Members dot-dot-dot Posted February 17, 2006 Members Share Posted February 17, 2006 This is the fun stuff - input buffer, tuner mute, two TB loops and ABY outputs with isolation.The little board top right is the buffer - prevents pickup loading so you don't lose treble over long cable runs - and the bigger board top left is the isolation so you can't get a ground loop set up between the two amps.It's hardly Pete Cornish, but I'm quite pleased with this one. Link to comment Share on other sites More sharing options...
Members skr3ddy Posted February 17, 2006 Members Share Posted February 17, 2006 Looks nice. So one regular, common-ground output and the second one isolated (plastic jack). Are you using a transformer to do the isolated output; is that the black cube? I was going to make one for a guy that would have just been a passive deal with a transformer on one isolated output. I'm not sure how much signal loss that would have had, as I never ended up doing it (but have the parts ready...) Link to comment Share on other sites More sharing options...
Members dot-dot-dot Posted February 17, 2006 Author Members Share Posted February 17, 2006 Yup - I have a board design (and one board made up) for a double-isolated system, but I've yet to see a setup that needed more than just one output isolated. The black cube is indeed the transformer - an OEP one. Transformer choice is critical in a passive design - I couldn't get a good sounding solution that way, and even buffering the transformer side alone wasn't satisfactory, so my isolated ABY has an input buffer to split the signal without loss and a driver for the transformer too. That approach definitely works - I did have a couple of returns-for-modification of the first couple of isolated ABYs, but they're now good enough that Machinehead (fairly prominent UK guitar shop) have ditched various big-name ABYs in favour of mine. Which is obviously an enormous ego-boost, even if they only sell two or three a year! Most of my stuff is pretty obvious design-wise - simple, proven (even "cookbook") circuits that just sound good. I use a lot of LM386 chips (though the high-end variants) and generally try to minimise component count. You can see that there's plenty of slack on the wires in case a switch fails; perhaps less neat, but very fixable. Link to comment Share on other sites More sharing options...
Members Speeddemon Posted February 17, 2006 Members Share Posted February 17, 2006 looks very neat! What kind of buffer is it? The GGG IC buffer? I built one of those for a ABY box a while ago. While it's no proper splitting/isolating, it did prevent a loss of treble, when using the Y-mode. Link to comment Share on other sites More sharing options...
Members dot-dot-dot Posted February 17, 2006 Author Members Share Posted February 17, 2006 Nope - it's a standard single-rail op-amp follower. 1 chip, 3 caps, 4 resistors. All you need. I heart op-amp followers. Though, that said, I have no idea what the GGG thingy is - it could well be the same thing. Link to comment Share on other sites More sharing options...
Members Speeddemon Posted February 17, 2006 Members Share Posted February 17, 2006 Originally posted by dot-dot-dot Nope - it's a standard single-rail op-amp follower. 1 chip, 3 caps, 4 resistors. All you need. I heart op-amp followers. Though, that said, I have no idea what the GGG thingy is - it could well be the same thing. might be the same!3x 2M2, 2x 10 uF elco's, 1x 0,1uF input cap, around a TL071.I heart them too. and I really heart my new collection of miniature electrolytics! 4mm x 7mm is 'da {censored}!electrolytics were ALWAYS the parts that stood highest on my pcb's, but NO MORE! Link to comment Share on other sites More sharing options...
Members dot-dot-dot Posted February 17, 2006 Author Members Share Posted February 17, 2006 Nah - mine's 2x 1M, 2x 100k, 2x 1uF, 1x 10uF and a 5532. I think. I forget these things. Link to comment Share on other sites More sharing options...
Members zhivago Posted February 17, 2006 Members Share Posted February 17, 2006 very nice and useful! Link to comment Share on other sites More sharing options...
Members UncleDig Posted February 17, 2006 Members Share Posted February 17, 2006 Does this mean you're going to have time to reply to my request for a quote? Link to comment Share on other sites More sharing options...
