ricothetroll
Well-known member
Hi,
I have a dual 1176LN working but without matched transistors for the moment. As I want to use it dual or stereo (I have Hairball's stereo link kit installed), I should use a matched quartett of fets. As I have an order to do at Musikding soon, I saw they have a matched quartett of 2N5952 fets, used as variable resistors in phaser circuits :
http://www.musikding.de/product_info.php/info/p759_2N5952---matched-quartett.html
I looked for the datasheet of both 2N5952 and BF245A to compare them and eventually find out whether they are similar enough or not.
Here are the only two datasheet I could find for the 2N5952 :
http://www.datasheetcatalog.com/datasheets_pdf/2/N/5/9/2N5952.shtml
And here are the ones for the BF245A :
http://www.datasheetcatalog.com/datasheets_pdf/B/F/2/4/BF245A.shtml
I can see that for BF245A rds(on) = 200 Ohms (Vgs=0, fig. 20 on Philips datasheet) and for 2N5952 rds(on) = 300 Ohms (Vgs=0, Central Semi datasheet). I guess that, considering the characteristics spread between specimens, can be considered as pretty equivalent. But I don't have the rest of the graphic for the 2N5952, neither Vp to calculate it (1/rds = (2Idss/Vp²)*(0.5Vc-Vp) ).
My question is : is there another way to find out whether those transistors are equivalent enough or not ? Am I missing something here ?
Best regards.
Eric
I have a dual 1176LN working but without matched transistors for the moment. As I want to use it dual or stereo (I have Hairball's stereo link kit installed), I should use a matched quartett of fets. As I have an order to do at Musikding soon, I saw they have a matched quartett of 2N5952 fets, used as variable resistors in phaser circuits :
http://www.musikding.de/product_info.php/info/p759_2N5952---matched-quartett.html
I looked for the datasheet of both 2N5952 and BF245A to compare them and eventually find out whether they are similar enough or not.
Here are the only two datasheet I could find for the 2N5952 :
http://www.datasheetcatalog.com/datasheets_pdf/2/N/5/9/2N5952.shtml
And here are the ones for the BF245A :
http://www.datasheetcatalog.com/datasheets_pdf/B/F/2/4/BF245A.shtml
I can see that for BF245A rds(on) = 200 Ohms (Vgs=0, fig. 20 on Philips datasheet) and for 2N5952 rds(on) = 300 Ohms (Vgs=0, Central Semi datasheet). I guess that, considering the characteristics spread between specimens, can be considered as pretty equivalent. But I don't have the rest of the graphic for the 2N5952, neither Vp to calculate it (1/rds = (2Idss/Vp²)*(0.5Vc-Vp) ).
My question is : is there another way to find out whether those transistors are equivalent enough or not ? Am I missing something here ?
Best regards.
Eric