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===QingPu Electronics===
Various parts look good. They supply to Digidesign and others:
*'''WQP-PJ3410-54''': http://www.qingpu-electronics.com/en/products/WQP-PJ3410-54.html (plastic bush)
*'''WQP-PJ3010BM-34''': WQingPuQingPu have a metal bush model with two ground lugs suitable for PCB mounting [http://www.qingpu-electronics.com/en/products/WQP-PJ3010BM-34.html QingPu Link]. PCB to panel gaps of 9.0 to 12.0mm look feasible, with the lower values achieved by bending the four feet diagonally or at 90 degrees. See here for a detailed analysis of these and some [http://www.firstpr.com.au/rwi/parts/3.5mm-sockets/ equivalents].
**Design issue resolved: In November 2012, QingPu started using beryllium-copper for the primary contacts, which overcomes a problem of deformation and NC contact failure which occurred with the previous production, which used phosphor-bronze.
**Sourcing: These or similar sockets are available in Q100Q50 lots, with knurled or hex nuts and washers, from USA online retailer http://erthenvar.com/store/eurodiy/jack35mmv where they were identified (2012-11-28), accordingalso tofrom theUK drawing,retailer asThonk J-301Bhttp://www. The QingPu page for Jthonk.co.uk/shop/pj301bm-301B does not mention beryllium copper, while the page for the PJ3010BM does.3-5mm-jack-sockets-x50/
*'''WQP-PJ301M-12''': A very nice alternative for Kobiconn 16PJ138, all PCB mount pins, also Be Copper tip, very reliable switch, worked very perfectly for Eurorack modules! http://www.qingpu-electronics.com/en/products/WQP-PJ301M-12-306.html
===Working with panel mount jack sockets===
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