wight
October 28, 2014, 12:22am
157
Cereal_killer:
New version of the 17dd_v3.1 released . A quick overview of the changes-
A real GND plane (on both sides) this means no more pulling off the thin gnd rings, it also means you can scrape a little mask and have a GND point almost anywhere on the board.
GND plane has “thermal’s” on the lower power components (for easier soldering) but is solid for the FET’s source leg and the batt nagative input via to supply the necessary higher current (this was not easy to make)
A dedicated zener pad, no more stacking (simply leave unpopulated for 4.2v builds)
C1 is in the proper position to eliminate “boost circuit” issue so no more gate resistors
“Star’s” are easier to short with just solder
Dedicated batt- input via (used for piggybacking) Has a set of 1.1mm LED lead via’s (sized for 20AWG wire, even 18 will fit), this makes multi-emitter builds less of a pain.
Dedicated SW+ input via on pin3 for MOM FW’s
Batt+ spring pad is 8mm but only 5mm exposed (the size of standard 105C springs and those brass buttons), scrape to expose the full 8mm
Note this is not a mod of the V2, this was a total redesignhttps://644db4de3505c40a0444-327723bce298e3ff5813fb42baeefbaa.ssl.cf1.rackcdn.com/uploads/project/top_image/eD4kRUiO/i.png https://644db4de3505c40a0444-327723bce298e3ff5813fb42baeefbaa.ssl.cf1.rackcdn.com/uploads/project/bottom_image/eD4kRUiO/i.png
Hey Cereal_killer, I just had a chance to check my 22mm 7135 driver and I noticed that both your boards and mine use 1.1mm vias. According to me (post #38) I was unable to get 20AWG to fit through my 1.1mm vias, much less 18AWG. What gives? Do I just suck or do you have a secret technique?
