zei said:
I see now.........just now you said the pot can be substitute by a resistor. What values??? Is there's any different using this resistor compared to trimpot in term of SQ...? Do you think using a resistor is an alternative way to complete the power supply section without using a multi meter/volt tester?
gabanyayaya said:
Hi Gabanyayaya
You can use the following voltage calculator to help you determine the correct resistors
http://www.justblair.co.uk/lm317-voltage-calculator.html
(A shameless plug for Blair's website)
Regards
Richard
Strange.
It is an simple preamp with few parts so there are not many things you could check.. Is the supply generating a stady + - V ?
Besides that, how is the solderjoints?
Can you (or did you already..) go over the solderblobs again to make shure they are fine....
Did it ever work ok?
Did you place the pot on the input or output?
/JZ
It is an simple preamp with few parts so there are not many things you could check.. Is the supply generating a stady + - V ?
Besides that, how is the solderjoints?
Can you (or did you already..) go over the solderblobs again to make shure they are fine....
Did it ever work ok?
Did you place the pot on the input or output?
/JZ
The power supply is a steady + & - 15v. I will thoroughly check the solder joints with a magnifying glass.
Phono signal in to SOAP, output of SOAP to pot, then output of pot to phono outs
However you have not said whether there is any DC blocking on the PCB?
Have you ever measured any DC on this board?
Phono signal in to SOAP, output of SOAP to pot, then output of pot to phono outs
However you have not said whether there is any DC blocking on the PCB?
Have you ever measured any DC on this board?
gabanyayaya said:
Wow...this sure is helpful. Thanks Tripmaster. Funny though because I used to talk each other with Mr. Blair few months ago but not about chipamp but a speaker modding and I did what he told me about my speaker...
Hey, Get back in touch anytime, cant remember what you did with the speaker, I might fair better if I work out your real name (email) how did you get on?
gabanyayaya said:
I can confirm, the calculator works for the 337, and also the negative varients as well.
Sorry to hear your preamps puzzling you puffin.
Oh and thanks for the shameless plug trip!
Ok, the Cap on the output should take care of any DC, And i also think you have a cap on the inout of that poweramp?
You are supposed to have the pot on the input of the preamp.
It works with the pot on the output but i think it can create a somewhat strange load for the poweramp.
I have run mine for a long time withoute any funny stuff. And no, i have,nt messured any DC on the output. thats no garantie ofcourse.
But to be shure on what happened. You just played some music and then poff? one channel dead? Or did it happened when you powered it up?
What was it that made you test/play with it? what kind of trouble?
Yea, check the solderjoints and also reheat them if possible.
/JZ
You are supposed to have the pot on the input of the preamp.
It works with the pot on the output but i think it can create a somewhat strange load for the poweramp.
I have run mine for a long time withoute any funny stuff. And no, i have,nt messured any DC on the output. thats no garantie ofcourse.
But to be shure on what happened. You just played some music and then poff? one channel dead? Or did it happened when you powered it up?
What was it that made you test/play with it? what kind of trouble?
Yea, check the solderjoints and also reheat them if possible.
/JZ