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[Solved] Suggestions for troubleshooting ethernet chip (ENC28J60)
I've got a circuit board with the ENC28J60 and a mega644 talking to each other through a buffer chip due to the voltage differential (5V mega -> 3.3V ethernet).   The...
Wed. Feb 11, 2015 - 09:09 PM
Organizing components
So I've got lots of 0805 components stored in tape form. I'd like to store each type of component in a tube that I can slap a label on. Sort of like a plastic test tube with a...
Thu. Aug 21, 2014 - 10:46 PM
White residue after cleaning PCB
Anyone else see this? It happens when I use either acetone or isopropyl alcohol. With either chemical, I dip a toothbrush in it and rub the PCB until the brown flux disappears...
Thu. Apr 24, 2014 - 09:48 PM
Do I need to care about this "power good output" p
Looking at this part: http://www.ti.com/lit/ds/symlink/lm25011.pdf I understand it I think except for the power good output pin. I'm just using this to convert 24VDC to 5VDC for...
Thu. Mar 6, 2014 - 04:56 AM
Caps and Inductors next to power supply pins of AVR
I'm reading the best practices and harsh environment application notes with the AVR and it's clear I need to add an inductor and capacitor right next to the supply pins of the AVR...
Wed. Dec 18, 2013 - 08:04 PM
Arduino LCD Shield converted to avrgcc...
Anyone have the arduino lcd shield? I'm trying to configure Peter Fleury's library to control the lcd screen but nothing doing. The schematic is here: http://www.sainsmart.com/...
Tue. Dec 17, 2013 - 05:48 AM
Ferrite Snapon Question
I'm supplying 5V to my circuit board via a 16-gauge wire . I'd like to put a ferrite core/choke snap-on on the wire but I'm only seeing two types of solutions out there: 1. The...
Sat. Nov 30, 2013 - 12:18 AM
Adding an inductor keeps my AVR from turning on.
So I'm trying to protect a circuit board that is receiving 5V from a wire that passes by some noisy relays. If I pass the wire several times through a ferrite core and then into...
Sat. Nov 23, 2013 - 12:36 AM
EMI Problem?
I'm using this crystal to drive my mega644 : http://cfm.citizen.co.jp/english/product/pdf/HC-49_U-S.pdf I'm using the 14.7456 MHz version of it and I'm seeing my chip freeze every...
Sun. Nov 17, 2013 - 07:39 PM
Can someone help me decode this spec sheet?
I have this 5V to 3.3V regulator: http://ww1.microchip.com/downloads/en/DeviceDoc/22056b.pdf I'm trying to figure out what the minimum Vin is before its 3.3V output isn't...
Tue. Nov 12, 2013 - 06:43 PM
SPI slave responding to data request from master
I've done one-way communication on SPI quite a bit but now I'm at a point where I need the master to ask the slave for something and get a response. From what I can tell, the...
Fri. Sep 20, 2013 - 02:29 PM
Best practice for receiving 5VDC?
If I'm supplying 5V to a circuit board, what is generally considered a reasonable way to protect the components on the circuit board from possible power spikes and other problems...
Wed. Aug 28, 2013 - 08:23 PM

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