If i wan't to post a schematic and PCB? How?

sonnya · 5th January 2002, 02:21 PM

I have made a JFET/Bipolar "OPAMP" where it is possible to mount different parts and test them. I am going to build it in the next days with J113(low noise ~ 3nV@1KHz) and 2n5401/2n5551 (Fairly linear current gain).

There is nothing speciel about it. Singleside PCB wich is easy to make your self (Wide tracks).

Size of the board is 55 by 81 mm.

I know i can insert a image but how?

Sonny

Freddie · 5th January 2002, 02:55 PM

Choose "Attach file".. Valid file extension are: gif, jpg, png, txt, zip bmp, jpeg.

/Freddie

sonnya · 5th January 2002, 04:35 PM

Okay then i have to scan them. I will post it on monday .. i think.

It is mostly made for testing JFET's.

I can mount J201 - J204, J111 - j113 and if you twist the pin's even Dual Monolothic like U401 - u404.
I have both the U404 and the J113. The last one i have matched to IDSS difference of only 0.5% and 10mV difference in VGS @ ID = 4mA.

It is made as a OPAMP, so you have make the feedback loop outside the board if you want to do that

I think my CD-player is getting a 8 holes in the chassis!

but it don't know it yet!

Sonny

sonnya · 6th January 2002, 08:28 PM

SCM : mmmhhhh!!! Sorry but 100K file limit!!!!

5th January 2002, 02:21 PM	#1
sonnya diyAudio Member Join Date: Oct 2001 Location: Denmark	If i wan't to post a schematic and PCB? How? I have made a JFET/Bipolar "OPAMP" where it is possible to mount different parts and test them. I am going to build it in the next days with J113(low noise ~ 3nV@1KHz) and 2n5401/2n5551 (Fairly linear current gain). There is nothing speciel about it. Singleside PCB wich is easy to make your self (Wide tracks). Size of the board is 55 by 81 mm. I know i can insert a image but how? Sonny

5th January 2002, 04:35 PM	#3
sonnya diyAudio Member Join Date: Oct 2001 Location: Denmark	Jfet/bipolar PCB and Schematic Okay then i have to scan them. I will post it on monday .. i think. It is mostly made for testing JFET's. I can mount J201 - J204, J111 - j113 and if you twist the pin's even Dual Monolothic like U401 - u404. I have both the U404 and the J113. The last one i have matched to IDSS difference of only 0.5% and 10mV difference in VGS @ ID = 4mA. It is made as a OPAMP, so you have make the feedback loop outside the board if you want to do that I think my CD-player is getting a 8 holes in the chassis! but it don't know it yet! Sonny

6th January 2002, 08:28 PM	#4
sonnya diyAudio Member Join Date: Oct 2001 Location: Denmark	Here it comes (Some of it!) SCM : mmmhhhh!!! Sorry but 100K file limit!!!!

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5th January 2002, 02:55 PM	#2
Freddie diyAudio Member Join Date: Oct 2000 Location: Sweden	Choose "Attach file".. Valid file extension are: gif, jpg, png, txt, zip bmp, jpeg. /Freddie

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