EURO x0x-heart - Complete "Kit"

From circuitbending to homebrew stompboxes & synths, keep the DIY spirit alive!
Post Reply
User avatar
Brueckenstein
Learning to Wiggle
Posts: 33
Joined: Mon Nov 21, 2016 2:36 pm
Location: Germany
Contact:

Post by Brueckenstein »

guest wrote:
from a regular listening perspective, i plugged a pair of headphones into the VCA out and the noise wasnt too noticeable at high cutoff, and very, very noticeable at low cutoff. at low cutoff, the noise sounds about half as loud as the original signal (although from a measurement perspective, this is not the case, see above). the noise doesnt actually change any as cutoff is moved, the main signal just gets larger, so its less noticeable. all of this is consistent with my 303 as well.
i think i´ve been a bit too harsh ...
after spending intense time with this guy i became warm.
i like the strange behavior between the gates, frequency and resonance.
the noise just disturbs while using a too clean signal and there is a lot of volume potential with gating and accentlng.

but maybe one thing,
how to lower the internal clipping range while resonance is down?
User avatar
guest
Super Deluxe Wiggler
Posts: 8304
Joined: Mon Aug 19, 2013 11:49 am

Post by guest »

the mix between resonance and non-resonance signals are set with R30 and R34. R34 is the non-resonance signal (main level) and R30 is the resonance signal. so if you want to have less volume with no resonance, increase R34 and maybe decrease R30. but, this is just for the VCF out. the main audio pathway volumes are set with R121 and R121 on the x0x-heart. R121 is the non-resonance control, and R122 is the resonance control. so once you have a good resistor ratio picked for the VCF out, you can mimic that resistor ratio for the VCA output. note that the ratio of R34:R30 is about the same as R121:R122, but the absolute values are lower for R122 and R121.
openmusiclabs.com
User avatar
Nyon-k
Learning to Wiggle
Posts: 10
Joined: Sun Jan 08, 2017 3:45 pm
Location: Barcelona, Spain

Post by Nyon-k »

Hello

I have finished mounting my x0x module but there is no sound

We have been more than 3 hours in the Befaco workshop in Barcelona with a professional technician testing and we have checked:

- ICs
- Resistors
- Cable Connections
- Regulator
- Welding in general

Everything is mounted cleanly and we can not think what the problem might be

any ideas?

Thanks in advance and sorry for my poor english

Sergio
User avatar
guest
Super Deluxe Wiggler
Posts: 8304
Joined: Mon Aug 19, 2013 11:49 am

Post by guest »

is this x0x-heart and pacemaker? is there 5.33V and 12V on the x0x-heart? is there +/-12V and 5V on the pacemaker? is there any sound out of the VCF? are you applying a CV of greater than 1V?
openmusiclabs.com
User avatar
Nyon-k
Learning to Wiggle
Posts: 10
Joined: Sun Jan 08, 2017 3:45 pm
Location: Barcelona, Spain

Post by Nyon-k »

Hello
Thank you for answering so quickly
I have access to professional tools every Thursday in the Befaco workshop

Is this x0x-heart and pacemaker?
- yes, it's the kit, Heart and Pacemaker

Is there 5.33V and 12V at the x0x-heart?
- I will check this again

Is there +/- 12V and 5V in the pacemaker?
- I will check this again

Is there any sound outside the VCF?
- do not

Are you applying to CV of more than 1V?
- yes, we have applied CV / Gate

A friend has loaned me an x0x module that works to make comparisons

Next Thursday I will go back to the cave to apply your advice, in case you can think of anything else

Thanks !!!, Sergio
User avatar
Nyon-k
Learning to Wiggle
Posts: 10
Joined: Sun Jan 08, 2017 3:45 pm
Location: Barcelona, Spain

Post by Nyon-k »

guest wrote:is this x0x-heart and pacemaker? is there 5.33V and 12V on the x0x-heart? is there +/-12V and 5V on the pacemaker? is there any sound out of the VCF? are you applying a CV of greater than 1V?
Hello

Yes 5.33v Heart, but I have looked at the schematic where to measure 12v and I have not found it, can you tell me where I can measure it?

