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Home > The Amp Hour Electronics Podcast > #465 – An Interview with Ted Yapo


	Podcast:		The Amp Hour Electronics Podcast
	Episode:		#465 – An Interview with Ted Yapo
	Category:		Science & Medicine
	Duration:		00:00:00
	Publish Date:		2019-11-03 21:34:13
	Description:		Ted is a fan of soldering AND stock photography Ted is a lifelong electronics hobbyist He studied engineering physics in college. Full color faxes were a thing in Japan but never took off elsewhere. After working on scanning equipment, he moved on to doing networking work. He also did some consulting after Cisco. Mid-way through his career, he went back to graduate school. Wrote a paper about finding telephone wires using LIDAR for helicopter pilots. Transitioned into AR, sort of like Projection Mapping. It was used for architectural daylighting simulation. Going back to school is tough for what you remember. Ted had to relearn linear algebra. He recommends using Gilbert Strang’s lectures, which gave more context. After school, Ted did consulting with a few partners, mostly New England. Ted got started posting to Hackaday with 2016 HaD prize. His first entry was the “Diode clock“, which utilizes the fact that diodes act like switches for RF when you pass DC current through them. “Upping serendipity quotient” Using diodes as an AND gate Using pin diodes for a doppler radio project 1n4007 can act as a crude pin diode at certain frequency Built digital clock that uses diodes for the counters Assembly instructions – 46 boards! Power supply is around 6 MHz One of his other popular projects is the Tritiled, which helps figuring out where things are in the dark Based around the idea of tritium lights Modern LEDs are extremely efficient at a certain current Droop happens at higher currents The 8 GHz sampling oscilloscope is a more recent project Research came out of the diode clock Schottky diodes for sampling Tek S4 sampling head 14.5 GHz Diodes can switch in 10-15 pS Stroboscopic effect Equivalent time sampling Tek 11801 from 1989 Nyquist still applies Verifying on the bench is difficult Paper from picosecond pulse lab Jim Williams using an avalanche diode or a step response diode Looking at RMS error Another architecture 1975 by SP McCabe Using a fast comparator to sample waveform, similar to a successive approximation ADC ADCMP582 That’s the time base calibration What will people be able to build with an 8 GHz scope? Using it to measure transmission lines on PCB boards Using Time Domain Reflectometry Ted has a splitter TDR head Tracking generator + Spectrum analyzer = Scalar network analyzer Rigol came out with cheap spectrum analyzer, DSA815, Ted got one of the early units Tracking generator outputs signals that are the same as the frequency on the spectrum analyzer Ted gave a talk about this at last year’s Hackaday Superconference There is no phase in an SNA SNAs are harder to calibrate Paper was about how to do two measurements to compensate for errors in the generator Chris has a friend doing Python scripting on test equipment via their ethernet jacks. You can find Ted on Twitter, Hackaday.io and as a writer for Hackaday
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