APA Electronic, APA-102C-5050 256, APA-104-260-5050, Component Shelf Life, Copper Donuts, electronics podcast, ESP8266, EU bans lead solder, J111, MacroAmp, MacroFab, macrofab engineering podcast, PinoTaur, SLO, UL Certification

<img src="https://mxcdn.macrofab.com/wp-content/uploads/2019/04/mep169FI.png" class="attachment-post-thumbnail size-post-thumbnail wp-post-image" alt="engineering podcast" srcset="https://mxcdn.macrofab.com/wp-content/uploads/2019/04/mep169FI.png 900w, https://mxcdn.macrofab.com/wp-content/uploads/2019/04/mep169FI-250x111.png 250w, https://mxcdn.macrofab.com/wp-content/uploads/2019/04/mep169FI-768x341.png 768w, https://mxcdn.macrofab.com/wp-content/uploads/2019/04/mep169FI-700x311.png 700w, https://mxcdn.macrofab.com/wp-content/uploads/2019/04/mep169FI-600x267.png 600w, https://mxcdn.macrofab.com/wp-content/uploads/2019/04/mep169FI-120x53.png 120w" sizes="(max-width: 900px) 100vw, 900px" />

engineering podcast

Podcast

169

Parker Dillmann | April 24, 2019

MEP EP #169: Is “I’m an Engineer” a valid defense?

Podcast Notes

Parker

PinoTaur Update
- 12V master voltage input
- Switching psus for the voltage rails
- ATSAMD21G18A Breakout Board
  - 32.768KHZ is the external crystal?
Lead free Smart LEDS?!
- Direct from APA Electronic
- APA-102C-5050 256
- APA-104-260-5050

Stephen

Macroamp Update
- Tested preamp board
  - ~42x gain which is much too high
  - Power supply resistance is way too high at 2k
    - Did not account for extra current draw from buffer Jfets
  - J111 Jfet was bad out of the box – Have replaced with a BJT
  - So far very low noise
  - Riaa input filter still to be tested however it all works
Tested Shielded cable footprint from MEP EP 155: Void Copper Donuts
- Was a Success!

R.F.O.

Hack my House: UL Certification and Turning the lights on with an ESP8266
- What is the legality of IOT and connecting them to Mains?
Component Shelf Life: How To Use All That Old Junk
- How to know when your parts are bad?
- How old is too old?
- Surplus Stores
EU bans lead solder for real this time
- Lead has been newly classified by the EU as toxic to reproduction as of March 201
- This means it can no longer be sold to the general public, only to commercial users
- The transitional period ended Feb 28, 2019

Visit our Public Slack Channel and join the conversation in between episodes!

<img aria-describedby="caption-attachment-4973" class="wp-image-4973 size-large" src="https://mxcdn.macrofab.com/wp-content/uploads/2019/04/Schematic-2-700x382.png" alt="Schematic for the ATSAMD21G18A breakout board." width="700" height="382" srcset="https://mxcdn.macrofab.com/wp-content/uploads/2019/04/Schematic-2-700x382.png 700w, https://mxcdn.macrofab.com/wp-content/uploads/2019/04/Schematic-2-250x136.png 250w, https://mxcdn.macrofab.com/wp-content/uploads/2019/04/Schematic-2-768x419.png 768w, https://mxcdn.macrofab.com/wp-content/uploads/2019/04/Schematic-2-600x328.png 600w, https://mxcdn.macrofab.com/wp-content/uploads/2019/04/Schematic-2-120x66.png 120w, https://mxcdn.macrofab.com/wp-content/uploads/2019/04/Schematic-2.png 1024w" sizes="(max-width: 700px) 100vw, 700px" />

Schematic for the ATSAMD21G18A breakout board.

Schematic for the ATSAMD21G18A breakout board.

<img aria-describedby="caption-attachment-4970" class="wp-image-4970 size-large" src="https://mxcdn.macrofab.com/wp-content/uploads/2019/04/board-700x325.png" alt="PCB layout for the ATSAMD21G18A breakout board. USB Type-C!" width="700" height="325" srcset="https://mxcdn.macrofab.com/wp-content/uploads/2019/04/board-700x325.png 700w, https://mxcdn.macrofab.com/wp-content/uploads/2019/04/board-250x116.png 250w, https://mxcdn.macrofab.com/wp-content/uploads/2019/04/board-768x357.png 768w, https://mxcdn.macrofab.com/wp-content/uploads/2019/04/board-600x279.png 600w, https://mxcdn.macrofab.com/wp-content/uploads/2019/04/board-120x56.png 120w" sizes="(max-width: 700px) 100vw, 700px" />

PCB layout for the ATSAMD21G18A breakout board. USB Type-C!

