Sunday, December 14, 2025

Same problem with 1130 MRAM in spite of new board

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SCOPE SHOWS SPURIOUS RETRIGGERING DURING READS The scope was set to trigger on the +STORAGE READ signal (yellow trace) activating. I display...
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Sunday, December 7, 2025

Beginning testing of new PCB for 1130 MRAM board

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NEW PCB READY FOR TESTING I had spent many hours checking continuity for all signals on the board and eliminating the chance of any shorts t...
Sunday, November 30, 2025

Replacing some chips on 1130MRAM board based on testing

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TOGGLING STORAGE READ AND OBSERVING THE SENSE OUTPUTS I have the board set up with a switch that will drive a rising edge on the +Storage Re...
Tuesday, November 25, 2025

Finishing new PCB for 1130 MRAM, waiting on memory chip

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CONNECTOR PINS INSTALLED AND MORE CHECKING ON THE PCB I use square profile gold plated pins, soldered onto the PCB with the correct spacing,...
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Sunday, November 23, 2025

Building new version of the PCB for 1130 MRAM

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USING SOLDER PASTE AND HOT AIR GUN FOR ALL SOLDERING Because so many of the chips are tiny footprints with very narrow pin spacing, I decide...
Tuesday, November 11, 2025

More work on retriggering issue with 1130MRAM

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GOOD SUGGESTION FROM A BLOG READER One of the blog readers, Merlin Skinner-Oakes, suggested that I add a low pass filter to the output signa...
Thursday, October 30, 2025

1130 MRAM - quick check after removing large buffer capacitors

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PREVIOUSLY ADDED CAPACITORS WHEN SUPPLY SAG SUSPECTED A while back I worried that the rails on the PCB were sagging during the heavy output ...
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