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fonik
Joined: Jun 07, 2006
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 Posted: Tue Jun 22, 2010 11:19 pm Post subject:
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you seem to have several problems (two at elast), so let us try to narrow them down.
| tommi wrote: | | I 've clocked it with an lfo's square wave and it's ok. But when i set the switches to the ADC position nothing happens... |
so the actual sequencer section works? you can switch on/off the steps manually?
if yes, then:
| Quote: | | i 've only got step 8 hi and all others low, and nothing changes if i move the fine and coarse knobs or if i feed a signal to the adc input. The voltage status leds are working. |
only step 8 hi would be the last possible of the 256 gray coded patterns.
so the ADC seems to work, but not in the correct range. did you try T1 yet? it sets the reference voltage, thus the working range of the ADC.
i will re-check the values of R36/R37 again. looks suspicious.
do you have a scope to check the 40106 (IC5A) clock for the ADC?
BTW did you check the wiring of the switches? i.e. does step switch 1 in ADC position connect IC13/pin3 to IC8/pin5?
that's the ADC part. now to the CV out problem:
| Quote: | | Gate and trigger out and associated leds are working. |
good
| Quote: | | I've connected the cv out to an oscillator and it seems that the cv pots have no effect on the output. The oscillator controlled by the cv out is flopping between two semitones like, say: step1: C, step2: C#, step3: C, step4:C#, etc etc.. |
set all steps on manually and measure the voltages at pins 1, 4, 8 and 11 of ICs 11 and 12 (the quad switches). this will be the voltage that will be switched on to the potentiometers. obviously the 4016 switches work, otherwise the step LEDs won't work.
if these voltages are in the expected range (10V?) move forward and measure the voltages at the potentiometers wipers (for the 4017 don't use a clock, but manual step). just follow the voltage through the circuit...
(the 4017 just controlls the 4016 quad switches. the quad switches apply the buffered voltages to the step LEDs, the gate/trigger outs and the potentiometers. the voltages from the potentiometers then are summed through RN2 and IC9 with it's associated resistors).
triple check the wiring.
let us know about your findings.
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matthias
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tommi
Joined: Dec 05, 2007
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| Posted: Wed Jun 23, 2010 1:43 am Post subject:
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I was checking on the scope i got at my work for the clock output from the 40106. Here i got a +/-15V power supply.
It seems that the adc is working now that i put +/-15V. When i change the adc fine and coarse knobs i see the pattern steps moving. Could it be a voltage issue?
Even at 12V i can switch the steps on manually.
I checked that the 40106 is outputting a square wave at pin 2. Ok
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fonik
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| Posted: Wed Jun 23, 2010 2:11 am Post subject:
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| tommi wrote: | I was checking on the scope i got at my work for the clock output from the 40106. Here i got a +/-15V power supply.
It seems that the adc is working now that i put +/-15V. When i change the adc fine and coarse knobs i see the pattern steps moving. Could it be a voltage issue?
Even at 12V i can switch the steps on manually.
I checked that the 40106 is outputting a square wave at pin 2. Ok |
the ADC is powered by the 5V. however, the 40106 is not. i wonder if you see a clock with 12V. the clock should go from lower than 1V to more than 3V, i believe.
which ADC are you using?
BTW for 12V operation the reference for the comparator will have to be changed: R74 150k approx., R75 110k approx. something along these lines. you want approx. 5V at IC4B/pin6. however, this is not a major issue.
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matthias
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tommi
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| Posted: Wed Jun 23, 2010 2:27 am Post subject:
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I just can say that with 15V there is a clock wich is surely from lower than 1V to more than 3V. I can't say what happens when I am on the 12V power cause at home I have no scope.
I am using the ADC0804LCN.
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fonik
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| Posted: Wed Jun 23, 2010 2:39 am Post subject:
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okay, so far we can say that there is no error in your built of the ADC part itself, and it works with 15V. correct? 
tomorrow night i will have some time to try 12V on the unit i built, and to look at it with the scope. thanks for your patience.
maybe meanwhile you could look at the other issue (CV out)?
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matthias
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tommi
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tommi
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| Posted: Wed Jun 23, 2010 3:47 am Post subject:
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Looking at the schematics, i have a doubt about tying the ccw pin of the cv pots to +5V like per wiring scheme. On schematics, page 2 the example of the CV pot shows that its ccw pin is tied to ground, isn't it?
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fonik
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| Posted: Wed Jun 23, 2010 4:46 am Post subject:
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| tommi wrote: | | Looking at the schematics, i have a doubt about tying the ccw pin of the cv pots to +5V like per wiring scheme. On schematics, page 2 the example of the CV pot shows that its ccw pin is tied to ground, isn't it? |
ABSOLUTELY! what did i think? 
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tommi
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fonik
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| Posted: Wed Jun 23, 2010 5:58 am Post subject:
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| tommi wrote: | | Great! So i maybe solved the CV problem. Could my ADC fault be linked to that? I 'm afraid not... |
actually not. the potentiometers are not connected to the ADC directly, despite the 5V rail. and it worked powered by 15V, didn't it?
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tommi
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| Posted: Wed Jun 23, 2010 6:05 am Post subject:
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Yes, yes, it worked. At least, visually the pattern leds, with all switches set to ADC, were moving according to the ADC's offset and fine knobs.
With 12V, same switch setting, i had only step 8 hi and all others low, and nothing changed when i moved the ADC knobs.
So i can say that at 15V the ADC is working.
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LektroiD
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| Posted: Wed Jun 23, 2010 10:17 am Post subject:
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I'd be interested in a couple of boards if possible?