Members The Gainster Posted February 17, 2006 Members Share Posted February 17, 2006 WOW...you have big talent!!!Everything you do is so nice.... Link to comment Share on other sites More sharing options...
Members dot-dot-dot Posted February 17, 2006 Author Members Share Posted February 17, 2006 Originally posted by UncleDig Does this mean you're going to have time to reply to my request for a quote? Oh, buggery. Yes - sorry! Link to comment Share on other sites More sharing options...
Members MonkeyKnifeFighter Posted February 17, 2006 Members Share Posted February 17, 2006 Originally posted by dot-dot-dot That thing is friggin' sweet. It looks sleek & fast. It looks like it's tearin' ass around the room. But it's not. It's standing still.~MkF!"Hotdoggin' it!" Link to comment Share on other sites More sharing options...
Moderators AMZ-FX Posted February 18, 2006 Moderators Share Posted February 18, 2006 Very neat, Dot3! -Jack Link to comment Share on other sites More sharing options...
Members autopilot Posted February 18, 2006 Members Share Posted February 18, 2006 gorgeous, nice build Link to comment Share on other sites More sharing options...
Members Robbert Posted February 18, 2006 Members Share Posted February 18, 2006 It lacks the two-tone paint though. Link to comment Share on other sites More sharing options...
Members papa taco Posted February 18, 2006 Members Share Posted February 18, 2006 That just reeks of popping switches. Link to comment Share on other sites More sharing options...
Members skr3ddy Posted February 18, 2006 Members Share Posted February 18, 2006 Originally posted by papa taco That just reeks of popping switches. That's it! You sonovabitch. We are only allowed to say NICE things here now. You are {censored}ing banned, and your postcount.. will... be...Ah {censored} it. Not funny anyhow. Link to comment Share on other sites More sharing options...
Members papa taco Posted February 18, 2006 Members Share Posted February 18, 2006 Originally posted by skr3ddy That's it! You sonovabitch. We are only allowed to say NICE things here now. You are {censored}ing banned, and your postcount.. will... be... Ah {censored} it. Not funny anyhow. I found a pube in my Skreddy Mayo Sammich. Link to comment Share on other sites More sharing options...
Members Robbert Posted February 18, 2006 Members Share Posted February 18, 2006 Originally posted by papa taco I found a pube in my Skreddy Mayo Sammich. Hehe, surprise! Link to comment Share on other sites More sharing options...
Members UncleDig Posted February 18, 2006 Members Share Posted February 18, 2006 Originally posted by dot-dot-dot Oh, buggery. Yes - sorry! No problem I knew you were busy. Just let me know what you think.This one looks nice! Link to comment Share on other sites More sharing options...
Members The Gainster Posted February 18, 2006 Members Share Posted February 18, 2006 Originally posted by Robbert It lacks the two-tone paint though. I have a sander at hand!!! Link to comment Share on other sites More sharing options...
Members dot-dot-dot Posted February 18, 2006 Author Members Share Posted February 18, 2006 Actually, it is two-tone - the top is silver but the back and front are purple. Also just finished a router for Pin of Sikth. Celebrity-tastic! Link to comment Share on other sites More sharing options...
Members Narcosynthesis Posted February 18, 2006 Members Share Posted February 18, 2006 I am dissapointed in you Andi, such a nice big surface and no hint of a garish paintjob...(Or should that be surprise in the fact you managed to restrain yourself?)In other news, nice work, looks excellent David Link to comment Share on other sites More sharing options...
Members RoboPimp Posted February 18, 2006 Members Share Posted February 18, 2006 stunning work! Link to comment Share on other sites More sharing options...
Members dot-dot-dot Posted February 18, 2006 Author Members Share Posted February 18, 2006 Originally posted by Narcosynthesis I am dissapointed in you Andi, such a nice big surface and no hint of a garish paintjob... (Or should that be surprise in the fact you managed to restrain yourself?) Unfortunately this on was a request. Quite often I get "Anything but pink" - I've done a lot of lime green and orange units... Link to comment Share on other sites More sharing options...
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