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2019-03-07 by exakoustidismiltiadis@hotmail.com
Hello to all!!! In the last few days I have a tuning problem, when I tune lets say in C and switch the octave knob one step above or below it doesn't double or half double the frequency. Do anyone know how to solve this? Best regards, Miltos
2019-03-04 by omega_images2000@yahoo.it
Hi! As i was checking out the new -wonderful- poly modules, i was totaly impressed· and then, seeing the A-141-4 poly VCADSR, i thought, "hey, wouldn't it be great if Doepfer could use the same format for a "mono" version?!" of course, there is already the fully-featured A-141-2,
2019-02-28 by a11@live.nl
Fine, Dieter, and thank you for all the advice. Then I go futher to replace the ic's. Today I did IC3. And again nothing have changed. The next one will be IC8, tomorrow or next week. Good luck ---In Doepfer_a100@yahoogroups.com, wrote : If the frequency shifter works with an ext
2019-02-28 by yahoo@doepfer.de
If the frequency shifter works with an external quadrature VCO (A-143-9 or A-110-4) it clear that the internal CEM3382 based VCO is faulty. Best wishes Dieter Doepfer > Sorry, but I forgot to mention that I did the readjustment > [without scope], but things stay the same. But it
2019-02-27 by a11@live.nl
Sorry, but I forgot to mention that I did the readjustment [without scope], but things stay the same. But it was remarkable that: 1. only the Y2 bal. could minimize the signal appearing; but it did it very well. 2. the signal did not get as high as before, when turning fully with
2019-02-27 by yahoo@doepfer.de
The AS3360 is totally different compared to CEM3382/PA382 (e.g. 14 pin package instead of 8 pin). I don't think that it will work even if you would built kind of an adapter board. I think you will have to look for a CEM3382/PA382 e.g. on Ebay. But before that I'd check if the qua
2019-02-26 by a11@live.nl
Thanks Andy, I did not know that , and it is not expensive. Ben ---In Doepfer_a100@yahoogroups.com, wrote : ... and that chip (AS3360) is stocked by Thonk, in the UK, in DIP and SOIC versions.: https://www.thonk.co.uk/shop/alpha-as-series-ic-chips/ - Andy
2019-02-26 by man.of.mystery@ntlworld.com
... and that chip (AS3360) is stocked by Thonk, in the UK, in DIP and SOIC versions.: https://www.thonk.co.uk/shop/alpha-as-series-ic-chips/ - Andy
2019-02-26 by a11@live.nl
Fine Dieter, then I will leave that. I could see later on a picture that the multiplier of the additional resistor is yellow, so its value would be 100K. The picture I have made years ago. Now I have replaced IC7/MC1496, which have a socket, with a fresh one. But there were no ch
2019-02-26 by yahoo@doepfer.de
Probably the range of the trimming potentiometer P18 (- adjust) was not sufficient because P18 and R94 are connected in series. The effective value of R94 (normally 22k) has been probably reduced by soldering a second resistor in parallel to obtain the correct adjustment for P18.
2019-02-25 by a11@live.nl
But strange that one of my additional parts is a resistor, that has been soldered right at the same place of another resistor, but on the solder side. This resistor is R94/22K near the Up Output on the edge. The additional resistor is, I think, 10k; it is brown-black without a mu
2019-02-25 by yahoo@doepfer.de
I took a look at the old A-126 documentation. The additional parts have been added to stabilize the internal voltages (+9V, -9V). You will find probably two electrolytic capacitors (one soldered between GND and +9V, another between GND and -9V) and a Schottky diode (soldered betw
2019-02-25 by yahoo@doepfer.de
It's too early to speak about prices. We can calculate the module not before the development has been finished and the quantity of the first production run has been defined. But in any case it will be more expensive than the old frequency shifter because of the additional functio
2019-02-23 by rigo.schoeters@yahoo.com
> Does yours also have some parts on the solder side? 4 parts are soldered at the back.
