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Post by Syntesis on Sept 16, 2011 17:45:30 GMT
I have a multimeter with a continuity buzzer and when I poke 2 clearly connected points it beeps and I get a reading of 001 to 010. Now where I've cut a trace I get no beep and readings in the 900s. Is it safe to conclude that the trace has been properly cut?
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rossi46
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Post by rossi46 on Sept 16, 2011 17:50:26 GMT
If there's no beep or buzz, you're quite safe.
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Post by Syntesis on Sept 16, 2011 18:58:09 GMT
Great, thanks  |
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mikey
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Post by mikey on Sept 16, 2011 22:48:22 GMT
Most digital multimeters today will auto-range in ohms (resistance), so measuring a short (straight wire) should be under 2 ohms, while an open (break in wire) SHOULD blank out the display... but that 900 reading you got was probably the multimeter switching to Mega-ohms range, where 900 meg is as good of an open as any.
If you have a tare or "zero" button on your multimeter, you should hold your leads together and tare it... which tells your multimeter what zero resistance is.
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mikey
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Post by mikey on Sept 16, 2011 22:56:04 GMT
Also, and sorry to double post, but removing a straight connection between two points doesn't necessarily isolate them from eachother, as there is other circuitry that may tie them back to eachother, often leading to a higher resistance (900 ohms?) as the current from the multimeter is impeded from whatever components are in the circuit.
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Post by Syntesis on Sept 16, 2011 23:51:27 GMT
Also, and sorry to double post, but removing a straight connection between two points doesn't necessarily isolate them from eachother, as there is other circuitry that may tie them back to eachother, often leading to a higher resistance (900 ohms?) as the current from the multimeter is impeded from whatever components are in the circuit. Yep that's what I'd figured while poking around. Thank you for confirming This is the mod I am doing: wolfsoft.de/wordpress/?p=980I won't be able to get a PIC programmer until next month but I wanted to at least cut the trace for 50/60hz. I thought it would hard mod it to 60hz in the meantime but it hasn't done anything so I was a bit confused. I guess it doesn't behave like the Mega Drive does. |
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mikey
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Post by mikey on Sept 17, 2011 3:25:20 GMT
That looks very cool!
I had to learn quite a bit about electronics maintenance and repair in the Air Force, but ended up sort of specialized with physical / mechanical equipment... So while I'm confident I could get into console modding and have tons of fun with it, I'd probably fry a few in the process.
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Post by Syntesis on Sept 17, 2011 17:03:55 GMT
I'm sure you'd get on fine, it's not nearly as intimidating as it looks. Retro consoles have so few moving parts and far fewer things to go wrong compared to the modern stuff. |
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metalhead
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Post by metalhead on Nov 15, 2011 19:02:44 GMT
Did you ever get this mod working BTW?
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Post by Syntesis on Nov 16, 2011 16:02:06 GMT
No, I still need to order the chip programmer so it's currently half finished. Right now I can't really justify the cost for a system I don't really play (I only have the built-in game).
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