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Old 23rd February 2013, 05:47 PM   #1531
Salas is online now Salas  Greece
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Quote:
Originally Posted by Abraxas336 View Post
Salas - to be honest I don't know. Have it only for a couple of weeks. Will check.
Just gave it a try at X1 probes also and the only thing I could reliably capture from the circuit itself sans its dedicated regs was the 100Hz rectification residual breaking thru from the lab supply. Its the spikes in the graph.
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Old 23rd February 2013, 05:54 PM   #1532
pdul is offline pdul  Denmark
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Is it correct that the cutoff will be 1,59hz with 1uf, or am i completely of with my calc.?
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Old 23rd February 2013, 06:02 PM   #1533
RCruz is offline RCruz  Switzerland
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I wonder if one of you math professors can help me out with the value of a seriescap for the output of the paradise, if it will be loaded with 100ko, and which kind of cap that is best for the purpose?
I believe 0.5uF would do it as it would cut freq below 3Hz.

The best are teflon caps
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Old 23rd February 2013, 06:03 PM   #1534
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Originally Posted by pdul View Post
Is it correct that the cutoff will be 1,59hz with 1uf, or am i completely of with my calc.?
Correct
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Old 23rd February 2013, 06:03 PM   #1535
Salas is online now Salas  Greece
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Originally Posted by pdul View Post
Is it correct that the cutoff will be 1,59hz with 1uf, or am i completely of with my calc.?
Cut-off frequency
fc = 1.59154943092[Hz]
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Old 23rd February 2013, 06:58 PM   #1536
pdul is offline pdul  Denmark
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Thanks guys
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Old 23rd February 2013, 07:00 PM   #1537
FdW is online now FdW  Netherlands
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Quote:
Originally Posted by Abraxas336 View Post
Btw, the same ~90MHz are visibe on the input with a much lower amplitude of ~1mV
40mV near 100mHz almost a nice sinus, is a bit of an problem for the 100Mhz scope, and probably does not tell a lot about the original signal. I think that Salas is right, some strong signal induced by the environment. If (and only when) the RIAA has a proper box, you may be able to stop this signal by adding some ferrite beads in the input (and probably output and signal ground) wires.

If it is still a problem then (when boxed )

Last edited by FdW; 23rd February 2013 at 07:03 PM.
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Old 23rd February 2013, 07:08 PM   #1538
FdW is online now FdW  Netherlands
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Originally Posted by Salas View Post
Cut-off frequency
fc = 1.59154943092[Hz]
Are you sure about that '2' (at the end)?
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Old 23rd February 2013, 07:17 PM   #1539
Salas is online now Salas  Greece
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Are you sure about that '2' (at the end)?
Blame the RC calc. I declare myself "not guilty".
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Old 23rd February 2013, 08:39 PM   #1540
pdul is offline pdul  Denmark
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Are you sure about that '2' (at the end)?
It is very important to get that right, otherwise the bass will sound flat
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