2019-02-22 by a11@live.nl
Yes, thank you Rigo. I saw it in your thread about the PA382. And you are lucky you had one in an old module and lucky again you do not have to solder it. And lucky again, that your birthday is coming soon. Does yours also have some parts on the solder side? Ben ---In Doepfer_a10
2019-02-22 by a11@live.nl
Yes, I bought it very long ago. It also has 2 caps, 1 diode and 1 resistor on the solder side; so they do not go through the holes. But wait a minute, Dieter, hold it. You said: "It's a very special module which I do mainly for myself and I don't expect large sales". Do you mean
2019-02-22 by rigo.schoeters@yahoo.com
> I do not hope the CEM3382 is broken, for it is hard to find. Older versions of the A-131 have the differently named but identical circuit PA382, so buy some if some pop up for sale. On my A-126 the only chip that was in a socket was that CEM, so probably it is an older model as
2019-02-22 by yahoo@doepfer.de
So the A-126 seems to be very old as we use sockets for integrated circuits since nearly 20 years because it simplifies the service in case of a faulty integrated circuit clearly. Let's hope that the mentioned interruption is the only problem (apart from re-adjustment). The plann
2019-02-22 by a11@live.nl
Forgot to say that I do not have an oscilloscope to measure the circuit. I do not hope the CEM3382 is broken, for it is hard to find. And if the correct adjustment is very important, I will try to do that first. The adjustment I ever have made, is to reduce the sine bleeding with
2019-02-21 by man.of.mystery@ntlworld.com
Units always matter, Florian. From your added linear control line it's clear that you're talking about a unit of voltage, or multiples of volts. My ears do not register volts; they register dB, so the vertical axis of the graph, for audio level, should be the log of what you have
2019-02-21 by Diego Ragnini
Il giorno 21 feb 2019, alle ore 15:20, man.of.mystery@ntlworld.com [Doepfer_a100] Doepfer_a100@yahoogroups.com > ha scritto: Florian, I don't mean to be rude, but I think you underestimate my experience and intelligence. See above. - Andy Sometime on this list it happened that my
2019-02-21 by Florian Anwander
Hello Am 21.02.2019 um 17:06 schrieb man.of.mystery@ntlworld.com [Doepfer_a100]: > Okay, Florian. What are the units of your graph? > > Hearing is logarithmic, so try redrawing that graph with the y axis in dB. > > What do you see? There is no unit necessary. The unit might be "c
2019-02-21 by man.of.mystery@ntlworld.com
Okay, Florian. What are the units of your graph? Hearing is logarithmic, so try redrawing that graph with the y axis in dB. What do you see? - Andy
2019-02-21 by Florian Anwander
Hi Andy I am not a native english speaker as you may recognize, but I really have difficulties to understand your descriptions. You wrote: " it's the response of gain vs CV inputs that I'm talking about". And that is what the graph displays: the response of gain(=y-axis) versus t
2019-02-21 by man.of.mystery@ntlworld.com
Florian, I don't mean to be rude, but I think you underestimate my experience and intelligence. See above. - Andy
2019-02-21 by Florian Anwander
Am 21.02.2019 um 14:25 schrieb man.of.mystery@ntlworld.com [Doepfer_a100]: > To Florian: To be clear; it's the response of gain vs CV inputs that > I'm talking about, not the gain knob. If I set it for a non-deafening > level, at maximum CV input, there is very little response at
2019-02-21 by yahoo@doepfer.de
Hello Andy, the gain knob and the CV inputs behave in the same way. The voltages coming from the Gain control and the CV inputs are just added and the sum is used to control the exponential VCA based on the THAT2150. In other words: if you move the gain knob uniformly from fully
2019-02-21 by man.of.mystery@ntlworld.com
Thanks, Dieter. I'll give that some thought. I've sent you an email, to hardware@doepfer.de To Florian: To be clear; it's the response of gain vs CV inputs that I'm talking about, not the gain knob. If I set it for a non-deafening level, at maximum CV input, there is very little
2019-02-21 by yahoo@doepfer.de
Version 3 of the A-131 is based on the THAT2150 and the exponential scale is predefined by the THAT2150. The module is a plain standard application of the THAT2150 and there is nothing special. The trimming potentiometer "GAIN OFFSET/P6" is used to define the max. amplification (
2019-02-21 by Florian Anwander
Hello Am 21.02.2019 um 13:07 schrieb man.of.mystery@ntlworld.com [Doepfer_a100]: > I get a very gradual increase, then a very sudden one. Do you get this too, if you apply an external linear voltage? Or does it happen only with the "gain" potentiometer? Florian -- http://www.flor
2019-02-21 by man.of.mystery@ntlworld.com
I have a degree in maths, and I studied electronic engineering for a while. I also own more synthesizers than I probably should - so I understand the concepts involved. What I mean is, the response curve of this one, for gain vs CV, is far from desirable. I get a very gradual inc
2019-02-21 by yahoo@doepfer.de
Hello Andy, over the years 3 different version of the A-131 were manufactured. For details please refer to our website: www.doepfer.com > English > PRODUCTS > A-100 > Module Overview > A-131 Only for version 2 (with CA3080) it was possible to trim the exponential scale a bit by m
2019-02-21 by Florian Anwander
Hi Andy Am 21.02.2019 um 12:09 schrieb man.of.mystery@ntlworld.com [Doepfer_a100]: > It tends to go from a little bit too quiet to way too loud, rather > suddenly, That is how exponential VCAs do work. There is nothing to adjust, that would change that behaviour. Florian
2019-02-21 by man.of.mystery@ntlworld.com
Is there a calibration procedure document, for the Doepfer A-131 exponential VCA? I bought one used, a while ago, and I've never been sure it's set up as it should be. It tends to go from a little bit too quiet to way too loud, rather suddenly, making me fear for my eardrums, on
2019-02-21 by yahoo@doepfer.de
Hello Ben, that's strange. The level of the up/down sounds should not depends upon the shift frequency. This points to a problem with the quadrature oscillator (i.e. that the sine and cosine are not stable/present at each frequency). I don't think that it's a problem of the adder
2019-02-20 by a11@live.nl
Thank you for your reply, Dieter. Today I replaced the TL084 and indeed I could now hear down-sounds, but not at every Shift value/level. It's irregular. And the down and up outputs are still equal (same sound). Next I will look for a new trimming potentiometer for the down adjus
2019-02-20 by rigo.schoeters@yahoo.com
Swapped the chips ... A-126 works as expected, A-131 doesn't work properly. I'd say the problem is solved Maybe one day I will still look at the calibration procedure. And make the connection between A-126 and A-143-9.
