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Wilba

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Wilba last won the day on October 22 2020

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About Wilba

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    MIDIbox Hero
  • Birthday May 6

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    http://www.midibox.org/dokuwiki/doku.php?id=wilba

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    Melbourne, Australia

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  1. jjj

    Hi Wilba,

    Joh here from T'ville Qld. 4814. - Regarding this: Cherry Jammer blog

    I would like to know where I can buy a PCB for these Cherry switches?

    I try to build a MIDI Janko accordion Kbd (for my Tyros3) and have already drilled 123 holes into a 1mm thick Alu sheet and glued these Cherry switched onto it (see Pic). - It' OK, but to make it really 100% I would need more precision; i.e. a printed PCB or machined matrix. 

    Greetings, Joh

    00.JPG

  2. That painted engraving is awesome! Even though I promoted the technique of painted engraving on Ponoko panels, I still can't get a great finish every time (which is why I got some Lexan overlays made for the current batch of sammichSID and will sell the spares to past builders very soon, sort of an apology for such a messy DIY process). Can you share how you defined the engraving as Ponoko-compatible? i.e. is this "three-stroke" vector like sammichSID, or raster only, or raster plus vector outline? And did you paint with backing paper still attached to the panel (like is done with sammi
  3. My MB-SEQ PCB is basically a combined switch/LED matrix for all the LEDs and switches (1x 74HC165 for inputs, 74HC595 for LED outputs, 74HC595 for matrix "column" sinks), plus dedicated 74HC165 for the encoders, since MIOS doesn't (didn't?) support encoders in a switch matrix, and even if they did, the routing would have been insane... it is actually a lot neater by having the 74HC165 close to the four encoders it is handling.
  4. Hi all, After receiving many emails about sammichSID since the "final batch" finished, I decided to do two more batches. One batch I am doing right now and trying hard to get in the post so they arrive before Christmas. There are still kits from this batch available. The 2nd batch will probably happen next year sometime after I get close to 50 more pre-orders. So if you read this message, just contact me via my email address (not PM) and I'll either a) have a kit to sell immediately or b) put you on a waiting list.
  5. T1L is definitely mounted wrong. That would explain left channel not working. There is no issue with European vs. American transistors... T1L and T1R are specified as BC547, and that's what I put in the kit. They should be mounted with the flat side matching the silkscreen. As for the other channel not working, it could be due to bad solder joints. For example, the pins of C3L,C3R,C4L,C4R. I also don't know what that pale looking stuff is on both sides of the board... is it flux residue? Did you attack it with a heat gun and burn the solder mask? FWIW nearly all issues people have with
  6. I've updated the wiki. Look here: and here: They are quite easy to fix with a cut resistor lead or wire between pins.
  7. I've fixed the broken forum links in the wiki.
  8. The LCDs I supply are high-current, they can take up to 250mA but look good at around 100mA (brightness pot at half-way). Since 100mA is a lot of extra current to go through the 5V regulator, the JBL header allows sourcing this current from the unregulated input power, i.e. around 12V. But for some reason, a lot of builders have trouble with this - either the BC337 burns out, or the backlight. I'm not exactly sure why, as I've not had this problem myself. I may have to change my recommendation, perhaps JBL should be set to 5V and let the 5V regulator run a bit hotter, and lessen the chanc
  9. The ICs being in backwards should not have caused T1 to blow. That usually happens if the current going through T1 is too high, due to the brightness pot being faulty, or if it's at max. and the backlight voltage (when it's set to JBL=12V) is too high (when using unregulated input power). I'd recommend testing the backlight pot as well as replacing T1. If you need more help (or replacement parts), just email me.
  10. I've been very busy lately and I have not replied to recent emails, sorry. Batch #23/#24 will be posted this week. Batch #25/#26 (potentially the absolute final batch ever) has 30 confirmed orders, and 20 empty places. It will be arranged soon. If you've emailed a pre-order recently, I'll reply ASAP. Sorry for the long delay.
  11. You may have continuity along all the pads connecting the switches with "blue dots" - this just means your soldering is good and the switches all work. The issue can still be a short between ANY pad along those tracks and something else. Perhaps you should desolder the wires going into JD1-JD5 and use a wire to touch pins on JD5 and pins on JD8 at the same time, to simulate switch presses. Observe which ones work or not while MB-SID is running. This might be tedious and boring but you must discover somehow whether the problems are on the CS PCB or on the base PCB. Or at least know fo
  12. Easy fix: I will send replacements. FWIW, I buy those exact LCDs from that supplier for the kits. They are good and cheap but about 1 in 50 don't pass my QA due to imperfections with the LCD substrate or whatever... they have some bright green spots around the active area. I test every LCD I sell, because it's less time and effort than trying to troubleshoot someone's sammich* which doesn't show a boot screen :wink:
  13. There is a wiring diagram in the wiki pages, scroll down to "Control Surface Wiring" and note the errors in my diagram (was too lazy to fix this at the time, sorry). Measuring voltages is probably hard to do because the switches are in a 8x8 matrix, so the voltage at the 75HC165 input is going to be either 5V for unpressed switches or ~1V for pressed switches, but only for 1 ms in every 8ms (guessing at the actual duration, could be 0.5ms every 4ms. It's 1/8 duty cycle though). Since I have the PCB layout and can highlight the connected tracks, I can see that some of the the non-working
  14. Sorry, by "pullup resistors" I meant R2 and R12, which are on the two signal lines between the PIC and the 24LC512 ICs (IC5-IC19) Regarding LCD: check the trimpots... I've had some go intermittent due to pressure, i.e. push them in too much with a screwdriver and it loses contact. So perhaps try pressing them to see if that's the cause. Regarding hum: nearly all the time, hum is caused by the input power. Perhaps it's not enough power and the voltage regulator can't produce stable 5V... or the power supply is switchmode and noisy. Also you might get hum if you're feeding the output into
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