Tuesday, October 28, 2025

1130MRAM smoking gun found

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SCOPE ON 3.3V AND GROUND, TRIGGERED BY THE ANOMALY I set the scope on the yellow trace and triggered on the first fall of the +Storage Read ...
2 comments:
Saturday, October 25, 2025

1130MRAM spurious retrigger - what it can not be then musings

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NOT A FAULT OF THE CONTROL SIGNALS The control signals that fire off the timer chips are +Storage Read and +Storage Write . They are produc...
Wednesday, October 22, 2025

Output of Schmidt Trigger after a bit more massaging

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Here is the turn-on and turn-off points I am achieving against the 3V SLT signals such as +Storage Read. These are very satisfactory. As you...

Investigations for 1130 MRAM board - ways to block retriggering of the timer chip

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DESIGNING WIDE SCHMIDT TRIGGER CIRCUIT I see that the noise that shows up on the +Storage Read or +Storage Write line dips from 3V down to j...
Monday, October 20, 2025

Continued testing of 1130 MRAM board - results of probed points and added power wires

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TRACES OF KEY SIGNALS AFTER CHANGES TO BOARD No change with added power lines to the chips. A dead end I believe. FOUND SHORTED OUTPUT LEAD ...
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Continued testing of 1130 MRAM board - more probes added to zoom in on problem area causing retriggering

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ADDED EXTRA ENERGY PATHS TO VCC AND GROUND ON THE NAND CHIP I added wires to the VCC and ground pins of the 74HC00 chip to lessen resistance...
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Continued testing 1130MRAM board - retrigger problem continues to bedevil me

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STRONG FILTERING ON INPUT DID NOT STOP THE RETRIGGER I upped the RC network to a much longer time constant to see if that would block a shor...