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Nuclear-Spud
Australia
8 Posts |
 Posted - 09/04/2012 : 07:20:54
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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. |
Nuclear-Spud |
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GMC-080 and a Puff of Smoke
