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  • Jyetech AVR digital oscilloscope DIY KIT — Firmware upgrade odyssey | My 2µF
    programmer s lights go out due to over current Right now a standard 10pin plug will short 5V to GND Also a standard header would allow to use a simple jumper to reset the CPU by connecting pin5 reset to pin6 GND Right now pin6 is not connected This could be hacked of course but only before the LCD has been assembled Add a cutout on the back panel to allow access to the header Right now the back panel has to be removed to plug in the 4pin serial plug 90 headers would be an option but that doesn t look very clean Also things like that get bent and break off all to easily later Here s my latest post on the arduino seeedstudio forum with important news New information on the firmware update As of NOW jyetech provides these files on their website firmware bootloader eeprom data If you want to update the firmware and have access to a windows PC download the updater and update using the bootloader It also works using a virtualized windows XP e g using virtualbox and an FTDI cable or a moderndevice BUB tested or the equivalent from seeedstudio You will have to build an adapter cable to match the USB adapter pinout to the 4pin serial connector on the scope You have to add the serial connector yourself the parts are not included in the DIY KIT Please note that once you have updated and decide to downgrade the firmware the eeprom data won t match anymore and you may get odd behaviour If you are on LINUX MAC using a programmer and avrdude seems the only option right now unless someone finds a way to talk to the bootloader with avrdude directly The avrdude commands are describes a few posts earlier According to seeedstudio the front panel size mismatch is being addressed I ll further investigate if the problems I have with the new firmware might be caused by a bad unregulated power supply I m using right now Maybe some changes in the firmware use tighter timing settings and make it prone to noise on the supply lines later I ve been able to make it crash with the 070 firmware and a clean power supply I ve checked with my big scope that the ADC chip doesn t get any clock signal form the ATmega64 anymore when it is crashed That could explain why the screen shows nothing anymore or at least doesn t get any updates I ve also confirmed that the CPU is only rated up to 16MHz ATmega64 16AU but it is clocked with 20MHz in the scope Maybe this one doesn t tolerate 20MHz and gets upset To make sure it s not caused by bad solder joints I ve touched up all the pins of the ATmega and the ADC chip but that didn t improve things at all I will make one last attempt to fix it by replacing the CPU

    Original URL path: http://blog.spitzenpfeil.org/wordpress/2009/07/09/digital-storage-oscilloscopy-with-an-avr-jyetech-diy-kit/ (2016-02-10)
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  • Trying to fix the sound of my Sega Game Gear — part 2 | My 2µF
    47µF 50V caps in my big box The fixed board in all its beauty And the complete Game Gear Finally 2 videos one showing the sounds of columns on my scope the other one is the intro of Sonic the Hedgehog 2 To sum it all up it was fun and much easier than expected A manual for fixing other Game Gear problems is here This entry was posted in Electronics Fix me and tagged computer archaeology games good old days hardware sega Bookmark the permalink Trying to fix the sound of my Sega Game Gear part 1 Simulating a quadrature decoder with LTSpice and what has become of it 3 Responses to Trying to fix the sound of my Sega Game Gear part 2 Jan says March 7 2009 at 07 44 Sega Game Gear FTW Reminds me that i still have one at my parents place It even has the TV cartridge Reply michel says March 19 2009 at 15 04 Hallo ik heb een vraagje ik heb ook meerdere sega gamegear s 2 met geluid en 1 zonder 1 van de twee met geluid daar is het beeld er donker van als je hem op de kachel legt een half uurtje dan is het beeld een stuk lichter valt dit te reparen er zit volgens mij een klein tl lampje in en wat vraag je voor reparatie geluid en als het kan het beeld weer moei helder gr Michel Reply robert says March 19 2009 at 16 09 Well if the sound problem you have is the same it can be fixed with 2 47µF capacitors for a few cents The back light issue may be caused by bad capacitors as well as shown in the link I posted at the bottom of this post So maybe it can be fixed by switching all those capacitors I haven t done that with my Game Gear so I have no experience with the outcome Oh and posting in English would be nice I had to use google translator Reply Leave a Reply Cancel reply Your email address will not be published Required fields are marked Comment Notify me of followup comments via e mail Name Email Website Leave this field empty CAPTCHA Code Search for Recent Comments robert on YauDL Y et a nother u seless D ummy L oad Andrew Duckworth on YauDL Y et a nother u seless D ummy L oad robert on YOUYUE 858D hotair station BLDC Fan speed mod Serhii on YOUYUE 858D hotair station BLDC Fan speed mod Serhii on YOUYUE 858D hotair station BLDC Fan speed mod Archives Archives Select Month January 2016 1 December 2015 2 November 2015 3 October 2015 2 September 2015 10 July 2015 4 June 2015 5 May 2015 2 April 2015 5 March 2015 3 February 2015 2 January 2015 1 December 2014 2 November 2014 2 October 2014 3 September 2014 1 August 2014 2 July 2014 2 June 2014 2 May 2014 2

