Paradise Builders

[pdul]

the solderings look good, and whats the chance of making bad solderings in the same place, on two such big boards

 

[pdul]

With the opamps in, both measures the same

 

[pdul]

The sailing offset of +/- 100mv as if it were slowly sampling a sinus

 

[pdul]

We now have an ADconverter with a sampling frequency of 0,1 HZ

 

[hesener]

which opamps are you using? sounds like it is oscillating with the servo cutoff frequency.... I used OPA134 with great results. I think Joachim mentioned once that they need to be FET inputs.....

 

[pdul]

Opa 134 and i have tried AD711 briefly just for the experiment

 

[pdul]

Both fet inputs

 

[pdul]

I have now tried to change the 1uf bypass of the opamp to 220nf, and the offset is still wandering, but with only +/-50mv

 

[RCruz]

Cool.... If you get it to + - 10mV it might not be audible

 

[RCruz]

I have been measuring the output of my running paradise and it wonders between +12mV and -5mV.... It sounds wonderfully as is.

 

[pdul]

I am kind of itchy too to try it for real, i might try it with caps on the output untill the problem is solved

 

[pdul]

I am shure it amplifies, when i measure ac on the output, and at the same time touch the input, the measurement goes out of scale.

 

[hesener]

Does the output voltage fluctuate when you blow air on the input stage? It could be caused by the air around the transistors changing in temperature....

 

[pdul]

I will try that

 

[pdul]

Does the output voltage fluctuate when you blow air on the input stage? It could be caused by the air around the transistors changing in temperature

It actually have a lot of impact, to blow air onto the boards, on the input and even more so, on the mirrors, so i will experiment with thermic shielding/compensation. Thanks for the input

 

[Benedetto]

Germans only

 

[hesener]

Yes, there is some background work ongoing, to translate the assembly guide into german. Sorry I would have done it myself but I figured you would want to have your boards quickly

It makes a lot of sense, given that a large number of boards actually goes to Germany.....

By the way, the first batch of boards + components is out the door, was picked up today. I think I can send the rest out this week, since next week is Electronica trade show here in Munich, and I will be busy.....

 

[Benedetto]

Sorry I would have done it myself ...

You dont need to apologise,
youve contributed more than enough to all of us !

Last weekend we talked a bit at Krefeld and there will
be some progress soon...

 

[pdul]

Hi.
I guess this question is for hesener.
Are the boards double or trible layer? Meaning, are there any hidden traces inside, that i can damage, if i will drill some holes, for cableties?

 

[Benedetto]

Double !