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Which AVR would fit my project ?
Hey everyone, I'm aiming to use a mega328p to drive an rgb led strip. I would like to have the following features: 1. Ability to drive a the 3 rgb channels at 7 or 8 bit pwm AFTER...
Monday, 5 August 2013 - 21:15
TL783 thermal resistance, junction to ambiet so low ?
Hello everyone, I came across this part and it seems that the thermal resistance from junction to ambient is only about 19 C/W for a TO-220 package. Almost every other TO-220 chip...
Thursday, 9 August 2012 - 20:19
How to get power from USB and/or Voltage regulator ?
Hey everyone, I'm trying to design a development board. I want it to be powered from USB or an external dc source which will be regulated on the board. I would like to join both...
Sunday, 8 July 2012 - 21:06
Is this a viable voltage translator ? 3.3v to 5v
I'm trying to make a discrete fast (kind of) voltage translator, from 3.3v to 5v (AVR, Vih=3v). I know I can usually connect them directly, but I'm assuming the 3.3v output drops...
Monday, 2 July 2012 - 13:53
PL2303, any decent documentation ? app notes ? anything ?
Hey everyone, I'm planing on connecting an AVR to usb using PL2303. Since the datasheet is seriously lacking in information I tried searching for application note but couldn't...
Friday, 29 June 2012 - 14:22
BJT high side driver design
Some time ago I had to design a circuit which will pull a node (Vref - see schematic) in the circuit to Vcc. I decided to use a pnp bjt for that and drive it with an npn. I wanted...
Thursday, 31 May 2012 - 16:59
Anyone has any experience with 18650 Li-Ion batteries ?
I have recently came across some "UltraFire" 18650 Li-ion 3000 mAh batteries. They are claimed to be 3000mAh and internally protected, on top of that they cost 1.9$ each on ebay....
Sunday, 22 April 2012 - 17:42
PWM + PoV display, how to determine the sufficient pwm freq?
Hey everyone, This may not be so electronics related as to physics related. Assuming I have a PoV display, which displays 8*X pixels. How can I determine the minimum pwm frequency...
Wednesday, 11 April 2012 - 17:21
A simple question: Why doesn't this get optimized to SBI/CLI
Hey everyone, I'm just wondering why doesn't this get optimized to SBI/CLI, I've got -o3 set. TIMSK |= (1 << OCIE1A); // Enable CTC1A interrupt 00000050 IN R24,...
Saturday, 3 March 2012 - 11:33
Is this viable for precison half wave rectifier ?
Hey everyone, I'm trying to rectify and amplify an AC signal. I came up with this schematic. I'll probably be using LM358. I noticed the datasheet (TI) specifies that I shouldn't...
Sunday, 22 January 2012 - 23:15
Cascading AS1109 led drivers with one current set resistor ?
Hello everyone, I'm wondering if it is possible to cascade a number of AS1109 (DATASHEET HERE) but use only one resistor to set the current on all the drivers. Quote:The AS1109...
Sunday, 22 January 2012 - 21:36
Using ISIS as a simulator ?
Hey everyone, I'm using ISIS for more advanced simulation than AS5 can provide. Usually when I used it I loaded the ELF file and I could step through the program and see the...
Friday, 13 January 2012 - 13:11

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