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SIM900D PROBLEM
I am now deaf, and thus unable to help. Please refrain from yelling.
Wednesday, 21 July 2010 - 14:30
open source AVR [core for FPGA]
You'll soon learn (I hope) that ugly has nothing to do with what's important - information. It's kinda like people, if you look on the outside versus looking on the inside, y'know...
Thursday, 15 July 2010 - 10:26
Suggestions?: Oscilloscope
Kartman wrote: Most oscilloscopes are pretty robust unless you do something real stupid to them. The ones with glass tubes - don't drop them! Actually, I'd say "don't drop them...
Thursday, 15 July 2010 - 09:20
Sampling AVR ADC values over SPI
Well, schematics would be a help to solve the ADC issue, because I can't relaibly see your circuit as it is. There's a few issues to take care of when using the ADC, as you might...
Thursday, 15 July 2010 - 09:16
Communication Methods
Yes, I'd go with 485, using extra pairs for power, and having one central brain (bus master) that has to keep track of everyone and handing out transmit slots to child nodes. I...
Thursday, 15 July 2010 - 08:31
4-bit SDRAM
There's a slight supply problem of IC's at the moment, which might explain why no one has the chip you want in stock. Also, using only 4 of 8 data lines is an effective way to cut...
Thursday, 15 July 2010 - 08:21
M-Systems Disk On Chip Problems
Congratulations on getting it to work! Ain't it sweet? :) Actually, they have pretty good reasons for requiring those strict schemes - external interference. It is very possible...
Wednesday, 14 July 2010 - 14:17
Please critique hopefully my last board revision...
Looks like a well-engineered board to me - but I suppose it should be at rev.8 :) I'm curious about the triangular ground area next to the DC jack - it looks cool and all, but...
Wednesday, 14 July 2010 - 14:04
Transistor Help with AVR and rf remote
Just had another thought Re: 12V... I'm no RF guy, but a higher voltage swing should be good for output power. More output power to spend could be translated into worse (smaller)...
Monday, 12 July 2010 - 15:13
digital isolator burn out
Schematics, schematics, schematics. It is very hard to tell what's possibly wrong with a circuit by just being shown a corner of it. What voltages you're feeding the chip can...
Monday, 12 July 2010 - 15:10
Transistor Help with AVR and rf remote
Yes, you're trying to switch a high-side load from a low-side switch, which will give exactly your results. You'll need to use the NPN transistor to drive a PNP transistor that...
Monday, 12 July 2010 - 14:59
Single input h bridge circuit for motor control.
To expand on the above, what happens when you accidentally allow both the upper and the lower transistor to be on at the same time is a very nasty almost-short-circuit between...
Monday, 12 July 2010 - 13:14

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