Friday, March 27, 2020

An attempt to improve the output of the DSKY power supply module, attempt 1

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Since the power supply was not delivering the target voltage even with boosted voltages for both the +13 and +24 inputs to the module, I dec...
3 comments:
Wednesday, March 11, 2020

Investigating recreation of DSKY power supply circuit

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Since NASA published the schematic and most of the component values for the power supply module that fits in the DSKY (Display/Keyboard) tha...
2 comments:
Tuesday, March 10, 2020

The EL panel has a variant color, different from later production DSKY panels

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The color of the panel is more blue with less yellow than we had expected. I dug through the NASA drawings that comprise the specification c...
Monday, March 9, 2020

Testing additional segments for operation after tweaking power supply

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POWER SUPPLY INVESTIGATION The voltage output was a bit too low. The panel expects over 250V at 800 Hz to drive to full brightness, but I ...

Improving connections and first testing of the EL panel

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CONNECTIONS MADE A BIT MORE SECURE I crimped the sides of the connectors together to tighten their grip on the DSKY pins, which gave me en...
Sunday, March 8, 2020

Results of DSKY power supply testing and power-up

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TEST SETUP The equipment I set up on the bench for the test of the power supply was: Signal generator set to produce 5V 800 Hz square w...
Tuesday, March 3, 2020

Complications during DSKY module testing and power up

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INCORRECT SCHEMATICS LED ME ASTRAY I had been working from a manual produced by AC Electronics, the prime contractor who managed Raytheon ...