    Original URL path: http://blog.spitzenpfeil.org/wordpress/2009/02/06/trying-to-fix-the-sound-of-my-sega-gamegear-%e2%80%94-part-2/ (2016-02-10)
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  • computer archaeology | My 2µF
    There s a little chip next to the earphone plug I haven t checked yet but I suspect it s some kind of amplifier So I ll warm up Continue reading Posted in Electronics Fix me Tagged computer archaeology games good old days hardware sega Leave a comment Computer archaeology Posted on October 30 2008 by robert Today while cleaning out documents I found a some old things and really prehistoric ones Posted in Electronics Tagged computer archaeology good old days hardware operating systems 1 Comment Search for Recent Comments robert on YauDL Y et a nother u seless D ummy L oad Andrew Duckworth on YauDL Y et a nother u seless D ummy L oad robert on YOUYUE 858D hotair station BLDC Fan speed mod Serhii on YOUYUE 858D hotair station BLDC Fan speed mod Serhii on YOUYUE 858D hotair station BLDC Fan speed mod Archives Archives Select Month January 2016 1 December 2015 2 November 2015 3 October 2015 2 September 2015 10 July 2015 4 June 2015 5 May 2015 2 April 2015 5 March 2015 3 February 2015 2 January 2015 1 December 2014 2 November 2014 2 October 2014 3 September 2014 1 August 2014 2 July 2014 2 June 2014 2 May 2014 2 April 2014 4 March 2014 3 February 2014 2 January 2014 1 December 2013 3 November 2013 6 October 2013 3 August 2013 3 July 2013 2 June 2013 6 May 2013 6 February 2013 2 January 2013 5 December 2012 1 August 2012 2 July 2012 7 June 2012 6 May 2012 5 April 2012 6 March 2012 2 February 2012 1 January 2012 3 December 2011 5 October 2011 2 September 2011 1 August 2011 1 July 2011 3 June 2011 1 March 2011 2 February 2011

    Original URL path: http://blog.spitzenpfeil.org/wordpress/tag/computer-archaeology/ (2016-02-10)
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  • games | My 2µF
    by robert Last time I turned it on I didn t get the usual boot up sound of Seeeeegaaaaa There s a little chip next to the earphone plug I haven t checked yet but I suspect it s some kind of amplifier So I ll warm up Continue reading Posted in Electronics Fix me Tagged computer archaeology games good old days hardware sega Leave a comment Search for Recent Comments robert on YauDL Y et a nother u seless D ummy L oad Andrew Duckworth on YauDL Y et a nother u seless D ummy L oad robert on YOUYUE 858D hotair station BLDC Fan speed mod Serhii on YOUYUE 858D hotair station BLDC Fan speed mod Serhii on YOUYUE 858D hotair station BLDC Fan speed mod Archives Archives Select Month January 2016 1 December 2015 2 November 2015 3 October 2015 2 September 2015 10 July 2015 4 June 2015 5 May 2015 2 April 2015 5 March 2015 3 February 2015 2 January 2015 1 December 2014 2 November 2014 2 October 2014 3 September 2014 1 August 2014 2 July 2014 2 June 2014 2 May 2014 2 April 2014 4 March 2014 3 February 2014 2 January 2014 1 December 2013 3 November 2013 6 October 2013 3 August 2013 3 July 2013 2 June 2013 6 May 2013 6 February 2013 2 January 2013 5 December 2012 1 August 2012 2 July 2012 7 June 2012 6 May 2012 5 April 2012 6 March 2012 2 February 2012 1 January 2012 3 December 2011 5 October 2011 2 September 2011 1 August 2011 1 July 2011 3 June 2011 1 March 2011 2 February 2011 5 January 2011 2 December 2010 3 November 2010 2 October 2010 1 September 2010 1 July 2010 2

