User:Rob Kam/sandbox1/sandbox4

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... Synth ...

4U LW format boat

  • Banana jacks
  • 4U
  • panels per module
  • Serge grid layout
  • CGS size PCBs (6” x 2”)
  • Prototype on tinned plated through 0.1” perfboard with kynar wire

Mounting

threaded clip

http://www.hexinverter.net/ Dotnet 4U is in 1" increments, Hexinverter's 4U panels have 4 holes for M3 screws, spaced 7 mm from the sides and top/bottom edges. other synth systems that also are 1" based Ken's CLee's Reese's Dmitri's

Panels at least 2 mm (1⁄8") thick to avoid flexing.

Just trawling through subrack/panel/rail mfrs specs, it seems that the 4U 'standard' panel is 172.9mm high - for the same reason that eurorack panels are 128.5mm high, not 133.4mm.

So to create a standard that is rackable with all these rails I guess one would have to go with that:

  • Panels 172.9mm high (about 6.8 inches or rather 6.807087")
  • Mounting holes in n x 1/5" increments.
  • Mounting holes 3.2mm diameter, 3mm in from top and bottom of panel.

One issue might be those using vector rails in a DIY case, as there would be a 0.6957mm discrepancy in alignment in the mounting holes (centre of rails = 0.1455" = 3.6957mm), using 2.5mm mounting screws would sort that I guess with the extra wiggle room...

Any thoughts on the 172.9mm panel dims?

(Beyond the obvious issue that 10mm must be allowed behind the panel - top and bottom - for rail clearance. This leaves only 152.9mm for the PCB - 6.0197" - which strikes me as a bit tight for the 6" standard 4U/CGS/Serge PCB's...)

https://www.modwiggler.com/forum/viewtopic.php?f=17&t=97747&start=150 bottom of page about potential problems with component widths

Internal power

  • PCB connections, wire to board, or to pins or with crimps to pin headers
  • Molex KK 100 or bus bar and cable clamps
  • Power leads soldered on to PCB?
  • External power connections. GX12 5 pin?

or

+15, -15, AGND, +5 DGND = 5 leads from external PSU. Connect to centre of bus. Leads connected to bus. Molex KK 100 on the ends of leads, mate with PCB connectors. 

cable in / bus / leads / connectors
           X
           |--------[
           |
           |--------[
           |
           |--------[
           |
           |--------[
###########|
           |--------[
           |
           |--------[
           |
           |--------[
           |
           |--------[
           X

pcb connected to front panel by bracket or by front panel components?

Internal DC power supply

Loudest Warning aka CLee suggest a power bus with 0.100" (2.54mm) 4 pin through hole connector keyed headers (Digi-Key part WM4202-ND, Molex 22232041). The leads, soldered to the PCB connect to the bus via 4 pin 0.100" (2.54mm) connector housing (Digi-Key part WM2002-ND, Molex 0022013047) and crimped pins (Digi-Key part WM2756-ND, Molex 8650805).[1]

Notes

  • PCB dimensions are 6" x 2" (152.40 mm x 50.8 mm) with 3 mm mounting holes 0.15" (3.81 mm) in from the edges.
  • 330R refers to 330 ohms. 100n = 0.1 uF, etc.
  • The module will work on +/-12 volts or +/-15 volts.

See also

References

  1. ^ BOM 4U LW Format Boat

External links

Electronic component suppliers

  • Bitsbox – "Small selection but very cheap.[1]" Delivery for £1.75 regardless of order size.
  • CPC – is actually owned by Farnell, but are sometimes cheaper than Farnell for the same items. Free delivery on orders over £5. Consumer-oriented.
  • ESR – general supplier of components. Half the price of farnell for some parts.
  • Farnell – has almost everything. Trade-oriented. Owns CPC and Newark. CPC are sometimes cheaper than Farnell for the same items. Free shipping if above minimum order.
  • Hobby Tronics – general supplier of components and Sparkfun stuff. Delivery costs £2.40 for orders under £50.
  • Mallinson Electrical – aims to offer good quality and low prices for small quantities.
  • Rapid – usually cheaper than RS or Farnell for run-of-the-mill parts. Website awkward to navigate. Sister company to RS with a smaller range but sometimes cheaper. Free delivery on orders over £30. * Spiratronics – "Small selection but relatively cheap.[1]"
  • Tayda Electronics – Thailand based, hobbyist supplier. Orders must be over $5. Low cost and reasonable quality. Shipping is cheap and might take a week or two to arrive. Good customer service by email. Regularly discount codes posted on their Facebook page.
  • TME.eu – electronic components, very competitive value.
  1. ^ a b Component Distributors, EEVBlog wiki
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