2019-02-20 by yahoo@doepfer.de
Yes, this should work. You may also try the CEM3382 from the A-126 in the A-131 to make a crosscheck. Good luck Dieter Doepfer > -----Ursprüngliche Nachricht----- > Von: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com] > Gesendet: Mittwoch, 20. Februar 2019 16:2
2019-02-20 by rigo.schoeters@yahoo.com
Can I try to replace the CEM3382 with the PA382 from an old A-131, just as a test ? I got the A-126 together with an A-143-9, so when sending in is needed they will both come
2019-02-20 by yahoo@doepfer.de
As already mentioned in the other email the A-126 is a very complex circuit. But if the up shift is working there is some chance that only the adder for the down shifting is faulty. It's built around the TL084 between the two ring modulators MC1496. If replacing the TL084 does no
2019-02-20 by yahoo@doepfer.de
The A-126 is a very complex module (quadrature VCO, dome filter, two ring modulators, adders/subtractors) and it's impossible from the distance to make a diagnosis what is wrong if it's not working at all. Maybe the quadrature VCO (based on rare CEM3382) is broken. But that's onl
2019-02-20 by a11@live.nl
Hello to you all, [What a coincidence with Rigo's broken A-126!]. Today I started to try to fix my old A-126 by just replace some suspected components. Because the Shift and Mix and Up-Down outputs do not work properly at all; for you just hear some changes in sound, when turning
2019-02-19 by rigo.schoeters@yahoo.com
I managed to get an A-126, but it seems to be broken. The only knob that does something is the level knob, and I have to turn it up a lot to actually get something out of the outputs. Manual shift, CV and Mix don't do anything at all. I didn't try the calibration procedure as it
2019-02-16 by Bakis Sirros
Video for the track 'Gat mk2' by Interconnected (Ingo Zobel & Bakis Sirros), from the forthcoming ambient CD album 'Extended Environments', that will be released in the first half of 2019, on the Neotantra Label of Lee Norken. Video by Mamonu. Ambient made with Modular synths! (i
2019-02-06 by jaccoville@yahoo.com
Danke sehr Dieter
2019-02-06 by yahoo@doepfer.de
Please refer to our website: www.doepfer.com > English > MANUALS > Dark Energy I additional technical notes (Dark_Energy_technical_information.pdf) Best wishes Dieter Doepfer > -----Ursprüngliche Nachricht----- > Von: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.
2019-02-06 by jaccoville@yahoo.com
Could I get a manual how to calibrate ( tracking etc) I’m familiar with calibration processes.
2019-01-30 by Roberto Sopracasa
Thanks a lot. I didn’t see it Thanks Roberto Sopracasa > Il giorno 30 gen 2019, alle ore 11:01, yahoo@doepfer.de [Doepfer_a100] ha scritto: > > Please refer to the Doepfer website: > > www.doepfer.com > English > PRODUCTS > A-100 > Module Overview > A-111-1 > > adjustment procedu
2019-01-30 by yahoo@doepfer.de
Please refer to the Doepfer website: www.doepfer.com > English > PRODUCTS > A-100 > Module Overview > A-111-1 > adjustment procedure Best regards Dieter Doepfer > -----Ursprüngliche Nachricht----- > Von: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com] > Gesende
2019-01-30 by roberto.sopracasa@gmail.com
Hi everybody I accidentally gave the 220v to the modular chassis that burned the cem of my A-111s. I replaced them but I do not know how to calibrate them. Is there a tutorial somewhere to do this? Best regards Roberto Sopracasa