ruffrecords
Well-known member
Just had an email to say the PCBs have been shipped and should reach me Wednesday 4th May.
Cheers
Ian
Cheers
Ian
buschfsu said:any chance of getting two boards?
thanks
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ej_whyte said:So, know that i have the boards let me just clear up the jumpers/resistors.
Hi Switch:
R1 & R2 in
R3 Unconnected
Jumper L1 (assuming i don't want the inductor)
Low Switch:
Jumper R1 & R2
R3 = 56k
Jumper | near to R3
Jumper L1
Correct?
Also, here are my updated values for using stepped gain pots. I used 40dB as you suggested, and the graph curves seem much better.
ruffrecords said:ej_whyte said:So, know that i have the boards let me just clear up the jumpers/resistors.
Hi Switch:
R1 & R2 in
R3 Unconnected
Jumper L1 (assuming i don't want the inductor)
Low Switch:
Jumper R1 & R2
R3 = 56k
Jumper | near to R3
Jumper L1
Correct?
Yes, that seems right to me.
Also, here are my updated values for using stepped gain pots. I used 40dB as you suggested, and the graph curves seem much better.
Yes, they look good to me, the resistance is about 10% at the half way point as expected.
Just a note about capacitors. The PCB is laid out for 5mm pitch capacitors and I have checked that WIMAs are available in this spacing at the values required and at suitable voltage ratings (50 to 100V). However, where two capacitors are required, if one is a high value (say 330nF) it may not be possible to fit both side by side. Fortunately, the PCB is double sided so you can one on the other side of the PCB. I would like to claim I thought of this when I designed the PCB but I have to admit it only occurred to me later.
Cheers
Ian
ej_whyte said:Ok cool, thanks for the clarification.
I was just looking up all the caps on mouser, they have them all in stock except the 2.2nF and 330nF :/ Also, most of the caps are 63 or 100v, but with the smaller values they only had 630v in. I know its perfectly fine to have a higher value than required, and i thought the only disadvantage to larger voltage ratings was physical size, but i just wanted to check there wouldn't be any significant noise increase or any other disadvantage?
With 2 sets of caps for stereo, they come in at £23.65 by the way.
ruffrecords said:There should be no noise issues with higher voltage caps.
You did not mention what tolerance and make of caps you were looking up on Mouser.
I tend to use Rapid, which has the 2n2 in a WIMA but also is lacking the 330nF
Cheers
Ian
ej_whyte said:WIMA MKS4, 5% when they had them, otherwise 10%, did they have them all in 5% at rapid?
Cheers
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