---
title: "DIY Active Differential Probe Project"
description: "Back when I worked for an Oscilloscope company, we were pretty proud of our differential probes. Even the \"low-bandwidth\" probes were still around 1GHz of bandwidth.…"
canonical: "https://www.baldengineer.com/diy-active-differential-probe-project.html"
author: "James Lewis"
date: "2015-01-27T15:28:50Z"
lastmod: "2015-01-26T21:36:01Z"
categories: ["around-the-web","test-equipment"]
tags: []
---

# DIY Active Differential Probe Project


[![Active Probe Setup (via xellers)](/wp-content/uploads/2015/01/active-probe-freq-response-measurement-1024x683.jpg)](/wp-content/uploads/2015/01/active-probe-freq-response-measurement-1024x683.jpg)

Active Probe Setup (via xellers)


Back when I worked for an Oscilloscope company, we were pretty proud of our differential probes.  Even the "low-bandwidth" probes were still around 1GHz of bandwidth.

[Daniel Kramnik](https://xellers.wordpress.com) built an active differential probe and looks like he is seeing about 400MHz usable bandwidth.  And really, it looks relatively flat.  Not bad for a DIY effort.  I'm impressed.

Pretty amazing to think about the possibility of building your own (active) scope probes.

[Read his full writeup](https://xellers.wordpress.com/2014/09/28/diy-active-differential-probe-characterization-round-2/).