sbelyo Posted November 17, 2013 Report Posted November 17, 2013 I'm thinking about using the 4 gang ALPS pot for my dynahi. I want to mount it on a pcb but I don't see any available so I thought if I took two epsilon 27 boards I could make one. The first board would fit the front, the second board looks like it would need the front trimmed off to fit the back section. The grounds are tied together on those boards so I'm not sure how that comes into play since I've never wired a pot for balanced audio before. How do you wire a volume pot for balanced audio and do you think this would work?
n_maher Posted November 17, 2013 Report Posted November 17, 2013 It might be easier to just use perf-board if the pin spacing matches up. Otherwise I'd just neatly air wire it and not worry about pcbs.
kevin gilmore Posted November 17, 2013 Report Posted November 17, 2013 i can whip up a board if you want to have some made. birgir has boards for the alpha pots
nikongod Posted November 17, 2013 Report Posted November 17, 2013 When building balanced amps I use a 2-deck pot with shunt resistors.
kevin gilmore Posted November 17, 2013 Report Posted November 17, 2013 does not work with some sources. ends up with a dc offset, or causes issues like eddie current has with the electra
sbelyo Posted November 17, 2013 Author Report Posted November 17, 2013 It might be easier to just use perf-board if the pin spacing matches up. Otherwise I'd just neatly air wire it and not worry about pcbs. that's what I was going to do at first. I'll get the pot first and see if I have anything that fits
sbelyo Posted November 17, 2013 Author Report Posted November 17, 2013 i can whip up a board if you want to have some made. birgir has boards for the alpha pots Thanks Kevin, that would be cool. screw terminals on the output would be nice. I'd do a small board run for that.
kevin gilmore Posted November 17, 2013 Report Posted November 17, 2013 is each section 10mm from the next, and hole size or a pdf of the quad pot
cetoole Posted November 17, 2013 Report Posted November 17, 2013 does not work with some sources. ends up with a dc offset, or causes issues like eddie current has with the electra What causes this? Any examples circuits which have this issue?
sbelyo Posted November 18, 2013 Author Report Posted November 18, 2013 is each section 10mm from the next, and hole size or a pdf of the quad pot yes, hole size is 1.2mm based on the diagram here http://www.ebay.com/itm/260964413265?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649
kevin gilmore Posted November 18, 2013 Report Posted November 18, 2013 like this http://gilmore.chem.northwestern.edu/rk27quad.jpg
spritzer Posted November 18, 2013 Report Posted November 18, 2013 The quad ALPS layout we used on the Megatron works perfectly as a reference.
n_maher Posted November 18, 2013 Report Posted November 18, 2013 On further reflection I wouldn't recommend using an RK27 for a balanced dynahi. Find something better.
sbelyo Posted November 18, 2013 Author Report Posted November 18, 2013 like this http://gilmore.chem.northwestern.edu/rk27quad.jpg Yeah, that looks perfect. When hooked up where do I connect the ground?
sbelyo Posted November 18, 2013 Author Report Posted November 18, 2013 (edited) On further reflection I wouldn't recommend using an RK27 for a balanced dynahi. Find something better. Yeah I know... I really want a gold point in there but I just want to get sound out of it at this point. Plus I just blew my wad on a set of SR200's Edited November 18, 2013 by sbelyo
spritzer Posted November 18, 2013 Report Posted November 18, 2013 Yeah, that looks perfect. When hooked up where do I connect the ground? All of the ground connections are shared so anywhere with GND next to it.
sbelyo Posted November 18, 2013 Author Report Posted November 18, 2013 All of the ground connections are shared so anywhere with GND next to it. Do I connect it to chassis ground? or ground on the amp board?
kevin gilmore Posted November 18, 2013 Report Posted November 18, 2013 http://gilmore.chem.northwestern.edu/rk27quad.zip
sbelyo Posted November 18, 2013 Author Report Posted November 18, 2013 You are the man!!! anybody know of a good board house I can have a small run done at?
Pars Posted November 18, 2013 Report Posted November 18, 2013 I'm pretty sure I used a pair of these (though red) on the quad Alps I have, will check tonight. FT cheaper than having a board run done. http://www.ebay.com/itm/like/251069334948?lpid=82
sbelyo Posted November 18, 2013 Author Report Posted November 18, 2013 That was going to be my other choice. I was going to use two of AMB's boards
jezz Posted November 18, 2013 Report Posted November 18, 2013 If you can do with 3, I'd think OSH Park would work really well--probably $15-$20 for the size.
sbelyo Posted November 19, 2013 Author Report Posted November 19, 2013 (edited) http://gilmore.chem.northwestern.edu/rk27quad.zip oh no, a board outline file can't be found. help Edited November 19, 2013 by sbelyo
kevin gilmore Posted November 19, 2013 Report Posted November 19, 2013 not sure what software you are using, but this board file is the same as every other one I have done. may not be compatible with some panelizing software, but have produced thousands of boards with the software I use.
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