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LCS-1M - A Full-Featured, Low-Cost Hobby Oscilloscope

Step 12Breadboard Version

Breadboard Version
Initially I built up the scope on a standard breadboard. This allows for easy troubleshooting, adding and removal of components, trying out new ideas and alternative solutions, etc. Plus it looks really nerdy. I would have never succeeded in getting the scope to work with any other approach. I simulated the sample logic on the computer first, but reality always has a few surprises. Also I love being able to tweak the analog section until the signal path is clean and has the required performance.

The picture below is a fully functional single-channel development version. Looks messy but worked perfectly fine, apart from somewhat higher noise on the signals, and slightly less reliable trigger (because the power supply lines are quite inductive, so the trigger created transients on them). Creating the final schematic was then simply a question of copying the existing circuit piece by piece.
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Author:womai