Aug 20, 2020
236: The Concept of Delayed Gratification (Repeat)
Play episode · 1 hr 10 min

Roger Linn (@roger_linn) gave us new ideas about musical instruments, detailing how wonderful expressive control, 3D buttons, and keyscanning can be.

Roger’s company is Roger Linn Design. We talked extensively about the LinnStrument, some about the AdrenaLinn for guitar, and only a little bit about the analog drum machine Tempest.

A key matrix circuit is a popular way to handle a large number of buttons but it falls prey to n-key rollover. Roger adds force sense resistors to this (FSR example at Sparkfun).

If you have an idea for an instrument, Roger has already written his response to your request for a prototype. Roger gave a keynote address at ADC '16 about the LinnStrument, including showing the sounds it can make.

OHMI Trust is the one handed musical instrument society enabling music making for everyone.


Roger mentioned some other expressive instruments including:

MacroFab Engineering Podcast
MacroFab Engineering Podcast
MacroFab, INC.
MEP EP#246: Doing Something Magical
MEP EP#246: Doing Something Magical Parker * Physicists build circuit that generates clean, limitless power from graphene * University of Arkansas physicists * Energy harvesting the thermal motion of graphene * Without getting all quantum about it, it seems to work by configuring the graphene as one electrode (or both) of a capacitor. As the graphene flaps in the breeze (actually Brownian motion, I assume), the changing geometry will change the capacitance. * The team's next objective is to determine if the DC current can be stored in a capacitor for later use * Youtube video Stephen * New test equipment design - picking the right opamp * Current sensing with a bit of a twist * Powered by +/-12V * Need to read current on the +12 and the -12 along with a +9V rail * Opamp needs to be capable of reading a voltage drop in an environment where the common mode voltage is at or near the opamp supply voltage * Current sense amplifiers * INA1x9 series amplifiers from TI * Supply and common mode range are independent of each other * 2.7v to 60v * Convert a voltage to a current then change the gain by selecting an appropriate load * Iphone 12 doesn’t come with a charger? * Are chargers necessary? * Don't we have like 300 of them lying around? * Apple states environmental reasons for dropping the charger * Also no earbuds * Examples of other products that lack the equipment necessary to function * Video game consoles? * Appliances? * Internet router?
41 min
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