I ran into issues with my boards when in the reflow oven. I've set them aside until I have time to get a better oven control running.
I hate hand soldering SMD. It's way too time consuming to align all the pieces individually. I'd prefer through hole for that.
I've done home etched boards for years in a toaster oven. Parts would align themselves while in the oven. Since I've gotten lazy and get my boards etched in China, I've ran into problems with components moving completely out of place and my boards are browning. I've got a better temperature controller 3/4 built to run the oven. I may need to use paste stencils for solder too.
I've done home etched boards for years in a toaster oven. Parts would align themselves while in the oven. Since I've gotten lazy and get my boards etched in China, I've ran into problems with components moving completely out of place and my boards are browning. I've got a better temperature controller 3/4 built to run the oven. I may need to use paste stencils for solder too.
Years ago i bought a microcontroller, from elektor ,for use in A reflow oven but never finished this project.
2x15 V AC is good choice, 2x18 V could produce to much heat on the CCS MOSFET (depends of the heat sink you choose). I use 2x15 V in my GainWire.
J1,J2,J3 schematics & pcb(FOOTPRINT) don't match. What is the right one?
Please look at the picture J1=2sk117 ,J3,J2=BF245A.
Please look at the picture J1=2sk117 ,J3,J2=BF245A.
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J2 and J3 originally are 2N5457 and the footprint is OK for them, if you want to use BF245A you should rotate for 180 degree.
You know that a drain and a source are interchangeable for JFETs. You can rotate 2SK170 or leave it as it is, it will still work. It was to late to change silk screen when I ordered the board.
Ok ,so i can power this using the original power supply this afternoon .
I want say thanks to Jeff, who sent me 4 pieces DN2540 for free.
I want say thanks to Vallery, who sent me 4 pieces 2sk117 for free also.
A great thanks to Damir of course ,who offer the schematic .
Best Regards.
Thimios.
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Take care, it looks like one of the transistors should be upside down in one channel, comparing to the other.
Are you talking about J 1?
It is a JFET 2sk117. Drain and source are interchangeable. Any disadvantage?
Thanks for your interesting!
Mk2 stereo
Testing GainWire stereo CFA
Testing GainWire stereo CFA
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mk2 lower gain
A GainWire lower gain version(CFA mode) ,using RightMark software.
Please keep in mind ,this is what MY sound card measure.Probably the GainWire is much better!
A GainWire lower gain version(CFA mode) ,using RightMark software.
Please keep in mind ,this is what MY sound card measure.Probably the GainWire is much better!
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I wanted to ask you what's that 50Hz hump on the distortion graphs, and than I see different text "Please keep in mind ,this is what MY sound card measure.Probably the GainWire is much better" ?
How is that possible?
edit: after I quoted you I can see complete text?????
This 50Hz hum is something i see always when testing with my p.c. I don't know why🙁
My sound card is an esi julia (pci).
I'm sure with a better sound card the GainWire will measure even better.(lower distortion)
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