    Original URL path: http://blog.spitzenpfeil.org/wordpress/tag/games/ (2016-02-10)
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  • good old days | My 2µF
    Seeeeegaaaaa There s a little chip next to the earphone plug I haven t checked yet but I suspect it s some kind of amplifier So I ll warm up Continue reading Posted in Electronics Fix me Tagged computer archaeology games good old days hardware sega Leave a comment Computer archaeology Posted on October 30 2008 by robert Today while cleaning out documents I found a some old things and really prehistoric ones Posted in Electronics Tagged computer archaeology good old days hardware operating systems 1 Comment Search for Recent Comments robert on YauDL Y et a nother u seless D ummy L oad Andrew Duckworth on YauDL Y et a nother u seless D ummy L oad robert on YOUYUE 858D hotair station BLDC Fan speed mod Serhii on YOUYUE 858D hotair station BLDC Fan speed mod Serhii on YOUYUE 858D hotair station BLDC Fan speed mod Archives Archives Select Month January 2016 1 December 2015 2 November 2015 3 October 2015 2 September 2015 10 July 2015 4 June 2015 5 May 2015 2 April 2015 5 March 2015 3 February 2015 2 January 2015 1 December 2014 2 November 2014 2 October 2014 3 September 2014 1 August 2014 2 July 2014 2 June 2014 2 May 2014 2 April 2014 4 March 2014 3 February 2014 2 January 2014 1 December 2013 3 November 2013 6 October 2013 3 August 2013 3 July 2013 2 June 2013 6 May 2013 6 February 2013 2 January 2013 5 December 2012 1 August 2012 2 July 2012 7 June 2012 6 May 2012 5 April 2012 6 March 2012 2 February 2012 1 January 2012 3 December 2011 5 October 2011 2 September 2011 1 August 2011 1 July 2011 3 June 2011 1 March 2011 2 February

    Original URL path: http://blog.spitzenpfeil.org/wordpress/tag/good-old-days/ (2016-02-10)
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  • Trying to fix the sound of my Sega Game Gear — part 1 | My 2µF
    sound amplifier board basically contains a potentiometer for volume control and the amplifier chip The 2 fat caps are for supply voltage decoupling The little SMD resistors and caps are hooked to the 2 outputs of the chips and seem to be a crude low pass filter just like in the datasheet The 2pin connector goes to the internal speaker What the inductor ish black thing is good for remains a miracle at the moment I haven t reverse engineered the schematic yet I just checked if the signals get to the chip Maybe some caps are gone These 2 SMD parts look a bit strange Maybe it is just flux maybe something boiled The AC part of the audio signals look like this Scope settings x 0 5ms div y 5mv div AC coupling effective 50mV 10 1 probe There is a significant DC offset on the signals Before I can go on I ll have to find out what the raw audio signal should look like in terms of voltage levels Maybe I ll set up an amplifier myself and try to pick up the audio from the main PCB and hear if that s anything resembling music I found a source for a detailed Game Gear repair for replacing a bad capacitor I ll need to check them Here s the test circuit for the chip It made it to the Game Gear almost without changes as far as I can tell so far People seem to have had problems with the caps at the output of the chip Others have had problems with caps on the main PCB giving bad video output I won t touch these This entry was posted in Electronics Fix me and tagged computer archaeology games good old days hardware sega Bookmark the permalink Creating 3D SVG graphs with google Sketchup7 on linux Trying to fix the sound of my Sega Game Gear part 2 Leave a Reply Cancel reply Your email address will not be published Required fields are marked Comment Notify me of followup comments via e mail Name Email Website Leave this field empty CAPTCHA Code Search for Recent Comments robert on YauDL Y et a nother u seless D ummy L oad Andrew Duckworth on YauDL Y et a nother u seless D ummy L oad robert on YOUYUE 858D hotair station BLDC Fan speed mod Serhii on YOUYUE 858D hotair station BLDC Fan speed mod Serhii on YOUYUE 858D hotair station BLDC Fan speed mod Archives Archives Select Month January 2016 1 December 2015 2 November 2015 3 October 2015 2 September 2015 10 July 2015 4 June 2015 5 May 2015 2 April 2015 5 March 2015 3 February 2015 2 January 2015 1 December 2014 2 November 2014 2 October 2014 3 September 2014 1 August 2014 2 July 2014 2 June 2014 2 May 2014 2 April 2014 4 March 2014 3 February 2014 2 January 2014 1 December 2013 3 November 2013 6

