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Simplistic NJFET RIAA
Simplistic NJFET RIAA
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Old 4th April 2010, 12:31 PM   #3491
RCruz is offline RCruz  Switzerland
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Simplistic NJFET RIAA
The passive filter is very prone to noises due to parasitic capacitances.

When I use perfboard, i get the best results by removing the unused copper islands between the riaa filter components.

I also notice that the board must be totally free of flux in that area otherwise some noise appears.

PS: I read about submerging the built board in isopropil alcool would get rid of the flux completely but I did not try it because I am afraid the alcool might affect the components.

Last edited by RCruz; 4th April 2010 at 12:36 PM.
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Old 4th April 2010, 12:39 PM   #3492
massimo is offline massimo  Italy
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I use an old toothbrush to remove flux. Isopropil alcool is oK, but sometime not enough. C2HCl3 (trichloroethylene) or similar is more aggressive and components safe. It might remove printing on caps sometime.
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Old 4th April 2010, 12:45 PM   #3493
RCruz is offline RCruz  Switzerland
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I will search for C2HCl3 (trichloroethylene).

I use a stiff paint brush but sometimes the flux passes to the component side and sticks (particularly under the caps)... Can I submerge a board on C2HCl3 (trichloroethylene) or should I be afraid that it would soak some components ?
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Old 4th April 2010, 12:54 PM   #3494
massimo is offline massimo  Italy
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I think EU laws prohibits trichloroethylene, but some stain remover are also good. Ask your wife/mother
I only used old toothbrush to clean solder side, never submerged pcbs, thus no idea, but useless IMO.
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Old 4th April 2010, 02:49 PM   #3495
merlin el mago is offline merlin el mago
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Quote:
Originally Posted by merlin el mago View Post
Massimo, I am grateful for your advice (believe me I dislike use more cable than necessary & solder more than necessary), wich one of both will be the best star grounding.
Massimo, wich will be the best of two star ground?
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Old 4th April 2010, 03:15 PM   #3496
massimo is offline massimo  Italy
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1st option, I presume.
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Old 4th April 2010, 03:54 PM   #3497
merlin el mago is offline merlin el mago
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Grazie caro / Kind thanks
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Old 4th April 2010, 04:05 PM   #3498
merlin el mago is offline merlin el mago
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Ricardo, I use this with good success

Click the image to open in full size.
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Old 5th April 2010, 11:08 AM   #3499
RCruz is offline RCruz  Switzerland
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Thank you Merlin. I have seem that before but never tried it.... I will have a go now
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Old 5th April 2010, 11:56 AM   #3500
merlin el mago is offline merlin el mago
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Ricardo, I am sure that's distributed in Portugal too, because the instructions are wroted in Portuguese & Spanish (so Iberian product).
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