I've just finished a phat Philter for my SK-1. It seems to be working reasonably well. However, it squeals like crazy. I didn't have any NE5443AN op-amps, so I...
552
noystois
Nov 6, 2009 7:40 pm
i dont think the values of those caps are too critical, they will just change the tone of the filter. the first thing you could try is adding a decoupling cap...
553
luke
icanfeelmyse...
Nov 7, 2009 5:58 pm
Thanks for that Tanner. I actually found the source of the problem... I'd placed all of the res pot wires after a trace cut instead of before it. A rookie...
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noystois
Nov 8, 2009 6:52 am
i dont know, ive never built it. it only turns off 10 minutes after you last touched the sk1 right? not while youre still playing? ive heard of people trying...
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luke
icanfeelmyse...
Nov 8, 2009 7:23 pm
There's an APO mod on Electri-Fire's site which works a treat. I've had the demo going for about 20 minutes and the crazy is setting in now... I don't think my...
556
luke
icanfeelmyse...
Nov 9, 2009 6:00 pm
The keys cut out after approx. 400 strokes. Which is rubbish. Any advice on this one? On the PPB, I replaced the 741s with 5534s and it has cut the squealing...
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gmeredith1
Nov 10, 2009 1:36 am
Hi Luke, Graham here, the designer of the Phat philter Bank. Sorry I missed your posts, gosh, I go away for a few days and this place gets exciting :D Glad you...
558
gmeredith1
Nov 10, 2009 1:45 am
Yes, I had a lot of problems too, trying to get the input gain down - the SK puts out a very hot signal. I found that just putting an input resistor or pot to...
559
gmeredith1
Nov 10, 2009 2:02 am
"I just wish I had quad gang pots. I'm using 2 pairs of dual gang and it's not ideal." I searched far and wide for a 4-gang pot and only ever found one...
560
luke
icanfeelmyse...
Nov 10, 2009 9:47 am
Hi Graham. Thanks for your numerous replies :) The PPB is great and I'm glad of it's size. If it were much bigger, it just wouldn't fit into the sk1. I'm...
561
gmeredith1
Nov 11, 2009 12:08 am
Hi Luke, I'm glad you resolved the hot 4th line, that's great! Perhaps when you get time you could show the connect points for the SK1 in a photo or something...
562
luke
icanfeelmyse...
Nov 11, 2009 2:52 pm
Hey Graham. Thanks for all the help thus far. the item number for the hex gang is; 290366887977 Hongkongsuperseller is the traders name. They're very cheap. ...
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gmeredith1
Nov 11, 2009 11:57 pm
Haha, well, I always think it's better to feel like a dumbass and have a working keyboard than the other way around! Regarding the insert point, yes, it is...
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luke
icanfeelmyse...
Nov 14, 2009 1:20 pm
Hey Graham. It's finished!!! I've not got any fresh batteries at the mo to test the PPB. It works well enough with an adaptor. The hum is only overpowering...
565
gmeredith1
Nov 16, 2009 10:37 am
Hey Luke, that's great news! Glad you liked it. It really turns the SK into a synthesizer, doesn't it! For the next mod, you really gotta try my "Slo-AD mod" -...
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luke
icanfeelmyse...
Nov 16, 2009 1:08 pm
I tried the Slo-Ad and it's great. Unfortunately, I didn't have the space to include this mod. I had to use center-off switches to get the most out of the...
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gmeredith1
Nov 17, 2009 6:44 am
You solved the hum issue, that's great! My workaround for this, now that I know what caused yours to hum, is to install rechargeable batteries in it (probably...
568
sevenismagic
Nov 25, 2009 2:50 am
hello all. i'm jamie, new here. i am new to the circuit bending scene. i have had some success bending a cheap HMP-139 keyboard, as well as unlocking some...
569
jeanbender@...
jeanbender...
Nov 30, 2009 12:53 pm
Hi everybody !! I'm new on this group, but i've already bent and done some circuit bent stuff ( http://virb.com/dead_beat ). Well; i'm going to bend my sk8,...
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gmeredith1
Nov 30, 2009 11:09 pm
Greencap capacitors are also called polyester film non-polar capacitors. They are commonly green but also come in red. blue and other colours. They can be...
571
jeanbender@...
jeanbender...
Dec 1, 2009 8:02 pm
Ok thanks you helped me a lot with this tip, and you helped me knowing something else... and that's great !! I've got another question now... Wher can i find a...
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gmeredith1
Dec 1, 2009 11:52 pm
The PPB guide was written for an SK-8. I presume your running an SK-1? The power tap point will be different in the SK-1. You will need to check with a...
573
jeanbender@...
jeanbender...
Dec 2, 2009 12:05 am
Oh, i'm working on a sk8... Well, i maybe made a mystake, i will fix it tomorrow. But i'm sure that i take the v+ from the LA 1438' power input pin . I should...
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gmeredith1
Dec 2, 2009 3:40 am
You have an SK-8, ok then that makes it easier to troubleshoot for me. I have my ground and +V taken from where it is in the PPB guide. Are you wiring up your...
575
jeanbender@...
jeanbender...
Dec 7, 2009 10:11 pm
Thanks for yours anwers, i made a small mystake in my wirings... Could you explain me what are differencies between metal film and polyester film capacitors ?...
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gmeredith1
Dec 7, 2009 10:32 pm
Metal film and polyester? - no difference in this circuit - if they're easier to get use them. Around where I am, polyester greencaps are really cheap and in...
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javierpuga
Dec 16, 2009 7:32 pm
The link to this thread is down. Does anyone know how to disable the auto power off on the sk-1?...
578
jeanbender@...
jeanbender...
Dec 31, 2009 11:46 am
Hi everybody !! First at all, happy new year.. Then, i'd like to ask you several questions ! I've put on my sk8 a pitch with the ltc1799 chip, and the lfo mod....
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Tim Fardell
derek_the_ra...
Jan 1, 2010 1:17 am
Is the buzz only present when using the power supply? If the buzz disappears when you use batteries, and is present even when using the internal speaker with...
580
steveglitch@...
steve_glitch218
Jan 1, 2010 1:33 am
Can somebody remove me from this please. Happy new year Sent from my U.S. Cellular BlackBerry® smartphone ... From: Tim Fardell <tim.fardell@...> ...
