Hi folks
I spotted these really cheap clock boards on ebay, they are intended for upgrading CD players.
As per usual, there isn't any info, other then it needs a 9-10v dc supply.
The IC is a 74C040, the voltage reg is an AMS1117 and the crystal is 16.9344Mhz.
I'm wondering if this thing would be a suitable upgrade to the clock in my DIY Dc, which has an AK4113 receiver board that has a clock crystal on it, the CS8421 SRC board also has a clock crystal on it, so I'm not sure how the clock is handled, whether the 8421 ignores the lock signal from the AK4113 and reclocks using it's own crystal or not.
Anyways, is this little ebay clock widget any use for improving DAC performance?
I spotted these really cheap clock boards on ebay, they are intended for upgrading CD players.
As per usual, there isn't any info, other then it needs a 9-10v dc supply.
The IC is a 74C040, the voltage reg is an AMS1117 and the crystal is 16.9344Mhz.
I'm wondering if this thing would be a suitable upgrade to the clock in my DIY Dc, which has an AK4113 receiver board that has a clock crystal on it, the CS8421 SRC board also has a clock crystal on it, so I'm not sure how the clock is handled, whether the 8421 ignores the lock signal from the AK4113 and reclocks using it's own crystal or not.
Anyways, is this little ebay clock widget any use for improving DAC performance?
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Doesn’t look much better than typically provided on kit boards.
No .01uf COG on the clock from what I can see in the picture, regulator doesn’t have quite enough of an output cap to keep it settled either.
Not that you couldn’t fix that...
That’s part of the power supply, can’t comment on the rest of it.
No .01uf COG on the clock from what I can see in the picture, regulator doesn’t have quite enough of an output cap to keep it settled either.
Not that you couldn’t fix that...
That’s part of the power supply, can’t comment on the rest of it.
It's sold for CD player upgrades. You can buy them without the TCXO so you can choose a different frequency.
The caps are a 100uF electrolytic and a 10uF electrolytic, the two white box caps are 100nF (0.1uF) and are most likely polyester.
AMS1117 regulator will probably be outputting 5v for the oscillator IC so why they say the board needs 9-10V is beyond me, the voltage drop of the reg is nowhere near 4v. The 1117 is hardly a top of the line regulator.
I'm thinking this board is a step up from the crappy clock in a CD player but no better than the usual clocks integrated into DIY DAC boards and probably can't be considered 'low jitter'.
It might have a use in DIY builds though.
The caps are a 100uF electrolytic and a 10uF electrolytic, the two white box caps are 100nF (0.1uF) and are most likely polyester.
AMS1117 regulator will probably be outputting 5v for the oscillator IC so why they say the board needs 9-10V is beyond me, the voltage drop of the reg is nowhere near 4v. The 1117 is hardly a top of the line regulator.
I'm thinking this board is a step up from the crappy clock in a CD player but no better than the usual clocks integrated into DIY DAC boards and probably can't be considered 'low jitter'.
It might have a use in DIY builds though.
I can’t tell how the circuit works, but It looks like the 100uf is before the regulator, and the 10 is after. The 1117 works pretty well with digital circuits if the application follows the data sheet, every one I have seen in use hasn’t so far!
Not a stellar low noise reg, but when they aren’t given the proper circuit or decent parts, is hard to say just how good or bad they really are.
It could be an ideal way to upgrade a CD player, that has far less to begin with, I agree.
Not a stellar low noise reg, but when they aren’t given the proper circuit or decent parts, is hard to say just how good or bad they really are.
It could be an ideal way to upgrade a CD player, that has far less to begin with, I agree.
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