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Ever done a RTCA DO178B program?
In the sim biz there isn't any concept of flight safety. No flight in a sim. But we got a rfq to quote an actual flight qualified instrument. They asked if it has any software in...
Thursday, 20 August 2015 - 03:02
Use SSR on primary to control tranformer output?
Lets say I have an SSR that has zero crossing. Can I turn on for one 8ms half cycle, then turn off for 99 8ms halfcycles, and get 1% of the transformer voltage out of the...
Friday, 31 July 2015 - 01:32
TI TLC59282 spi led driver noise on led outs?
We made 100+ boards with these led drivers on them, and they seemed to work just fine until we had a problem with our membrane keyboard that used that fragile silver conductive...
Sunday, 26 July 2015 - 03:54
Beginner LTspice questions?
I am trying to use LTspice to pick the L and C for a 180V to 36V buck/stepdown (1/5th duty cycle). I have a voltage component with pulse checked. I can set on time for 10usec and...
Saturday, 18 July 2015 - 14:33
What does SAM mean?
Everyone wondered what AVR meant, so it seems fitting to figure out what SAM means. I'll guess: Smart Acornreducedinstructionssetccomputermachine Microcontroller. Votes? Rebuttals...
Sunday, 5 July 2015 - 14:49
First message in first forum
I hope these new arm forums really get the knowledge out about which models have which features. I'm always in ketchup mode try to maintain my place approximately 10 years behind...
Sunday, 5 July 2015 - 14:46
Inversion of Laws Of Physics?
I bragged that I could build an inductive height sensor. "Just a coil of wire with a magnetic core that slides in and out". So I get a plastic cylinder about 2" diam and 5" long,...
Friday, 26 June 2015 - 12:48
Step down switcher max in and out current?
Lets say I have a switcher input running direct from the 120V AC line half wave rectified thru a diode. 180V or so on the cap after the diode. I know I can pull 20 amps from the...
Tuesday, 23 June 2015 - 03:01
Normal temp for mega644?
I've got a mega644 on a board thats drawing 120ma and the chip is 118 deg F. Normal? Unusually hot? Is there a rule of thumb like "20 deg above ambient with normal load" or...
Tuesday, 9 June 2015 - 17:26
Can we switch spi doublespeed on and off while enabled?
I have yet another app with one of those little adafruit 128x32 oleds, and I'm running the spi at 0x50 and doublespeed on. This is 9.2MHz on my 18.432MHz 644. I am reading a...
Thursday, 4 June 2015 - 18:41
128x128 rgb oled anim video
https://youtu.be/bT6J8ov2Hb4 I added a still photo. Color is better  
Thursday, 4 June 2015 - 12:40
Animation techniques with no frame buffer?
I have one of the adafruit 128x128 rgb oleds, spi interface. About $40. The arduino sketch ran just fine, and I have converted my SSD1306 graphics routines that use a 512 byte ram...
Sunday, 10 May 2015 - 02:02

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