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  • Floating voltages and bad GND connections — getting zapped and worse | My 2µF
    What annoys me most is that I m pretty sure these 200Vpp could have wrecked my AVR board I was messing with at the same time It was behaving very strange for some minutes after this incident and had to be reflashed several times The good thing coming from this little reminder of basic electronics is that I immediately checked the RCA plug for propers mechanical specs and boy it is truly a piece of shit The ID of the male plug should be 8 0mm the OD of the female plug should be 8 3mm Making good contact by expanding the 8 0mm to 8 3mm all fully reversible like a spring Fine This magnificent piece of hardware has an ID of 8 58mm Totally useless Suffice to say I immediately cut it off the probe wire and trashed it and the other one still waiting to be used DON T BUY CRAP SO YOU DON T GET ZAPPED This entry was posted in Electronics Fix me and tagged GND measurement Bookmark the permalink Jyetech AVR digital oscilloscope DIY KIT trying to fix it part 2 IKEA SAMTID modification part 2 5 Responses to Floating voltages and bad GND connections getting zapped and worse Helmut says August 13 2009 at 10 46 tja da hilft nur Hornhaut an den Fingern Reply Pingback Arduino based passive analogue input selection volume control Page 7 Head Fi Covering Headphones Earphones and Portable Audio Justin Kenny says November 1 2009 at 08 17 Similar experience happened to me although I was asking for it I tried measuring the output of a Geiger tube with the Jyetech oscilloscope on AC coupling mode and then got shocked twice I guess I was charging the AC coupling capacitor to the 235 volts or so at the Geiger tube s anode Amazingly the oscilloscope still works Reply robert says November 1 2009 at 08 50 Yup seems likely It s good that small capacitors don t store much energy Enough to make you fingers twitch though A friend of mine told me a story about touching a 400V capacitor He dismantled his SLR s external flash Apparently after charging it up fully It took him a while till he had full use of his right arm again Reply robert says March 24 2010 at 14 25 Here s a post with some more info regarding filtering using 2 class Y capacitors on the AC side http www arduino cc cgi bin yabb2 YaBB pl num 1269426724 0 http www eevblog com forum index php topic 168 0 http www ce mag com archive 06 ARG grasso htm It seems to be quite common to have 2 class Y caps on the AC side which also work as a 1 1 capacitive potential divider The middle point is connected to the pin on the DC side Therefore it floats at about 1 2 the AC side s voltage The capacitance mid to high pF range is chosen such

    Original URL path: http://blog.spitzenpfeil.org/wordpress/2009/08/12/floating-voltages-and-bad-gnd-connections-getting-zapped-and-worse/ (2016-02-10)
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  • GND | My 2µF
    power supplies measuring voltages and something called common ground Continue reading Posted in Electronics Fix me Tagged GND measurement 5 Comments 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

    Original URL path: http://blog.spitzenpfeil.org/wordpress/tag/gnd/ (2016-02-10)
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  • measurement | My 2µF
    worse Posted on August 12 2009 by robert Nothing good can come from a freak idea after mi Wait This time I actually learned something or in more pleasant words I was reminded that there was something about floating power supplies measuring voltages and something called common ground Continue reading Posted in Electronics Fix me Tagged GND measurement 5 Comments 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

