Jump to content

jojjelito

Frequent Writer
 View Profile  See their activity

  • Posts

    1,483

  • Joined

  • Last visited

  • Days Won

    10

 Content Type 

Posts posted by jojjelito

  2. OPL3 Driver Issues

    in Testing/Troubleshooting

    Posted

    Wow - I had to double check that GBW figure. Let's just say that the TLV2244 needs to be replaced. It's been optimised for low power (TI talks about micropower application). The low Gain Bandwidth Product and the low slew rate means that this op amp will only work on signals up to 5.5kHz at 1.0 gain. Double the gain and you halve the maximum frequency.

     

    OK, so what will happen with signals with sharper edges (i.e higher frequencies)? If you're lucky they will become distorted (low pass filtered). The amount of ringing in the signals will vary, but you should consider testing an op-amp with better (ok different) specs - higher bandwidth. It will draw more power, but that shouldn't be a problem here.

  5. [B] GM5 Chip

    in Fleamarket

    Posted · Edited by jojjelito

    I have what I need, but if it helps, sign me up for 10 chips. Protip: make a Wiki interest-list where ppl pur down their forum names and quantity. I could pimp this at Mutable Instruments and a couple more DIY forums.

    Edit: signed up for 10 IC.

  6. MIDIbox SEQ V4Lite

    in MIDIbox SEQ

    Posted

    Oh Goody! I was going to make sth like this, but got sidetracked. A lot. Did you print this on paper and compared it to the PCB so that everything lines up etc? One shouldn't waste paper, but wasting 32€ plus pp and some plexi isn't nice either... Going to open this at work tomorrow in Inkscape to take a peek :D Cheers!

  14. ALBS Waldorf knobs bulk order January 2013

    in Bulk Orders

    Posted · Edited by jojjelito

    Hi Martin,

    The Soundwell encoders were reported by Wilba to be better for modification and be of higher quality than Bourns. Here is the old thread where the detent modification is shown:

    It would be a good idea to get at least the minimum amount (1000) of the EC162101ZXB-HA1, more specifically EC162101E1B with switch. The variant documentation is a bit confusing, unfortunately. Link here: http://en.soundwell.cn/newEbiz1/EbizPortalFG/portal/html/ProductInfoExhibit.html?ProductInfoExhibit_ProductID=c373e91a7c13d91a8f6acbc483ecd9ba&ProductInfoExhibit_isRefreshParent=false#

    It could be a great future bulk to save us building LED ring boards from buying crap encoders.

  15. ULN2803 Tester

    in Parts Questions

    Posted

    So, it's not a case of the magnets acting like coils? Do you have a coil spike suppression diode connected? Just thinking out loud here. There might be a bit of an inductive kick. Or, is there a short or current rush at some point of the switching pulse? Take this for what it is, I'm just leery of anything coil like. /J

  20. Control surface PCB for 16 encoders/LEDrings Bulk Order

    in Bulk Orders

    Posted

    Wonder if I dare order 130 of those Bourns encoders, or if I should look at importing 100 plus Soundwell encoders with switch myself? The 16mm ALPS encoders are obsolete, there is some remaining stock, but none with a switch as far as I can tell.

     

    If I had the time it would be interesting to evaluate a few different encoders and set up a bulk. Then again, getting the whole load from Mouser is convenient.

     

    Also, looking at 2x5mm LEDs at Mouser, there seem to be a lot of choice around 5 and 8mcd. There's also an 80mcd red model I guess you could use if you employ serious resistors (1k or more). Hmm...

  22. A silly question about knobs

    in Parts Questions

    Posted

    Aesthetics is one criteria, another one is ergonomics. In that respect I still find the Waldorf knobs suboptimal. For encoders I'd prefer knobs that measure less in diameter than the Waldorf ones.
    Actually I agree with you. I wish it was easy to get hold of the good old Re'an P401 (the Sammich knob). I think that production is ongoing for their 16mm and 16mn soft-touch knobs, as well as the hard tri-color knobs. Rapid Electronics carry those at reasonable prices. All those knobs at Rapid are for T18 shafts, BTW.

  23. A silly question about knobs

    in Parts Questions

    Posted · Edited by jojjelito

    Most likely the encoders come with a 6mm D-shaft. The flat is 4.5mm so this is the standard shaft, unless you go for a splined, a.k.a T18 serrated shaft. There are also 4mm and 6mm plain shafts, and 1/4" (6.35mm). Anywho, enough with the shaft sizes, it is a 6mm D-shaft if you got the recommended part.

    The nut that you normally want covered is either a M7 or M9 so you want a knob with a base diameter 12-13mm minimum. Of course, you should go for the aesthetically correct choice and join the Albs "Waldorf" knob bulk order that was just announced :)

    It is not easy to find "plain Jane" knobs without an indicator line for encoders.

    • Like 1
×
×
  • Create New...