The .jpg images give the 1:1 PCB layout in A4 size suitable for fabrication using the toner transfer method.

The TOP layer is given mirrored and the BOTTOM is normal.

The component placement is shown.
<p>Yes you can use 2 LM741's instead of the LM747 but you will need to make the appropriate connections. </p><p>The 741/747 need +/- 9 V supply typically. </p><p>This scheme should comfortably work for signals down to 100mV.</p>
<p>Best part of this scope is that it comes with internal variable gain system. I was planning to make a separate variable gain circuit with another scope instructable and I came across this instructable. A big thank you for that :-)</p>
<p>Hi,</p><p>1-Can I use 2 LM741 instead of single LM747 , I hope the function is same?</p><p>2- What is the min Vcc required for these amplifiers? I want to make a scope for low voltage signals(&lt;2V).</p>
<p>Great Job. Very clear and helpful instructable. You are my hero!!! <br>I wish you had data file for this PC board, do you?</p>
how can i get the schematic from here?
Thank You for your interest. I am providing a higher resolution version of the schematic file here.
I expect the gain to be changed frequently, so wouldn't a rotary switch be better?<br><br>Is the 747 fast enough?<br><br>
Thanks for the great response!<br> <br> I find the DC offset in the X 10 gain is high and have changed the LM747, U1 to the LF353 using an 8Pin to 14Pin converter. The LF353 pins need to be bent upwards delicately and the converter leads soldered on. Plug this into the U1 socket. It works fine now.
Some video of the device working? <br>download links? <br>the project is good but needs some more work<br><br>You're doing great, keep it up ^^

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Bio: I am a retired Electronic Systems Engineer now pursuing my hobbies full time. I share what I do especially with the world wide student community.
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