Thank you, Sergio
User avatar
guest
Super Deluxe Wiggler
Posts: 8304
Joined: Mon Aug 19, 2013 11:49 am

Post by guest »

J4 pin1 is 5.333V, and J4 pin3 is 12V.
openmusiclabs.com
User avatar
Nyon-k
Learning to Wiggle
Posts: 10
Joined: Sun Jan 08, 2017 3:45 pm
Location: Barcelona, Spain

Post by Nyon-k »

Hello
Okay, I'll check it for tomorrow

Thanks!, Sergio
User avatar
Nyon-k
Learning to Wiggle
Posts: 10
Joined: Sun Jan 08, 2017 3:45 pm
Location: Barcelona, Spain

Post by Nyon-k »

guest wrote:J4 pin1 is 5.333V, and J4 pin3 is 12V.
Hello
In J4 I do not have 5v or 12v reading :help:

What do you advise me?

Thanks in advance
User avatar
guest
Super Deluxe Wiggler
Posts: 8304
Joined: Mon Aug 19, 2013 11:49 am

Post by guest »

what are the voltages on all pins of U2? its a small IC, so be careful when touching pins to measure the voltages.
openmusiclabs.com
User avatar
Nyon-k
Learning to Wiggle
Posts: 10
Joined: Sun Jan 08, 2017 3:45 pm
Location: Barcelona, Spain

Post by Nyon-k »

Hello

from left to right
1 = 2.3V
2 = 3.55V
3 = 2.3V
4 = 1V
5 = 0
6 = 0
7 = 5V

Thank you very much, Sergio
User avatar
guest
Super Deluxe Wiggler
Posts: 8304
Joined: Mon Aug 19, 2013 11:49 am

Post by guest »

there should be 8 pins on U2. typically, pins are labelled starting in the upper left corner, going down the left side, and then back up the right side:

1 |V| 8
2 | .| 7
3 | .| 6
4 |_| 5
openmusiclabs.com
User avatar
guest
Super Deluxe Wiggler
Posts: 8304
Joined: Mon Aug 19, 2013 11:49 am

Post by guest »

also, what is the voltage on J1 pin11,12. these are the 2 pins that are 3rd from the bottom on the main header. these should be at 5V. on DIP headers, pins are labelled across and then down:

1[++]2
3[++]4
5[++]6
7[++]8
...
openmusiclabs.com
User avatar
Nyon-k
Learning to Wiggle
Posts: 10
Joined: Sun Jan 08, 2017 3:45 pm
Location: Barcelona, Spain

Post by Nyon-k »

Hi
guest wrote:there should be 8 pins on U2. typically, pins are labelled starting in the upper left corner, going down the left side, and then back up the right side:
Sorry I was looking at the pacemaker's U2

In the U2 of the Heart I have

1 = 0 / 2 = 0 / 3 = 5.56V / 4 = 1V
5 = 0 / 6 = 0 / 7 = 5V / 8 = 0

In J1 pin11,12 I have 5V

thanks for your attention, Sergio
User avatar
guest
Super Deluxe Wiggler
Posts: 8304
Joined: Mon Aug 19, 2013 11:49 am

Post by guest »

can you double check pins 4 and 8. those should be 0v and 15V. given what some of your other voltages are, im suspecting there is a misreading there. pin4 is directly connected to ground, so that should always be 0V. pin8 is the powersupply, and if that wasnt working, you wouldnt get 5.56V on pin3. keep the negative probe on pin2 of J4. if you still dont find any voltage on pin8 of U2, check the voltage across C7. it might be that there is a bad solder joint on U2, or a broken trace.
openmusiclabs.com
User avatar
Nyon-k
Learning to Wiggle
Posts: 10
Joined: Sun Jan 08, 2017 3:45 pm
Location: Barcelona, Spain

