SL1200 at 78rpm
- Dave Cawley
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#18
No guesswork is needed. It's a standard gate oscillator.
What was the specification of the crystal you used ?
Dave
What was the specification of the crystal you used ?
Dave
"if it measures well and sounds good, it is good : "if it measures badly and sounds bad it is bad" : "if it measures badly and sounds good, it could be improved" : "if it measures well but sounds bad it is bad"
- Dave Cawley
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#20
Give me a link to where you bought it from ?
"if it measures well and sounds good, it is good : "if it measures badly and sounds bad it is bad" : "if it measures badly and sounds good, it could be improved" : "if it measures well but sounds bad it is bad"
#21
Like an idiot I bought them cheap from eBay and looking back at it there were no other specs given.
I'd expect they're like these though, but I can't guarantee the specs unfortunately.
http://uk.farnell.com/jsp/search/produc ... id=2063993
I'd expect they're like these though, but I can't guarantee the specs unfortunately.
http://uk.farnell.com/jsp/search/produc ... id=2063993
- Dave Cawley
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#22
The Farnell one should be just fine.
Dave
Dave
"if it measures well and sounds good, it is good : "if it measures badly and sounds bad it is bad" : "if it measures badly and sounds good, it could be improved" : "if it measures well but sounds bad it is bad"
- Dave Cawley
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#25
I think that's because it is series and not parallel resonant ?
Dave
Dave
"if it measures well and sounds good, it is good : "if it measures badly and sounds bad it is bad" : "if it measures badly and sounds good, it could be improved" : "if it measures well but sounds bad it is bad"
- Dave Cawley
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#28
I'm not convinced. You often can't substitute crystals of different types. Maybe remove R222 ?
However it's a standard gate oscillator, what did you measure on the input and output ? DC and waveform ?
Regards
Dave
However it's a standard gate oscillator, what did you measure on the input and output ? DC and waveform ?
Regards
Dave
"if it measures well and sounds good, it is good : "if it measures badly and sounds bad it is bad" : "if it measures badly and sounds good, it could be improved" : "if it measures well but sounds bad it is bad"
#29
I checked the sheet again, definitely the right type. I didn't try removing R222 but I tried halving its value but no difference. I measured it at pin 4 of the AN6680 and there was no waveform just stuck high (correct waveform with the original crystal).
- Dave Cawley
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#30
The data sheet didn't specify parallel resonance. The output should not be hard high regardless. I would re-visit this ?
Dave
Dave
"if it measures well and sounds good, it is good : "if it measures badly and sounds bad it is bad" : "if it measures badly and sounds good, it could be improved" : "if it measures well but sounds bad it is bad"