On Tue, Feb 15, 2011 at 7:56 AM, Tony Firshman <[email protected]> wrote:
> Bryan Horstmann wrote, on 15/Feb/11 13:42 | Feb15: > > On 15/02/2011 01:39, Plastic wrote: >> >>> On Tue, Feb 15, 2011 at 7:31 AM, Bob Spelten<[email protected]> wrote: >>> >>> On 14 Feb 2011, at 19:38, Plastic wrote: >>>> >>>> ... I would be happy to design and manufacture a limited run of these >>>> >>>>> adaptors to use CR2032s so we can all have our battery backed clocks >>>>> working again. >>>>> >>>>> Make sure the total height does not exceed the original. >>>> I had to shave of the legs of the holder to make it fit the QL without >>>> contacting the metal keyboard plate. >>>> >>>> There is 7mm of clearance from the top of the ICs below the battery to >>> the >>> top of the tallest component., Most holders are 7.5mm tall. I have >>> selected >>> a surface mount, low profile holder that, with the PCB thickness, will >>> not >>> be taller than the surrounding components - which leaves 1.2mm of >>> clearance. >>> >>> Hope this helps... >>> >>> Dave >>> >> It seems to me that only two pins connect the battery, the other pair >> being support; am I right? >> >> Yes. I have seen some builds of GC/SGC with a plus sign but I don't think > it is a=on all of them. Installation instructions will be needed. I will do a 1-off design verification board. Yes, only the top left pin was +3.0v, and the other three were 0v. On the GC only the bottom right pin was connected, but on other designs, other pins may have been used. So the PCB will have the +ve pin, then all the ground pins will be linked. This way, the board will also fit other designs that used the same battery. Later I will remove the ICs and continuity test to confirm the board is electrically the same as appearance, as it is a 4-layer board and there may be a hidden via. I will include full, IKEA-style instructions :) Dave _______________________________________________ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
