Noise section trimmer voltage?

Seconded: I also could only get a min of about 300mV. I first tried a 27k i found for R127 in place of 4k7... it wasn't enough. Changed to 47k then i was able to adjust the measurement to 130mV RMS.

Sounds like a few people have found the same so perhaps the values should be changed in the kit. Alternatively the instructions could say to temporarily put in R127. This would save having to desolder it.

hi guys,
I am still having trouble with the correct value of the trimmer. I have checked everything and to my knowledge all is good.
First I had a 47K resisitor at R127 (because of the picture) with getting the maximal value of 118/120mV.
Now I have changed R127 for a 4K7 resistor wich gives a minimal value of 170/168mV.
What to do now?
I would like to have TM4 somewhere in the middle setting, so I can tweak it up or down.
Should I get a trimmer like "lfo2vco" did? And what value should this trimmer have for my prefered TM4 setting?

Shiva Niet wrote:First I had a 47K resisitor at R127 (because of the picture) with getting the maximal value of 118/120mV.
Now I have changed R127 for a 4K7 resistor wich gives a minimal value of 170/168mV.
What to do now?

Try with 22K

Best regards,
e-licktronic

Shiva Niet wrote:Should I get a trimmer like "lfo2vco" did? And what value should this trimmer have for my prefered TM4 setting?

Hi Shiva Niet,

I planned to use a 100k trimmer, but the guys at Maplin gave me a 1M by mistake. However this served the purpose of finding the right value without keep soldering and de-soldering loads resistors. Now my Yocto is up and running I will replace the trimmer with a 100K resistor (this is the closest value to where my trimmer currently set).

Hope this helps.

@4teenth, being organized takes time but it has its own rewards. Also, when you do have a multi-meter, it takes less time to measure resistance than by calculating it using the rings. One can always get confused by the colours. Please ensure that you have a complete kit for stuffing a PCB before starting stuffing. Having components in different bags makes it easier for you to access them. Using a sticky tape with components is never recommended as the sticky material is an insulator.

Does this voltage change trough the build?

I had it on 130mV with 100K resistor on R127 when I finished the noise part but now when I finished the Rimshot this voltage is 140mV and can get it to 130mV.

Also when I trigger instruments with Arduino snaredrum sound like pop and rimshot doesn't work. Can this be related?

Thanks!

Ok got the professional multimeter and now I changed R127 to 4.7K to get 130mV. But still snaredrum and rimshot does not work. I will post my problems in another topic.

yeah it looks like roland changed the noise schematic at some point:

I might try to do the bottom one instead of what's indicated in the tutorial and see what I can get. Should be an easy substitution.

The highest I could get voltage was 50mV so I've reduced R127 to 2K7 and was then able to get 130mV. Will reducing R127 affect any thing else?

Kris

I can't get it to 130mV too, 160mV is the lowest i can get by turning the trimmer.

When i take a look at the yocto schematics it clearly says that R127 is 47kOhm instead of 4.7kOhm
stated in the build manual...