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tommi
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| Posted: Wed Jun 23, 2010 10:41 am Post subject:
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I have tied the ccw pins of the CV pots to ground and checking the result home.
The cv out now is working ok.
My last problem remains the ADC part, wich is what makes this sequencer unique! I thought about the applications it should have and it would be great to have it working...
I checked R36 and 37 and they are respectively 200K and 1K as suggested for 12V operations. I 've tried tweaking the trimmer, but nothing changes in the adc from cw to ccw.
I am able to turn hi the steps manually.
I have no clue about why it works at 15V and it doesn't at 12V! I got +5V for the adc and the other ICs. Maybe the 40106 with the same cap+res configuration is outputting another frequency at 12V and so it isn't clocking properly the 0804?
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fonik
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| Posted: Wed Jun 23, 2010 10:54 pm Post subject:
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| tommi wrote: | | I have no clue about why it works at 15V and it doesn't at 12V! I got +5V for the adc and the other ICs. Maybe the 40106 with the same cap+res configuration is outputting another frequency at 12V and so it isn't clocking properly the 0804? |
my gut feeling tells me it's the clocking, however the freq is not that important. we will see tonight...
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matthias
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LektroiD
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| Posted: Thu Jun 24, 2010 12:16 am Post subject:
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I responded in the ring mod thread over at Muff's too regarding these boards, yet all my posts have been ignored. Why do I get the distinct feeling someone doesn't want to sell them to me? I have a good track record with everyone here when it comes to buying boards too.
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fonik
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| Posted: Thu Jun 24, 2010 12:33 am Post subject:
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| LektroiD wrote: | I responded in the ring mod thread over at Muff's too regarding these boards, yet all my posts have been ignored. Why do I get the distinct feeling someone doesn't want to sell them to me? I have a good track record with everyone here when it comes to buying boards too.
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Hi R.,
obviously i did not read you post over at MW thoroughly, i thought you wanted to express interest in the ringmod PCB (which i take no orders for yet). i am sorry, my fault.
regarding the VCPS-8 PCB: i would love to sell you some PCBs, but all boards are spoken for (at the moment). however, there are PCBs still waiting for payment. i planned to try to contact these 18(!) customers next week concerning a dead line.
so i will put you on a waiting list, you will be #3.
my apologies.
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matthias
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tommi
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| Posted: Thu Jun 24, 2010 4:07 am Post subject:
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This morning i powered it with a +/-12V supply (the one wich comes with Doepfer DIY kit #2. It's 500mA per rail). It worked!
Could it be a current issue?
The supply where the ADC is not working is a 1200mA from Doepfer too, mounted on a double 84hp case full of modules... it seems strange to me that there's not enough current to feed them all, considered that the same supply is used on triple 84hps...
Fonik, do you know how current does it drains?
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fonik
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| Posted: Thu Jun 24, 2010 4:38 am Post subject:
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i am glad it's working now! don't forget to adjust the values of R74 and R75:
| fonik wrote: | | BTW for 12V operation the reference for the comparator will have to be changed: R74 150k approx., R75 110k approx. something along these lines. you want approx. 5V at IC4B/pin6. however, this is not a major issue. |
you may want to use an online calculator to do this.
i will measure the current draw tonight.
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matthias
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tommi
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| Posted: Thu Jun 24, 2010 7:47 am Post subject:
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I am sorry to say that it's not REALLY working. I mean that maybe before i was noticing that in adc mode the lights were moving. But looking better they are unstable, i mean they are rapidly blinking on and off (not completely on neither completely off).
I measured the ref voltage for the adc and his range, both in 12 and 15 volts and it's the same:
at +/-15V min. 1,190V max. 2,477
at +/-12V the same identical values.
Is it normal?
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tommi
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| Posted: Thu Jun 24, 2010 8:02 am Post subject:
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Ooops... I didn't realized that that divider was dividing +5V and not the positive rail supply. So i am not sure about the reason to lower R36 to 200K for 12V operation.
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tommi
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| Posted: Thu Jun 24, 2010 11:00 am Post subject:
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Fonik, now it's working! Really! I just changed socket on the Doepfer bus and it worked. I think it was a faulty socket.
I apologize for all the noise i made on this thread and I can confirm that it works perfectly even at 12V!
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fonik
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| Posted: Thu Jun 24, 2010 11:31 am Post subject:
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happyness! i am glad it's working now.
i am sorry about the wrong information about the limiting resistor, will have to correct this in the documentation. i fear i am a little bit nervy these days...
| tommi wrote: | | Ooops... I didn't realized that that divider was dividing +5V and not the positive rail supply. So i am not sure about the reason to lower R36 to 200K for 12V operation. |
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LektroiD
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| Posted: Fri Jun 25, 2010 8:27 am Post subject:
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| fonik wrote: | | LektroiD wrote: | I responded in the ring mod thread over at Muff's too regarding these boards, yet all my posts have been ignored. Why do I get the distinct feeling someone doesn't want to sell them to me? I have a good track record with everyone here when it comes to buying boards too.
|
Hi R.,
obviously i did not read you post over at MW thoroughly, i thought you wanted to express interest in the ringmod PCB (which i take no orders for yet). i am sorry, my fault.
regarding the VCPS-8 PCB: i would love to sell you some PCBs, but all boards are spoken for (at the moment). however, there are PCBs still waiting for payment. i planned to try to contact these 18(!) customers next week concerning a dead line.
so i will put you on a waiting list, you will be #3.
my apologies. |
Many thanks, if at all possible, I'd be interested in 2.
Rich
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