Help with DIY Mains Conditioner / Filter

Dagwood · 6th August 2010, 06:16 PM

Hi all

I am attempting to assemble a mains filter from this web site

Building a mains conditioner.

Trouble is that I cannot find parts for Q1 and Q2 ,

Can anyone help and advise if this part is correct or even close

http://www.datasheetcatalog.org/data...x/FS40SM-6.pdf

Any help would be great

RJM1 · 07:26 AM

No, that part is not even close. Q1 and Q2 are in the signal monitoring section where the voltage delivered to Q1, 2 is limited by ZD1 to 12 volts. Q1 and Q2 are bipolar NPN transistors according to the diagram and are not NMOS transistors like your parts link. You need a low voltage small signal NPN transistor something like a 2N3904.

http://www.fairchildsemi.com/ds/2N%2F2N3904.pdf

RJM1 · 07:45 AM

parts placement.PNGYou can see from the parts placement diagram for your mains conditioner that Q1 and Q2 are a T0-92 package like the 2N3904.

Dagwood · 7th August 2010, 07:59 AM

Thanks RJM1

I was working solely from the part number??? Cleary wrong

It looks like a interesting project so very grateful for your expertise and the advice for a newbie!

What’s your thoughts on this project?

7th August 2010, 07:19 AM	#2
RJM1 diyAudio Member Join Date: Jan 2010 Location: Titusville, Fl.	No, that part is not even close. Q1 and Q2 are in the signal monitoring section where the voltage delivered to Q1, 2 is limited by ZD1 to 12 volts. Q1 and Q2 are bipolar NPN transistors according to the diagram and are not NMOS transistors like your parts link. You need a low voltage small signal NPN transistor something like a 2N3904. http://www.fairchildsemi.com/ds/2N%2F2N3904.pdf Last edited by RJM1; 7th August 2010 at 07:26 AM. Reason: added link

7th August 2010, 07:36 AM	#3
RJM1 diyAudio Member Join Date: Jan 2010 Location: Titusville, Fl.	parts placement.PNGYou can see from the parts placement diagram for your mains conditioner that Q1 and Q2 are a T0-92 package like the 2N3904. Last edited by RJM1; 7th August 2010 at 07:45 AM.

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7th August 2010, 07:59 AM	#4
Dagwood diyAudio Member Join Date: Feb 2010 Location: North of Auckland	Thanks RJM1 I was working solely from the part number??? Cleary wrong It looks like a interesting project so very grateful for your expertise and the advice for a newbie! What’s your thoughts on this project?

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