Post by Nyon-k »

guest wrote:can you double check pins 4 and 8. those should be 0v and 15V. given what some of your other voltages are, im suspecting there is a misreading there. pin4 is directly connected to ground, so that should always be 0V. pin8 is the powersupply, and if that wasnt working, you wouldnt get 5.56V on pin3. keep the negative probe on pin2 of J4. if you still dont find any voltage on pin8 of U2, check the voltage across C7. it might be that there is a bad solder joint on U2, or a broken trace.
Hello
Sorry yesterday should be too late for me and I did not read well, as you say

Pin3 = 5V
Pin4 = 0
Pin8 = 15V

In J1 pin11,12 I have 5V

thanks for your time
User avatar
guest
Super Deluxe Wiggler
Posts: 8304
Joined: Mon Aug 19, 2013 11:49 am

Post by guest »

is this a recent purchase from synthcube? if so, you should contact them and let them know about the problem. it looks like U2 is bad. if you have the ability to do SMT rework, you could probably fix it yourself, but im betting the other opamp is also bad.
openmusiclabs.com
User avatar
Nyon-k
Learning to Wiggle
Posts: 10
Joined: Sun Jan 08, 2017 3:45 pm
Location: Barcelona, Spain

Post by Nyon-k »

Hello

Yes, I bought the kit last month, I'll get in touch today

Thank you very much for your help and I hope my next message is that my x0x is mistreating my neighbors!

Greetings, Sergio
User avatar
Nyon-k
Learning to Wiggle
Posts: 10
Joined: Sun Jan 08, 2017 3:45 pm
Location: Barcelona, Spain

Post by Nyon-k »

guest wrote:is this a recent purchase from synthcube? if so, you should contact them and let them know about the problem. it looks like U2 is bad. if you have the ability to do SMT rework, you could probably fix it yourself, but im betting the other opamp is also bad.
Hello

I already have my x0x screaming in my case

Thanks for the acid!

Greetings Sergio
User avatar
guest
Super Deluxe Wiggler
Posts: 8304
Joined: Mon Aug 19, 2013 11:49 am

Post by guest »

thats great news!
openmusiclabs.com
User avatar
heapish
Veteran Wiggler
Posts: 546
Joined: Mon Mar 11, 2013 5:27 pm
Location: Lancashire UK

Post by heapish »

Just about to calibrate... 1 question.
Red line on the ribbon to the pin marked 1?
User avatar
heapish
Veteran Wiggler
Posts: 546
Joined: Mon Mar 11, 2013 5:27 pm
Location: Lancashire UK

Post by heapish »

Never mind. I found the schem. Yup red line to pin 1.
User avatar
heapish
Veteran Wiggler
Posts: 546
Joined: Mon Mar 11, 2013 5:27 pm
Location: Lancashire UK

Post by heapish »

Stupid question, but do I need a special screwdriver? I've knackered one trimmer and nothing I have seems to work.
User avatar
heapish
Veteran Wiggler
Posts: 546
Joined: Mon Mar 11, 2013 5:27 pm
Location: Lancashire UK

Post by heapish »

Never mind. Found a shallow one.
User avatar
heapish
Veteran Wiggler
Posts: 546
Joined: Mon Mar 11, 2013 5:27 pm
Location: Lancashire UK

Post by heapish »

For anyone late to the party quick summary plus what I think is a tip.
Calibration.
Install temporary male to female jumpers for J8, Tune, Cut off and Res1.
TM5 is scale
TM4 is pitch

I found that turning TM5 to it's bottom limit then up a tiny bit puts you in the area you need to be on both the ones I calibrated. Also, I found it's easiest to tune the 1v note up and checking with 2v. You have to split the difference. When I did it the other way, I seemed to chase my tail.
When you get it near. Tune with TM4 the go back again and get it nearer by jumping between 4v and 2v. You can get it really accurate.
Post Reply

Return to “Music Tech DIY”