All Forums  GQ Electronics Forums  2.GQ Geiger Muller Counter  GMC-080 and a Puff of Smoke

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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by Nuclear-Spud[/i] [br]I recently bought two GMC-080 kits and have been playing around with then using the M4011 Tubes, ( I like a spare encase I break something) I connected the data port of the unit to the Mic input of an old Laptop I am using as an internet server, and was running it on battery with no problems. When the unit ran flat, I connected the 9v Switch mode supply, and not long after things stopped working, I opened the lid and smelt that magic burning smell with a little smoke. The laptop also runs off a 19v non earthed switch mode supply, I measured between the Mic earth and the 9V Supply earth, 80 Volts AC. R1 on the PCB is black. From the second unit this appears to be a 50R SM Resistor, I will replace this in the next couple of days and let you know if the GMC-080 recovers or if I have really broken it. Something to be careful of when using switch mode supplies without earthing reference. [/quote]    Insert an Image File Check here to include your profile signature.