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Discussion Title Created date
max current rating of USB connectors from PCs and laptops?
Hi, I googled and found most USB connectors' current ratings are from 1A to 1.5A. Can I safely assume that is also the current rating for PCs and laptops used? On the delivering...
Wednesday, 1 September 2010 - 03:27
Negative voltage for and LCD's contrast level. How?
Hi, I have this LCD, whose seller's spec is so scarce with info that I don't know how to generate a negative voltage for the LCD's contrast. The LCD is at http://www....
Sunday, 29 August 2010 - 04:41
How would I find/make a connector for such LCD (attached)
Hi, Attached is the LCD I am looking to use. I have a hard time of finding ways to interface with its connector for prototyping and breadboarding. Any tips how to do so? I...
Thursday, 26 August 2010 - 05:44
7-segment LEDs get hot even when multiplexed
Hi, I am using the dual 7-segment LEDs Schematic of the 7-segment is at http://www.es.co.th/Schemetic/PD... . It's a common anode with 15mA currnet to light each segment. I use...
Sunday, 4 July 2010 - 08:31
STK600 high-voltage programming on a "dead" ATTINY
Hi, I have a "dead" (meaning messed up fuse bits) ATTINY45. And I just inherited an STK600 kit. I read http://support.atmel.no/knowledg... and follow the links on serial/parallel...
Tuesday, 22 June 2010 - 05:53
74HC154 and LED matrix question
Hi, I am facing a problem that I can't seem to figure out. I will have a schematic drawn up, but here is my experiment. 1. TWO common cathode matrices. The matrix's spec is at...
Friday, 18 June 2010 - 08:12
ATMEGA8-16AU (TQFP 32-pin) package--2 extra ADC pins?
Hi, The ATMEGA8-16AU TQFP 32-pin package has two additional ADC pins, unlike the ATMEGA8 PDIP format, 28 pins. From the spec, the two extra ADC pins are pins 19 and 22. They are...
Monday, 14 June 2010 - 01:49
To drive the anode rows of a LED matrix, I need PNP or NPN?
Do I need PNP or NPN transistors? I use 8 pins from the ATMEGA8. Each pin will ultimately turn on and off each of the rows. Do I need PNP or NPN transistors? I know I will need...
Wednesday, 9 June 2010 - 05:30
0.1uF cap can be used for all VCC and GND pins?
Hello, I see that there are AVR microcontrollers, for example, AT90USB ones, have more than one VCC and GND pins. Standard practice is to put a 0.1uF cap (non-polarized) between...
Friday, 21 May 2010 - 05:05
Please take a look at my battery power schematic
Hi, it's a simple thing but I want to verify, so that I won't burn things in my electronics projects. Basically, I want to know that I connect the two batteries correctly in...
Wednesday, 12 May 2010 - 04:30
A good (prefer SOIC) PAL *and* NTSC encoder chip?
Hi, I have been looking and lows and highs for a good (in price as well) chip that can encode data into PAL and NTSC signals? (TI has a bunch of decoders but not encoder.) I...
Tuesday, 11 May 2010 - 21:57
ATTINY45 fuse woes
Hi, I have an ATTINY25 (2K flash) and programmed with the fuse bits LOW BYTE = 0x7F HIGH BYTE = 0xD7, basically with an external crystal > 8.0Mhz. I am using a 16Mhz crystal....
Friday, 23 April 2010 - 01:35

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