    Original URL path: http://blog.spitzenpfeil.org/wordpress/tag/measurement/ (2016-02-10)
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  • Jyetech AVR digital oscilloscope DIY KIT — trying to fix it – part 2 | My 2µF
    input file 0xFF avrdude input file 0xFF contains 1 bytes avrdude reading on chip efuse data Reading 100 0 00s avrdude verifying avrdude 1 bytes of efuse verified avrdude safemode Fuses OK avrdude done Thank you 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 avrdude c usbtiny p m64 U lfuse w 0xAE m U hfuse w 0xC0 m U efuse w 0xFF m avrdude AVR device initialized and ready to accept instructions Reading 100 0 02s avrdude Device signature 0x1e9602 avrdude reading input file 0xAE avrdude writing lfuse 1 bytes Writing 100 0 01s avrdude 1 bytes of lfuse written avrdude verifying lfuse memory against 0xAE avrdude load data lfuse data from input file 0xAE avrdude input file 0xAE contains 1 bytes avrdude reading on chip lfuse data Reading 100 0 00s avrdude verifying avrdude 1 bytes of lfuse verified avrdude reading input file 0xC0 avrdude writing hfuse 1 bytes Writing 100 0 02s avrdude 1 bytes of hfuse written avrdude verifying hfuse memory against 0xC0 avrdude load data hfuse data from input file 0xC0 avrdude input file 0xC0 contains 1 bytes avrdude reading on chip hfuse data Reading 100 0 00s avrdude verifying avrdude 1 bytes of hfuse verified avrdude reading input file 0xFF avrdude writing efuse 1 bytes Writing 100 0 01s avrdude 1 bytes of efuse written avrdude verifying efuse memory against 0xFF avrdude load data efuse data from input file 0xFF avrdude input file 0xFF contains 1 bytes avrdude reading on chip efuse data Reading 100 0 00s avrdude verifying avrdude 1 bytes of efuse verified avrdude safemode Fuses OK avrdude done Thank you Writing the EEPROM data avrdude c usbtiny p m64 U eeprom w 113 06201 080 eep B 100 avrdude Setting SCK period to 100 usec avrdude AVR device initialized and ready to accept instructions Reading 100 0 06s avrdude Device signature 0x1e9602 avrdude reading input file 113 06201 080 eep avrdude input file 113 06201 080 eep auto detected as Intel Hex avrdude writing eeprom 1737 bytes Writing 100 69 71s avrdude 1737 bytes of eeprom written avrdude verifying eeprom memory against 113 06201 080 eep avrdude load data eeprom data from input file 113 06201 080 eep avrdude input file 113 06201 080 eep auto detected as Intel Hex avrdude input file 113 06201 080 eep contains 1737 bytes avrdude reading on chip eeprom data Reading 100 26 73s avrdude verifying avrdude 1737 bytes of eeprom verified avrdude safemode Fuses OK avrdude done Thank you 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 avrdude c usbtiny p m64 U eeprom w 113 06201 080 eep B 100 avrdude Setting SCK period to 100 usec avrdude AVR device initialized and ready to accept instructions Reading 100 0 06s avrdude Device signature 0x1e9602 avrdude reading input file 113 06201 080 eep avrdude input file 113 06201 080 eep auto detected as Intel Hex avrdude writing eeprom 1737 bytes Writing 100 69 71s avrdude 1737 bytes of eeprom written avrdude verifying eeprom memory against 113 06201 080 eep avrdude load data eeprom data from input file 113 06201 080 eep avrdude input file 113 06201 080 eep auto detected as Intel Hex avrdude input file 113 06201 080 eep contains 1737 bytes avrdude reading on chip eeprom data Reading 100 26 73s avrdude verifying avrdude 1737 bytes of eeprom verified avrdude safemode Fuses OK avrdude done Thank you Writing the bootloader avrdude c usbtiny p m64 U flash w 113 06202 020 hex avrdude AVR device initialized and ready to accept instructions Reading 100 0 01s avrdude Device signature 0x1e9602 avrdude NOTE FLASH memory has been specified an erase cycle will be performed To disable this feature specify the D option avrdude erasing chip avrdude reading input file 113 06202 020 hex avrdude input file 113 06202 020 hex auto detected as Intel Hex avrdude writing flash 65532 bytes Writing 100 207 97s avrdude 65532 bytes of flash written avrdude verifying flash memory against 113 06202 020 hex avrdude load data flash data from input file 113 06202 020 hex avrdude input file 113 06202 020 hex auto detected as Intel Hex avrdude input file 113 06202 020 hex contains 65532 bytes avrdude reading on chip flash data Reading 100 117 99s avrdude verifying avrdude 65532 bytes of flash verified avrdude safemode Fuses OK avrdude done Thank you 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 avrdude c usbtiny p m64 U flash w 113 06202 020 hex avrdude AVR device initialized and ready to accept instructions Reading 100 0 01s avrdude Device signature 0x1e9602 avrdude NOTE FLASH memory has been specified an erase cycle will be performed To disable this feature specify the D option avrdude erasing chip avrdude reading input file 113 06202 020 hex avrdude input file 113 06202 020 hex auto detected as Intel Hex avrdude writing flash 65532 bytes Writing 100 207 97s avrdude 65532 bytes of flash written avrdude verifying flash memory against 113 06202 020 hex avrdude load data flash data from input file 113 06202 020 hex avrdude input file 113 06202 020 hex auto detected as Intel Hex avrdude input file 113 06202 020 hex contains 65532 bytes avrdude reading on chip flash data Reading 100 117 99s avrdude verifying avrdude 65532 bytes of flash verified avrdude safemode Fuses OK avrdude done Thank you Writing the firmware avrdude c usbtiny p m64 D U flash w 113 06201 080 hex avrdude AVR

    Original URL path: http://blog.spitzenpfeil.org/wordpress/2009/08/09/jyetech-avr-digital-oscilloscope-diy-kit-trying-to-fix-it-part-2/ (2016-02-10)
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  • ChipQuik | My 2µF
    Seeedstudio SMD soldering 2 Comments Note to self 26 0V 2 60V A short ChipQuik review Posted on August 4 2009 by robert Nothing good can come from a freak idea after midnight Posted in Arduino Electronics Fix me Soldering PCBs Tagged ChipQuik desoldering rework SMD soldering 6 Comments 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

    Original URL path: http://blog.spitzenpfeil.org/wordpress/tag/chipquik/ (2016-02-10)
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  • jyetech | My 2µF
    chip doesn t get a CLK signal during a freeze My theory The Continue reading Posted in DIY Electronics Fix me Tagged AVR DSO jyetech Seeedstudio soldering 2 Comments Jyetech AVR digital oscilloscope DIY KIT Firmware upgrade odyssey Posted on July 9 2009 by robert I bought the DIY KIT at seeedstudio recently as I needed to feed my soldering obsession Here are some images of the KIT coming right out of the box I had to use my milling machine because the front panel Continue reading Posted in DIY Electronics Fix me Tagged AVR DSO jyetech Seeedstudio soldering 5 Comments 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

