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Injecting a voltage onto the feedback node of a regulator
I am having trouble understanding how to calculate the output voltage of a regulator when a voltage is injected into the feedback node. (See pic below) This technique is an easy...
Sat. Jul 14, 2007 - 08:10 PM
Op amp + digital potentiometer = PGA?
Has anyone ever used a digital potentiometer to change the gain on an op amp? My thought is this (crude?) tactic would add noise to the signal. For some applications it may be...
Tue. Jul 10, 2007 - 04:03 AM
Asynch timer2 vs timer1 for RTC applications
For applications which require a real time clock on smaller AVRs (such as M168), there are two techniques for generating a 1Hz interrupt that I know of: external 32.768khz crystal...
Tue. Oct 31, 2006 - 12:18 AM
My Dragon has been slain
Got a Dragon in a few days ago. Right out of the box, it appears to be faulty. I'm running the latest version of Studio with SP4, latest Dragon firmware. I can program M168s just...
Wed. Sep 27, 2006 - 11:01 PM
LCD printing difficulties - const char
Hi freaks... So I am using Martin Thomas's LCD library for SED1520 based displays. Text is put on the display with the following function: void lcd_text(uint8_t left, uint8_t...
Sat. Jan 28, 2006 - 12:56 AM
OT: high power bipolar stepper drive
Hi guys.. sorry for another off topic post. Current project includes driving two nema23 bipolar stepper motors of 2.8 amps per phase. This application requires very smooth, quiet...
Sat. Sep 24, 2005 - 11:25 PM
More efficient alternative to this code snippet?
Hi guys. I'm looking for a way to have a variable delay within a while loop that takes up a small amount of code. The example below compiles to 760 bytes of flash. If the delay is...
Mon. Sep 5, 2005 - 10:36 PM
5V boost circuit: 1AA or 2AAA? 12V boost possible?
The application is a tiny robot which will hopefully draw in the neighborhood of 50mA undle normal conditions and maybe 100mA in a worst case scenario. 5V boost chip: MAX856 ......
Sun. May 29, 2005 - 07:45 PM
Let's talk about motion control with an AVR
Something I have been pondering and tinkering with over the months is precision motion control. I understand PID, trapezoidal velocity profiles, quadrature decoding etc, and I'm...
Sat. May 7, 2005 - 03:05 AM
way off topic: 35 watt RF modems - possible ebay score
Freaks - I've found what could be a great deal on ebay: someone selling about 50 Motorola RF modems for $20 each. You can see the details (or lack thereof) if you follow this link...
Sun. Dec 12, 2004 - 02:40 AM
Butterfly refuses to take new code
I searched but I couldn't find anyone with a problem like this. This is such a dumb problem I'm almost embarrased to ask :oops: I'm using GCC 3.3.2, AVRDUDE 4.3.0, and a...
Mon. Aug 2, 2004 - 04:21 PM
Fastest programmer?
Hey all, newbie to the forums here. I'm a student used to working with PICs and I've got a big product I'm working on which I've decided requires the power and speed of the AVR...
Sun. May 23, 2004 - 01:13 AM