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optocoupler feedback questions
  I'm trying to get a 5V 400 mA switcher working.  I don't get the expected output voltage and the reference circuits that drive the opto don't make sense to me.  ...
Sat. Mar 21, 2015 - 07:05 PM
small AC-DC switch-mode supplies: are they bread-boardable?
I'm trying to get all the kinks out of a small 250 mA 5V switch-mode supply that uses an LNK306.   It functions, but its hideously noisy.  I've got 0.3 V peak-to-peak of...
Tue. Feb 10, 2015 - 07:09 PM
cheap, non-isolated resistive current sensing of AC?
  I'd like to get approximate AC current up to 15 A load current in a non-isolated system using a cheap current sense resistor (ideally 5 mOhm or less but could use a bit...
Thu. Jan 22, 2015 - 10:15 PM
how to disconnect IO lines during boot?
I have hardware that says IO lines must not be driven until it says ok by raising a particular pin.   Anyone have any advice on good IC to put in to accomplish this?  ...
Wed. Oct 15, 2014 - 04:59 PM
is this battery monitor idea reasonable?
I'd like to use ATmega328P with an external voltage ref. for the ADC. But I don't want to ref. sucking juice all the time, so I want to drive it from an IO pin, then set the IO...
Thu. Jul 31, 2014 - 01:08 AM
where to get test points that you can grab with oscope probe
I've seen a number of prototypes that have those little loop thingies that you can put on your PCB so you can grab them easily with oscope clip later, but I'm not sure what they...
Fri. May 30, 2014 - 10:21 PM
Cheap power supply from 120VAC how?
Goal: Cheap power supply 0.2A @ 5V from 120VAC. Don't care about isolation. Prefer not to make too much waste heat in standby. I would love to use something like RECOM RAC01-05SC...
Thu. Feb 27, 2014 - 11:51 PM
PORTC pull-ups pull only part way up?
Conditions: 3.3V Vcc pull-ups enabled on PORTC pins 0 through 5, pull-ups enabled on PORTB pin 0 pull-ups enabled on PORTD pins 2 and 3 aforementioned pins...
Thu. Feb 20, 2014 - 03:37 AM
input line protection for long wires with ground loops?
I have switches at the end of long shielded twisted pair wires, one wire ground the other a higher voltage. I'm trying to figure out how to do the input protection (vs non-...
Wed. Apr 24, 2013 - 04:59 PM
lesson modules for cduino
Chris Kuethe contributed a really nice series of demos/lessons covering a variety of AVR subsystems: http://brittonkerin.com/cduino/l... I've added them as modules to cduino (http...
Mon. May 9, 2011 - 10:23 PM
Cduino project -- new project for C/make arduino programming
Hello AVR freaks, I've put together a project which aims to make it easy to program arduinos using straight C and make (and AVR libc, avrdude and avr-gcc). Right now it includes...
Tue. Apr 26, 2011 - 10:07 PM
program arduino with AVRISPmkII *without* nuking bootloader?
Hi guys, I can program the arduino using the bootloader. Or I can program it using AVRISPmkII, but that nukes the bootloader so I think have to replace it with another avrdude...
Fri. Apr 15, 2011 - 08:19 PM

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