Comments on: Potato chip to TDR circuit https://www.epanorama.net/blog/2018/10/16/potato-chip-to-tdr-circuit/ All about electronics and circuit design Tue, 14 Apr 2026 18:15:26 +0000 hourly 1 http://wordpress.org/?v=3.9.14 By: Tomi Engdahl https://www.epanorama.net/blog/2018/10/16/potato-chip-to-tdr-circuit/comment-page-1/#comment-1623318 Wed, 30 Jan 2019 12:31:16 +0000 http://www.epanorama.net/newepa/?p=180012#comment-1623318 TDR with different Oscilloscopes.
https://www.youtube.com/watch?v=nHHWYYZdN0A

Trying the TDR ( Time Domain Reflectometer ) with different oscilloscopes. First, the old Tektronix 547 shows it’s stuff, then the TDS220 oscilloscope, soon after.

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2018/10/16/potato-chip-to-tdr-circuit/comment-page-1/#comment-1608699 Wed, 17 Oct 2018 14:01:49 +0000 http://www.epanorama.net/newepa/?p=180012#comment-1608699 https://www.reddit.com/r/electronics/comments/688v3m/potato_semiconductor_you_could_call_the_potato/

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2018/10/16/potato-chip-to-tdr-circuit/comment-page-1/#comment-1608637 Wed, 17 Oct 2018 06:15:18 +0000 http://www.epanorama.net/newepa/?p=180012#comment-1608637 Here is somewhat related article and video using another hex inverter chip from Potato Semi to make an oscillator:

Afroman Makes A UHF Oscillator From A Potato
https://hackaday.com/2017/04/30/afroman-makes-a-uhf-oscillator-from-a-potato/#more-255050

Using one of their 74GU04 parts, he made a ring oscillator relying only on the stray capacitances of its gate inputs for its timing, and while he didn’t manage to achieve a GHz he did measure it at about 373 MHz. He took a look with a spectrum analyser, and as you might expect from a logic circuit found strong harmonics in the GHz range.

Fun with 1.1GHz Potato chips
https://www.youtube.com/watch?v=8rRRvgjLjZU
I built a ring oscillator using a 1.125GHz 74 series logic inverter IC from Potato Semiconductor. It was fun.

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