PCB layout for the ATSAMD21G18A breakout board. USB Type-C!

<img aria-describedby="caption-attachment-4969" class="wp-image-4969 size-large" src="https://mxcdn.macrofab.com/wp-content/uploads/2019/04/copper-donut-700x431.png" alt="Stephen's copper donut for soldering COAX cable to PCBs. " width="700" height="431" srcset="https://mxcdn.macrofab.com/wp-content/uploads/2019/04/copper-donut-700x431.png 700w, https://mxcdn.macrofab.com/wp-content/uploads/2019/04/copper-donut-250x154.png 250w, https://mxcdn.macrofab.com/wp-content/uploads/2019/04/copper-donut-768x473.png 768w, https://mxcdn.macrofab.com/wp-content/uploads/2019/04/copper-donut-600x370.png 600w, https://mxcdn.macrofab.com/wp-content/uploads/2019/04/copper-donut-120x74.png 120w, https://mxcdn.macrofab.com/wp-content/uploads/2019/04/copper-donut.png 1024w" sizes="(max-width: 700px) 100vw, 700px" />

Stephen's copper donut for soldering COAX cable to PCBs.

Stephen’s copper donut for soldering COAX cable to PCBs.

<img aria-describedby="caption-attachment-4968" class="wp-image-4968 size-large" src="https://mxcdn.macrofab.com/wp-content/uploads/2019/04/SLO-700x252.jpg" alt="Inside the amplifier Stephen rebuilt recently. Mike Ikes for resistors and capacitors!" width="700" height="252" srcset="https://mxcdn.macrofab.com/wp-content/uploads/2019/04/SLO-700x252.jpg 700w, https://mxcdn.macrofab.com/wp-content/uploads/2019/04/SLO-250x90.jpg 250w, https://mxcdn.macrofab.com/wp-content/uploads/2019/04/SLO-768x276.jpg 768w, https://mxcdn.macrofab.com/wp-content/uploads/2019/04/SLO-600x216.jpg 600w, https://mxcdn.macrofab.com/wp-content/uploads/2019/04/SLO-120x43.jpg 120w, https://mxcdn.macrofab.com/wp-content/uploads/2019/04/SLO.jpg 1024w" sizes="(max-width: 700px) 100vw, 700px" />

Inside the amplifier Stephen rebuilt recently. Mike Ikes for resistors and capacitors!

Inside the amplifier Stephen rebuilt recently. Mike Ikes for resistors and capacitors!

<img aria-describedby="caption-attachment-4974" class="wp-image-4974 size-large" src="https://mxcdn.macrofab.com/wp-content/uploads/2019/04/amp-700x933.jpg" alt="Stephen's amplifier put together and working. Here Stephen is recording the output with a microphone." width="700" height="933" srcset="https://mxcdn.macrofab.com/wp-content/uploads/2019/04/amp-700x933.jpg 700w, https://mxcdn.macrofab.com/wp-content/uploads/2019/04/amp-250x333.jpg 250w, https://mxcdn.macrofab.com/wp-content/uploads/2019/04/amp.jpg 768w, https://mxcdn.macrofab.com/wp-content/uploads/2019/04/amp-600x800.jpg 600w, https://mxcdn.macrofab.com/wp-content/uploads/2019/04/amp-120x160.jpg 120w" sizes="(max-width: 700px) 100vw, 700px" />

Stephen's amplifier put together and working. Here Stephen is recording the output with a microphone.

Stephen’s amplifier put together and working. Here Stephen is recording the output with a microphone.

Special thanks to whixr over at Tymkrs for the intro and outro!

About The Hosts

Parker Dillmann is MacroFab's Co-Founder, and Lead ECE with backgrounds in Embedded System Design, and Digital Signal Processing. He got his start in 2005 by hacking Nintendo consoles into portable gaming units. He also runs the blog, longhornengineer.com, where he posts his personal projects, technical guides, and appnotes about board layout design and components. Parker graduated with a BS in Electrical and Computer Engineering from the University of Texas.

Stephen Kraig began his electronics career by building musical oriented circuits in 2003. Stephen is an avid guitar player and, in his down time, manufactures audio electronics including guitar amplifiers, pedals, and pro audio gear. Stephen graduated with a BS in Electrical Engineering from Texas A&M University.