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Discussion Title Created date
Any pointers for bitbang ASK demodulation ?
Hey guys, I'm starting to work on bitbang ask demodulation and receiving. The signal is rather low amplitude so I'm forced to use the internal comparator. I've decided to use 4KHz...
Monday, 2 January 2012 - 16:50
Saturated op amp. Should I care ?
Hey everyone, I remember reading that it's not advised to get an op amp to saturate and that is may cause large current consumption or something like that. Is there any truth to...
Friday, 30 December 2011 - 23:29
Why use an external pull up on reset pin ?
Hey everyone, According to the datasheet it seems like the reset pin is internally pulled up. If so, why use an external pull up ? Why not leave it floating ?
Monday, 26 December 2011 - 19:56
How to generate a 38KHz 10% or 25% d.c with minimum cpu load
Hey everyone, I would like to generate a 38KHz (low duty cycle 25% or 10% or so) on an atmega8a with minimum cpu usage. The avr runs on an 8MHz internal oscillator. The highest "...
Wednesday, 21 December 2011 - 21:21
Which checksumming method should I use ?
Hello everyone, I have a simplex data line from the pc to an Atmega8a (8 MHz internal RC). The data is coded in Manchester code at about 4kbps. I would like to add the ability to...
Tuesday, 20 December 2011 - 17:37
Medium distance proximity sensor.
Hello everyone, I'm looking for a way to sense whether an object passes in front of a sensor. I need the sensor to be stand alone, I can't have it in a receiver in front of a...
Sunday, 18 December 2011 - 22:05
Current loops in a constant current driver ic ?
Hey everyone, I'm wondering if I'm understanding this correctly. I have this IC [datasheet] which is a constant current led driver which sinks current. Let's say I got one running...
Saturday, 17 December 2011 - 00:50
Sound card output signal biasing ?
Hey everyone, I'm looking to interface the stereo output of a PC sound card. From what I've read the output signal has an impedance of 100 ohm an amplitude of 2v peak to peak and...
Monday, 5 December 2011 - 17:56
AVR/Multipurpose debugger project ?
Hey everyone, I just thought of a useful project to play around with: an mcu debugger. The debugger will be a unit with rs232 port to connect to the pc and some probes to connect...
Saturday, 26 November 2011 - 22:23
Level shifter circuit + diode clamps ?
Hello everyone, I designed a simple 28-32v to 5v level shifter with a simple zener diode and an LED to indicate the status. [See attachment] I would like to interface it to an MCU...
Monday, 21 November 2011 - 17:06
About HD44780 CGRAM and Display RAM.
Hey everyone, Looking at the datasheet I see there are 64 bytes for Character generated RAM and for some reason it says that I can fit 8 characters (5x8 font). Anyways, can I...
Friday, 18 November 2011 - 21:04
Is this simple gate driver circuit viable ?
Hey everyone, I'm wondering if this gate driver I made is viable for driving a mosfet with a 22KHz(ish) pwm signal. What kind of improvements can I add here ?
Thursday, 17 November 2011 - 21:55

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