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radial electrolytic caps replace polystyrene caps?
Hi,   I am looking to replace the Vectrex game console motherboard's polystyrene caps, which are quite expensive.  I am wondering if normal radial electrolytic caps like...
Saturday, 21 May 2016 - 19:58
Mysterious voltage drop?
Hi,   I am trying to interface with the TMS9918ANL (TI's Video Display Processor, 30 years old!).  Min voltage requires for this chip is 4.75V.   I use the ATMEGA...
Tuesday, 29 March 2016 - 17:29
Can write fuses but CAN'T read back with usbtiny for ATMEGA328
Hi,   It's one of those fuse days again.  As you can see below, I can write the fuses for my ATMEGA328 (just the original ATMEGA328 not ATMEGA328P) using USBTiny...
Tuesday, 25 August 2015 - 00:32
Replacing electrolytic caps for the power supply board of a 30-year-old computer
Hi,   Besides playing with AVR microcontrollers, I collect vintage computers.  I have acquired an Atari 1040STF, and I believe the caps on the power board need to be...
Sunday, 5 July 2015 - 17:12
Generating a clock frequency
Hi,   I follow the attached schematic to generate a 3.579545Mhz frequency, using the crystal 3.579545Mhz.  In the schematic, I choose C1 as 22pF.  The frequency...
Saturday, 17 January 2015 - 22:54
Analog GND and digital GND clarification needed
Hi,   Doing a project with SPI and MP3 player using the VS1003B MP3 decoder chip.  I've found a lot of projects on the net that I can try out.  One such project is...
Friday, 2 January 2015 - 19:51
SPI MOSI -> MOSI?
Hi,   Pardon for this rather basic question.  But I just wanted to be sure.  When I use AVRDude to program an ATMEGA via SPI using the USBAsp program, MOSI pin of...
Friday, 2 January 2015 - 08:35
Can tantalum capacitors be used instead of electrolytic ones?
Hi,   I am wondering if tantalum capacitors can be used instead electrolytic capacitors for the Vin and Vout of a power source?  My power source is basically the USB...
Monday, 29 December 2014 - 02:29
Clock duty cycle
Hi all,   I am looking to make something fun with the MC6847, an old video display processor from Motorola.  I browsed through its datasheet (http://people.ece.cornell....
Monday, 22 December 2014 - 19:38
WinAVR reports a problem from the Makefile that is generated by Atmel Studio 4.19
Hi,   I have the attached the generated makefile from Atmel Studio 4.19, but keep getting the below errors when I issue the make command from WinAVR, which I prefer to use....
Saturday, 20 December 2014 - 18:49
Pulsing common ANODE LEDs via PWM
Hi,   I've bought a bunch of RGB LEDs, and based on the attached diagram, it looks like the LEDs are common ANODE.  I am looking to use an ATMEGA328 just to try out if I...
Saturday, 29 November 2014 - 17:24
XTAL1 and XTAL2 questions
Hi, Up until now with AVR devices, if I want high F_CPU freq for my AVR device, I would attach a crystal to the XTAL1 and XTAL2 with a couple 22pF caps. I've seen CPUs/MPUs, like...
Friday, 5 September 2014 - 15:09

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