    Original URL path: http://blog.spitzenpfeil.org/wordpress/tag/jyetech/ (2016-02-10)
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  • Note to self: 26.0V >> 2.60V — A short ChipQuik review | My 2µF
    little of it to remove a chip Here s the procedure that worked for me Apply paste flux to the pins Cut off a small piece of alloy Melt and mix with old solder Repeat for all sides Simply remove the chip Thoroughly wick away residual solder Clean the board with isopropyl alcohol Once all sides are treated and heated sufficiently the chip will slide off the PCB easily There s enough time to put down the soldering iron and use a pair of tweezers to remove the chip One of the interesting properties of Bismuth is its low thermal conductivity It is just about 2 of copper 7 97 W m K vs 401 W m K In practice this means it stays warm and therefore liquid much much longer than ordinary solder You can poke it with a pair of metal tweezers and it stays liquid whereas ordinary solder would solidify instantly Here are some pictures of how I removed two SOIC 16 and one TQFP32 7 7 chip And a video I highly recommend this product This entry was posted in Arduino Electronics Fix me Soldering PCBs and tagged ChipQuik desoldering rework SMD soldering Bookmark the permalink 64 pixels photo group started on Flickr Jyetech AVR digital oscilloscope DIY KIT trying to fix it part 2 6 Responses to Note to self 26 0V 2 60V A short ChipQuik review Marcus says August 6 2009 at 10 07 I can only recommend you to get an hot air reworking station you can get them in germany for about 100 150 And the fun to just blow off the chips is unbeaten and much easier Reply robert says August 6 2009 at 13 37 I wasn t planning to kill that many chips you know Now that I ve bought the stuff I might as well use it Reply Gigahertz Inc says August 16 2009 at 19 32 You should use a breadboard like I do on http www nerdful com Reply Mathias says August 20 2009 at 13 12 Hi Robert thanks for your reply about the 74HCT595 on watterott net I m not 100 sure at the moment but this chip might deliver enough current for my project D Anyhow I think I ll order one of your 64 pixel kits next month This should be the right challenge for my while having my annual holidays Reply ello says May 3 2010 at 15 25 robert you don t kill anything using a hot air station if you are using it the right way I always use it to solder and desolder any kind of smd I never killed something with hot air Reply robert says May 3 2010 at 16 40 I didn t mean to say I d kill the chips with the hot air station I just think my demand for removing chips isn t high enough to justify the expenses for such a device Reply Leave a Reply Cancel reply Your email

    Original URL path: http://blog.spitzenpfeil.org/wordpress/2009/08/04/note-to-self-26-0v-2-60v-a-short-chipquik-review/ (2016-02-10)
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  • Jyetech AVR digital oscilloscope DIY KIT — trying to fix it – part 1 | My 2µF
    the cause of all evil here Update 1 23 07 2009 I ve received a free replacement DIY KIT from Jyetech today After assembling it it was at first acting a bit strange but that somehow resolved itself at least last time I checked This time I powered it with a regulated power supply at 9V DC The new one draws a current of 240mA 080 firmware the older KIT just 190mA 070 firmware The 5V voltage regulator just gets a bit warm Sometimes button presses seem to be ignored maybe I need to adjust the way I press them There is no hardware debouncing it seems to be done in software This time the front panel was cut to size properly and the LCD fit snugly without modifications I will do some stability tests later I guess I will compare my big power supply vs connecting it to my PC with a USB TTL adapter The test will basically consist of me trying to make the scope crash or freeze by continuously working with it switching timebase and modes First I will compare the new KIT with the latest 080 firmware against the old KIT with the 070 firmware Then I ll upgrade the old KIT to 080 and test it again That s all for now Any comments from jyetech scope users and further ideas for testing and hopefully fixing it are highly welcomed http groups google com group jye tech oscilloscopes This entry was posted in DIY Electronics Fix me and tagged AVR DSO jyetech Seeedstudio soldering Bookmark the permalink Jyetech AVR digital oscilloscope DIY KIT Firmware upgrade odyssey V3 04 PCBs from MakePCB have arrived 2 Responses to Jyetech AVR digital oscilloscope DIY KIT trying to fix it part 1 robert says July 17 2009 at 17 26 I got an email from Jyetech offering a FREE replacement DIY KIT That s what I call good customer care Let s see how that goes If I m lucky it will come with the latest firmware and I won t have to risk an update again As I ve already ordered some chipquik and a replacement ATmega64 cpu I ll still try to fix the scope I already have sitting in its box Maybe I ll end up with 2 working devices Reply robert says July 18 2009 at 21 04 Jyetech will ship the replacement DIY KIT for their scope on Monday It will come with the latest firmware so I won t have to risk the upgrade procedure again Before it start assembly of it I will concentrate on getting the current one fixed once I have time 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

    Original URL path: http://blog.spitzenpfeil.org/wordpress/2009/07/12/jyetech-avr-digital-oscilloscope-diy-kit-%e2%80%94-trying-to-fix-it/ (2016-02-10)
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