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Am I frying my crystals?


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I doubt you fried it, it could still be a power issue.....we all have seen odd behavior with crystals and power supplies.

To rule it out power it directly from batteries.

 

if that doesn't work, I will solder a 32khz crystal and send you(drive, boat down the Mississippi river) a working LP with it on there and you can figure out what you did lol

 

but my guess is power supply and I am sticking to it. Taking bets now!! lol

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I doubt you fried it, it could still be a power issue.....we all have seen odd behavior with crystals and power supplies.

To rule it out power it directly from batteries.

 

if that doesn't work, I will solder a 32khz crystal and send you(drive, boat down the Mississippi river) a working LP with it on there and you can figure out what you did lol

 

but my guess is power supply and I am sticking to it. Taking bets now!! lol

FYI - when I was having power problems (using an old USB charger) - touching or putting my hands near the crystal/pins changed the behavior. It only worked when I was touching the LP or had my hand near it, other times it would stop working when I came near - it wasn't consistent.

 

I was pretty sure it wasn't the three power sources I tried but, because you guys are WAY smarter than I am on this stuff, I tried again with a battery pack (3x fresh AA alkalines, measured at 4.4VDC w/o load) hooked to the test points near the USB port - same results.

 

I tested my bench supply (ATX power supply converted with Dangerous Prototypes board); I'm getting 5.15VDC with no load (measured with a good Fluke DMM). I've not hooked it to my (xProtolabs) o-scope, but it looked pretty stable on the DMM.

 

I have ordered some cylindrical crystals from ebay (~$2.50/10 shipped) similar in size to the watch crystals that come with the LP. I'll try again in a couple of weeks when they get here.

 

Should I try adding capacitors in the empty spots (couldn't hurt)? What value should I try?

 

I really appreciate everyone's input.

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don't add caps to the empty spot, use the built in cap settings. unless the value needed is not built in or you like soldering surface mount ;-)

 

values are usually chosen for a particular crystal.

 

I'll hold off then. Makes me wonder what I'll do for cap values when I get the ebay cheapos. :?

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