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JackAl Display and Voltage Spikes

jjpurdum Member Profile All Messages By This Member #607 All: Two JackAl owners have reported that a voltage spike destroyed their RA8875 display. Al has looked into this and found that there is a very narrow voltage window on the display. Buydisplay confirms that 4V on the 3.3V line can ruin the display. From what we can determine, voltage spikes were the culprit in both cases.? What we're doing is creating a very small PCB that will clamp the supply voltage to the display. Parts for the board will cost less than $2. We will send one of these PCB boards to JackAl owners at no charge with a request and a SASE. We will provide further details when the boards come in and announce their availability here. We are also expanding the documentation and hope to have a new assembly manual by week's end. Again, we will announce it here. Jack, W8TEE Al, AC8GY ?
Mark Hatch All Messages By This Member #744 Jack, Was out of country for a few weeks and lost track of this. Is it still the plan to provide this board (the comment this morning about the dead 7" reminded me of this). Thanks for everything you guys are doing! Bet this has been more worked than you could have imagined. Just got my base uBITX working, so after doing the obvious mods I am excited about tackling this! 73 Mark AJ6CU
jjpurdum Member Profile All Messages By This Member #745 You're right. It has consumed about 10hr/day, 24-7, for the past 18 months. I've learned a lot, and even though I've spent thousands on it which I doubt that I'll ever recoup, it's been a great learning experience. Keep working on it...the end result is well worth it! Jack, W8TEE On Thursday, April 25, 2019, 7:30:49 AM PDT, Mark Hatch <mark2382@...> wrote: Jack, Was out of country for a few weeks and lost track of this. Is it still the plan to provide this board (the comment this morning about the dead 7" reminded me of this). Thanks for everything you guys are doing! Bet this has been more worked than you could have imagined. Just got my base uBITX working, so after doing the obvious mods I am excited about tackling this! 73 Mark AJ6CU
Eric Berman All Messages By This Member #746 Jack Would you have the PCB's available for pick up at FDIM??? Thanks Eric? KC3GDV toggle quoted message Show quoted text On Tue, Mar 26, 2019 at 3:38 PM jjpurdum via Groups.Io <jjpurdum=[email protected]> wrote: All: Two JackAl owners have reported that a voltage spike destroyed their RA8875 display. Al has looked into this and found that there is a very narrow voltage window on the display. Buydisplay confirms that 4V on the 3.3V line can ruin the display. From what we can determine, voltage spikes were the culprit in both cases.? What we're doing is creating a very small PCB that will clamp the supply voltage to the display. Parts for the board will cost less than $2. We will send one of these PCB boards to JackAl owners at no charge with a request and a SASE. We will provide further details when the boards come in and announce their availability here. We are also expanding the documentation and hope to have a new assembly manual by week's end. Again, we will announce it here. Jack, W8TEE Al, AC8GY ?
Fast hosts #747 ?Will the circuit definitely need a pc or could it be done on something like prototype board? I am in the Uk so might it be easier to construct it from a circuit diagram?? Keith M6 OLP toggle quoted message Show quoted text On Thu, 25 Apr 2019 at 16:42, Eric Berman <kc3gdv@...> wrote: Jack Would you have the PCB's available for pick up at FDIM??? Thanks Eric? KC3GDV On Tue, Mar 26, 2019 at 3:38 PM jjpurdum via Groups.Io <jjpurdum=[email protected]> wrote: All: Two JackAl owners have reported that a voltage spike destroyed their RA8875 display. Al has looked into this and found that there is a very narrow voltage window on the display. Buydisplay confirms that 4V on the 3.3V line can ruin the display. From what we can determine, voltage spikes were the culprit in both cases.? What we're doing is creating a very small PCB that will clamp the supply voltage to the display. Parts for the board will cost less than $2. We will send one of these PCB boards to JackAl owners at no charge with a request and a SASE. We will provide further details when the boards come in and announce their availability here. We are also expanding the documentation and hope to have a new assembly manual by week's end. Again, we will announce it here. Jack, W8TEE Al, AC8GY ?
Vince Loschiavo #748 It should be worth it once the bugs are down to a minimum.. there are alot of uBITX kits out there... I still have the 49er..pieces ready to get going as well..with the article in QST doing the same for this one (but not until there are more than a few successes should help with recouping your time invested..(which for me has been invaluable).. Vince N2AIE
jjpurdum Member Profile All Messages By This Member #751 Not sure what you mean by the second sentence. Jack, W8TEE On Thursday, April 25, 2019, 12:26:02 PM EDT, Vince Loschiavo <vince320@...> wrote: It should be worth it once the bugs are down to a minimum.. there are alot of uBITX kits out there... I still have the 49er..pieces ready to get going as well..with the article in QST doing the same for this one (but not until there are more than a few successes should help with recouping your time invested..(which for me has been invaluable).. Vince N2AIE
Mark Hatch All Messages By This Member #752 Jack, Are the boards available yet? Address on QRZ? 73 Mark AJ6CU
jjpurdum Member Profile All Messages By This Member #753 All: Al is waiting for parts to test the PCB's we had made. We expect the parts any time. We'll then build and test one using the PCB and will release the board and the Gerbers when we're sure it's right. Jack On Thursday, April 25, 2019, 2:47:54 PM EDT, Mark Hatch <mark2382@...> wrote: Jack, Are the boards available yet? Address on QRZ? 73 Mark AJ6CU

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