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Old 6th October 2003, 08:12 PM   #51
Electrons are yellow and more is better!
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Brian, I don't know if you believe or not but in case you don't, just etch a test pcb and test this. The thing is cooling, too fast. You what happens when the tin cools off too fast -> ugly and sometimes bad solder joints.

The last attemt looks just about what I suggested.

Just in case: Put in a capacitor after the output resistor. This for preventing EMI to slipping out. The frequency can be rather high 100 kHz or more. You have good possibilities to filter at the pcb with SMD parts. Maybe 100 (or more) pF NPO can be a good start.
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Old 6th October 2003, 09:46 PM   #52
BrianGT is offline BrianGT  United States
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Quote:
Originally posted by peranders
Brian, I don't know if you believe or not but in case you don't, just etch a test pcb and test this. The thing is cooling, too fast. You what happens when the tin cools off too fast -> ugly and sometimes bad solder joints.

The last attemt looks just about what I suggested.

Just in case: Put in a capacitor after the output resistor. This for preventing EMI to slipping out. The frequency can be rather high 100 kHz or more. You have good possibilities to filter at the pcb with SMD parts. Maybe 100 (or more) pF NPO can be a good start.
Would I really want to put a ceramic capacitor in there? Is that alright?

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Old 6th October 2003, 10:24 PM   #53
Electrons are yellow and more is better!
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Quote:
Originally posted by BrianGT
Would I really want to put a ceramic capacitor in there? Is that alright?
This capacitors should work from 100 kHz and GOOD to above 500 MHz in order to filter good. NP0 has rather good charactersistics. Values is 1 nF (uncommon) to 100 pF depending of demands. You should also think about the frequency properties from the DAC output and forward.

Not this capacitor is optional but have it mind. The I/V converter and the following stage is sensitive when it comes to component choices.
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Old 10th October 2003, 08:34 AM   #54
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Wink Re: Re:See also

Quote:
Originally posted by Elso Kwak


See also this paper by Hank Zumbahlen of Analog Devices:
http://www.analog.com/UploadedFiles/...52667AN394.pdf
Fig. 26 on page 11.
Hi,
Here is a picture of my low noise supply for phonostage or preamp.
Center row IC's from bottem to top: LT1021-5 reference, OP27 low-pass filter, OP07 +5V to -5V converter. BD139/BD140 on coolers. OP27's next to coolers. AD797 can also be used.

It's all from datasheets (REF02, OP176)
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Old 11th October 2003, 05:04 PM   #55
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whats all the black at the right.......
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Old 11th October 2003, 05:38 PM   #56
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Lightbulb Black Stuf

Quote:
Originally posted by tbla
whats all the black at the right.......
Hi Troels,
Phonostage: balanced head amp and phono with RIAA correction.
You want to see it?
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Old 4th February 2004, 05:53 PM   #57
Raj1 is offline Raj1  United Kingdom
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Hi,

If building this circuit (jung reg), can I use 0.25watt resistors or must the wattage rating be higher?

Thanks
Raja
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Old 22nd January 2007, 11:43 AM   #58
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How easily could the super reg layout be scaled up to hundreds of volts? 600 say.
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Old 22nd January 2007, 11:59 AM   #59
Electrons are yellow and more is better!
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In theory: No problems if you can find the right parts.

In real life: It requires some work....

One big problem may be protection issues and also possible amount of feedback.
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