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Question about unknown SOT89 element.
It seems to be some sort of transistor, as though... The mark on the package is: SOT89 package +---+ +|8A |- || |- +|239|- +---+ If someone can identify it, I will be...
Tuesday, 20 July 2010 - 06:26
How bad is automotive environment?
Hi. I need some practical hints. Actually, how bad is automotive environment? For example, may I use direct connection of buttons/contact switches to the inputs of AVR chip, with...
Monday, 8 June 2009 - 07:31
Crazy design idea.
All we know, the RC clock oscillators are not stable enough for robust serial communication. The main frequency drift is caused by temperature and the voltage variations. While...
Friday, 5 December 2008 - 07:27
Place some code at the end of the memory.
Hi. I need to place some code at the end of the memory, regardless of the size of the code. I tryed following: .org FLASHEND - (CodeEnd-CodeBeg) + 1 CodeBeg: nop nop...
Tuesday, 2 December 2008 - 16:27
Question about input protection on AVR
Hi. On the applied picture is a fragment of the schematic that is aimed to measure the values of 8 resistive sensors (thermistors, potentiometers, etc.) in automotive environment...
Monday, 17 November 2008 - 09:48
Low reference voltage for ATMega ADC - is it possible?
I am trying to design a circuit to monitor the current in the ground wires of some loads. It is good to keep the maximal voltage drop as low as possible (the currents are big and...
Monday, 27 October 2008 - 18:10
RS485 termination/biasing
Hi all. What do you think about this method of termination/biasing RS485 line? I know that this is not the standard way, but in my opinion, the line will be properly terminated....
Friday, 24 October 2008 - 19:58
EMI sensitivity of AVR.
Hi all. Recently I decided to design some distributed automotive control system based on AVR family (ATTiny as slave devices, ATMega as a main controler and RS485 as an interface...
Monday, 20 October 2008 - 09:52