you for your fast reply. I'll check and see if I can replace the diodes and transistors. I assume they are general ones. Otherwise I'll send it for repair. Best regards, Karel.
2019-07-05 by yahoo@doepfer.de
I'm sorry about the problems with the module. Maybe one or more of the diodes and/or transistors are defective. If you cannot fix the the problem please follow the repair notes on the FAQ page of our website: www.doepfer.com > English > FAQ > General > Repair procedure Best wishe
2019-07-05 by yahoo@doepfer.de
Hello Karl, I'm sorry about the problems with the module. From the distance it's difficult ti find out what's wrong. If the CV inputs have no effect and even the CV out does not work I suppose that the quad operational amplifier IC2 (LM324 or TL084 below the OFFSET trimming poten
2019-07-05 by karelvanbezooijen@yahoo.com
While using one of the EG of this module all of a sudden it did not function well anymore. None of the pots has any influence on the envelope. The attack stays at max. I already replaced both TL084 and CMOS555 but that didn't solve anything. The other three still work fine. Any s
2019-07-02 by zoog_angelspit@yahoo.co.uk
Hey Rob, let me know if you want at A-129/4 Slew Limiter Controller. I have one here. Never used it.
2019-07-02 by zoog_angelspit@yahoo.co.uk
I fear my A-188-1 is faulty. What's embarrassing it that I think it's been busted the entire time I've had it (I bought it brand-new years ago). Symptoms: the CV inputs do nothing. I can not hear the delay effect I can hear a "phasing movement" sound when I turn the Delay Clock.
2019-05-30 by Bakis Sirros
hi all, Extremely happy to announce the album release of my latest collaboration with Ingo Zobel on the label Neotantra . Ambient music made with modular synths, available as limited edition CD and download. Interconnected - Extended Environments https://neotantra.bandcamp.com/al
2019-05-01 by Diego Ragnini
Alexander thanks for your precious informations The PSU2 apparently is not enough, it had been replaced with the PSU3, if I properly remember Best, Diego Il giorno 01 mag 2019, alle ore 18:47, aua130@yahoo.de [Doepfer_a100] Doepfer_a100@yahoogroups.com > ha scritto: Hi Diego, no,
2019-05-01 by aua130@yahoo.de
Hi Diego, no, I did not do a lot of troubleshooting. The modules are in a Monster Base 168TE. Two PSU-2, all original by Doepfer. Only thing I did was to replug modules into different bus boards until hum went down to an acceptable level. As soon as I moved the Master module on a
2019-05-01 by Diego Ragnini
Hi Alexander, thanks a lot for your reply, 8ch 3 subs is a huge system I am not surprised that it requires a huge amount of mV but warming up is not good news Did you troubleshoot enough in order to ascertain that heat and hum are due to the great power need ? I am not sure wheth
2019-05-01 by aua130@yahoo.de
Hi, I have this mixer. 8 Channels, 3 Groups and 1 master. The feature set is really great and also usability has been well though through. A couple of remarks are however: - draws a lot of power and also gets very warm - I use it in a Doepfer base case in the bottom row. The inpu
2019-05-01 by Diego Ragnini
Does anybody has tried this mixing system? http://frap.tools/products/mixer/ So fetchingly surprised to discover a truly comprehensive modular system for mixing within the euro rack. At first glance, the only missing feature is a phase inversion button on the channel strip, thoug
2019-05-01 by rwillis@lsu.edu
Hi, I couldnt afford one of these when I was younger at university, and thought I could buy one later. But now they are no longer produced. So anyone want to sell a a129/3? I would also be interested in an a129/5, but I know that is a harder to find module.... It is a real shame
2019-04-29 by yahoo@doepfer.de
Currently there are no plans to offer this module in the vintage version. But we collect inquiries for vintage modules to be able to estimate the interests in the vintage versions of modules. So there is some chance that they will be available as vintage versions in the near futu
2019-04-28 by soup
I'd like a pair of these dressed in black. Are there any plans to produce a vintage version of this? thanks, soup
2019-04-16 by yahoo@doepfer.de
Fort he A-111-3 all circuits are in sockets. As recommended I'd replace at first the TL084. If this does not help the CEM3340 has to be replaced too. The correct polarity of the bus connection cables is described in the FAQ page of our website: www.doepfer.com > English > FAQ > A
2019-04-16 by man.of.mystery@ntlworld.com
If your chips are in sockets, you could start by taking them out (note the orientation first) and checking if you still have the short. I'd start with the electrolytic capacitors (can shaped) on the grounds that they don't like reverse voltage, and are cheap to replace. Then I'd
2019-04-15 by jbragg@fernforest.co.uk
Hi there, accidentally plugged in power to a 111-3 the wrong way and smoke came off the poor little thing. I would like to point out that the cable was wired back to the front and this time it wasn't my fault. A friend with a multimeter says there is continuity now between -12v a
2019-04-13 by Neal Layton
A quick update: two 4M7 resistors in place and the bleed issue is resolved. Here’s a link to a blog post for the group archive which might be useful for any other folks with the same V2 iteration. https://nealbeardahm.blogspot.com/2019/04/doepfer-132-3-v2-bleed-mod.html Thanks ag
2019-04-10 by Neal Layton
Dear Dieter, Amazing- thank you. I will solder a couple of hefty 4M7 R’s in those places. Thank you for taking the time to reply personally, and for creating this wonderful world of sound for us to explore. Best wishes, Neal > On 9 Apr 2019, at 12:07, yahoo@doepfer.de [Doepfer_a1
2019-04-09 by yahoo@doepfer.de
Hello, V2 is an older version from 2010. Due to tolerances of the V2164D sometimes the VCA does not close with CV=0. To avoid this a high value resistor (e.g. 4M7) has to be added between pin 4 (upper VCA) or pin 5 (lower VCA) of the V2164 and -12V. This adds a small negative vol
2019-04-08 by Diego Ragnini
I firstly thought that it could also depend by the gate or the envelope generator you’re using (if any), then I recall that some VCA are used not to close completely, finally I read that your VCA is mounted on a low cost case so I am afraid it might depend on the floating ground.