    Original URL path: http://blog.spitzenpfeil.org/wordpress/2009/02/03/trying-to-fix-the-sound-of-my-sega-game-gear/ (2016-02-10)
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  • Soldering DFN10 packages by hand — quite simple ! | My 2µF
    wider pads And the best of all it actually works This entry was posted in Soldering PCBs and tagged DFN10 footprint MLF10 SMD soldering Bookmark the permalink Prototype stencils from OSHStencils EEVBlog µRuler Crowdfunding gone Wild Just 5 hours left Leave a Reply Cancel reply Your email address will not be published Required fields are marked Comment Notify me of followup comments via e mail Name Email Website Leave this field empty CAPTCHA Code Search for Recent Comments robert on YauDL Y et a nother u seless D ummy L oad Andrew Duckworth on YauDL Y et a nother u seless D ummy L oad robert on YOUYUE 858D hotair station BLDC Fan speed mod Serhii on YOUYUE 858D hotair station BLDC Fan speed mod Serhii on YOUYUE 858D hotair station BLDC Fan speed mod Archives Archives Select Month January 2016 1 December 2015 2 November 2015 3 October 2015 2 September 2015 10 July 2015 4 June 2015 5 May 2015 2 April 2015 5 March 2015 3 February 2015 2 January 2015 1 December 2014 2 November 2014 2 October 2014 3 September 2014 1 August 2014 2 July 2014 2 June 2014 2 May 2014 2 April 2014 4 March 2014 3 February 2014 2 January 2014 1 December 2013 3 November 2013 6 October 2013 3 August 2013 3 July 2013 2 June 2013 6 May 2013 6 February 2013 2 January 2013 5 December 2012 1 August 2012 2 July 2012 7 June 2012 6 May 2012 5 April 2012 6 March 2012 2 February 2012 1 January 2012 3 December 2011 5 October 2011 2 September 2011 1 August 2011 1 July 2011 3 June 2011 1 March 2011 2 February 2011 5 January 2011 2 December 2010 3 November 2010 2 October 2010

    Original URL path: http://blog.spitzenpfeil.org/wordpress/2013/08/15/soldering-dfn10-packages-by-hand-quite-simple/ (2016-02-10)
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  • DFN10 | My 2µF
    Leave a comment Search for Recent Comments robert on YauDL Y et a nother u seless D ummy L oad Andrew Duckworth on YauDL Y et a nother u seless D ummy L oad robert on YOUYUE 858D hotair station BLDC Fan speed mod Serhii on YOUYUE 858D hotair station BLDC Fan speed mod Serhii on YOUYUE 858D hotair station BLDC Fan speed mod Archives Archives Select Month January 2016 1 December 2015 2 November 2015 3 October 2015 2 September 2015 10 July 2015 4 June 2015 5 May 2015 2 April 2015 5 March 2015 3 February 2015 2 January 2015 1 December 2014 2 November 2014 2 October 2014 3 September 2014 1 August 2014 2 July 2014 2 June 2014 2 May 2014 2 April 2014 4 March 2014 3 February 2014 2 January 2014 1 December 2013 3 November 2013 6 October 2013 3 August 2013 3 July 2013 2 June 2013 6 May 2013 6 February 2013 2 January 2013 5 December 2012 1 August 2012 2 July 2012 7 June 2012 6 May 2012 5 April 2012 6 March 2012 2 February 2012 1 January 2012 3 December 2011 5 October 2011 2 September 2011 1 August 2011 1 July 2011 3 June 2011 1 March 2011 2 February 2011 5 January 2011 2 December 2010 3 November 2010 2 October 2010 1 September 2010 1 July 2010 2 June 2010 2 May 2010 4 March 2010 2 February 2010 2 January 2010 2 December 2009 6 November 2009 1 October 2009 2 September 2009 1 August 2009 4 July 2009 8 June 2009 6 May 2009 3 April 2009 5 March 2009 2 February 2009 6 January 2009 2 December 2008 1 November 2008 2 October 2008 3 September 2008 7 Tags

    Original URL path: http://blog.spitzenpfeil.org/wordpress/tag/dfn10/ (2016-02-10)
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