Products > Test Equipment

DC coupled 2.7 GHz Active Probe Project - Now Available!

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KungFuJosh:
I want one. I don't ever measure anything that I really need an active probe for, but that looks cool. 😉

lasmux:
Thanks :)

It's quite good as a general purpose high-speed probe, of if you want to measure a moderately fast or high impedance signal... but yes, it's not for everyone.

I was also wondering if it could be used as a sensor preamp, perhaps for a high-speed photodiode or something.

mawyatt:

--- Quote from: Weston on July 22, 2023, 11:36:49 pm ---Really cool work! It looks like the plastic for the probe tip is injection molded? Thats a lot of commitment.

Have you considered selling this through crowd supply? There might be a bit of product testing required (CE certification), but Crowd Supply provides a direct path to distribution though Mouser. It's also a lot easier to not have to deal with fulfillment yourself and the crowdfunding model removes any monetary risks with fronting money for parts. Its now discontinued, but I sold the Little Bee current probe through Crowd Supply and it was a great experience https://www.crowdsupply.com/weston-braun/little-bee

Is the probe stable with an AC coupled 50 ohm termination? A lot of equipment, such as VNAs/Spectrum Analyzers have an AC coupled 50 ohm termination. You obviously don't need a probe that works down to DC for that, but this would be a cost effective high impedance probe.

--- End quote ---

We have the Little Bee B1, don't use it much, but when we need to measure smaller currents it's served well  :)

Thanks for the product :-+

Best,

mawyatt:
@ lasmux,

Nice project, well done :-+

We didn't know about the MJF printing, that case looks very nice indeed!!

You certainly picked up on the Fusion 360, and produced a nice rendering as well!!

A question, why the selection of 26dB rather than 20dB attenuation?? Guessing limits of the +-2.5V supply rails?

Best,

nctnico:
1:10 for the probe and another 1:2 for the 50 Ohm termination makes 26 dB.

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