2019-04-08 by neal@neallayton.co.uk
Hello all. I’ve just noticed an unusual behaviour on my A132-3 Dual VCA With no gain and 0 cv the bottom channel is letting bleed through. It seems to be on linear mode only, and it is easily audible. Top channel is fine. Looking at the pcb my module is a v2 revision with two TL0
2019-04-08 by exakoustidismiltiadis@hotmail.com
For one more time, thank you very much again Dieter! Everything now is crystal clear! I suppose... :-) Best Regards, Miltos
2019-04-08 by yahoo@doepfer.de
Hello, you find my answers written inline. Best regards Dieter Doepfer > -----Ursprüngliche Nachricht----- > Von: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com] > Gesendet: Sonntag, 7. April 2019 14:44 > An: Doepfer_a100@yahoogroups.com > Betreff: [Doepfer_a10
2019-04-07 by exakoustidismiltiadis@hotmail.com
Hello again! I am a happy owner of this fantastic and versatile module! But I have some questions, maybe I have them due to my poor English. I read in the manual, page 5 Only control voltage s can be processed by the T&H unit due to the holding capacitors of the T&H circuits. The
2019-03-16 by exakoustidismiltiadis@hotmail.com
I went to my dealer, it's all fine, thank you once again! Best regards, Miltos
2019-03-11 by Jacco Ville
Danke Dieter :-) Sent from my IPhone. > Op 11 mrt. 2019 om 09:23 heeft yahoo@doepfer.de [Doepfer_a100] het volgende geschreven: > > Yes, for this the value of R2 (10k) has to be increased. R2 is located next > to the lower input socket (near capacitor C5/100p). > > Best wishes >
2019-03-11 by exakoustidismiltiadis@hotmail.com
Thank you again for your valuable advice! I checked the supply voltage, it is pretty stable. The JP4 jumper was removed from the first day I bought A111-2. I will follow your instructions, if I will still not be able to re-adjust it, I will go to my dealer. Best regards, Miltos
2019-03-11 by yahoo@doepfer.de
Yes, for this the value of R2 (10k) has to be increased. R2 is located next to the lower input socket (near capacitor C5/100p). Best wishes Dieter Doepfer > -----Ursprüngliche Nachricht----- > Von: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com] > Gesendet: Sam
2019-03-11 by yahoo@doepfer.de
Hello, a pitch change in the 1-2 cent range is normal and may be caused e.g. by fluctuations of the supply voltage or stray pick-up from the CV line of the bus (if not used I'd recommend to remove the bus jumper JP4). I suppose that the module has to be re-adjusted unless there i
2019-03-10 by XCVII
Assuming no grounds are lifted and all other standard electrical practices are observed, are there any foreseeable conflicts with using PSU2 on the so-called balanced AC power? What could we expect to happen regarding the ground references for A100 signals crossing over multiple
2019-03-09 by jaccoville@yahoo.com
Hello all, I would like to know if the A183-3 Amplifier module can be modified to have more gain and use it a distortion? Thank you , Jacco Ville
2019-03-08 by exakoustidismiltiadis@hotmail.com
Thank you Dieter for your quick answer but I think that I was not so precise in my previous posts. I left it today for 30 minutes to warm up, the pitch is jumpin around the tuned frequency 1-2 cents. The main problem is still the octave switch, which still is not doubling the fre
2019-03-08 by yahoo@doepfer.de
I'm sorry about the problems with the module. First of all please check if your power supply is OK. Fluctuations of the supply voltages may cause such problems. If the supply is OK please return it to the dealer for repair. I suppose that in this case the CEM3340 or one of the tr
2019-03-07 by exakoustidismiltiadis@hotmail.com
Also, as long as I observe the output frequencies, independent of the waveform, are not stable, it jumps around a few hertz or whole semitones. Best regards, Miltos