EP#47: Missing Audio

EP#47: Missing Audio

Podcast Notes

  • Continuing on the Jeep Bluetooth radio hack, Parker designed the audio voltage bias switcher board. It will adjust the Pk-Pk voltage and DC offset of the Bluetooth adapter to what the radio expects. Ordered it through MacroFab. See Figure 1 and 2.
  • Parker also started designing an amplifier for Spooky Pinball. Based on the TDA7387 which is a 4 x 41 W quad bridge car radio amplifier. Designing it to be as inexpensive but as LOUD as possible. Currently down to $15.91 an assembled board in QTY 500. Need a beefy heatsink and powersupply to handle it.
  • Stephen has been working on his Resistor of Death (name to be decided). By combining resistors in series and parallel, Stephen will be able to make a large high tolerance resistor. The best tolerance resistor on mouser is 0.005%. Can we get better than that with 1% resistors? N = 1/0.005 = 200 resistors FOR EACH PARALLEL/SERIES COMBO Total resistors = 40,000.
  • Sorry RFO section got cut off due to a problem in the software recording. :(

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

Jaksot(448)

EP#16: Fixtures of Echoing Tubes

EP#16: Fixtures of Echoing Tubes

Hosts: Parker Dillmann Stephen KraigGuests: N/A Figure 1: Non working Space Echo RE-201 Figure 2: A NuTube 6P1 straight from KORG. Figure 3: The constant current source Stephen is using for his NuTub...

20 Touko 201643min

EP#15: Ridiculously Blinking LED

EP#15: Ridiculously Blinking LED

Hosts: Parker Dillmann Stephen KraigGuests: N/A Figure 1: SSPS front panel test layout. Miniature version of the real front panel to test physical placement and new parts. Figure 2: Two TPS65982-EVM b...

13 Touko 201633min

EP#14: Discrepant Diodes

EP#14: Discrepant Diodes

Hosts: Parker Dillmann Stephen KraigGuests: N/AFigure 1: SSPS front panel layout. Traces to come soon. Figure 2: Inconsistencies in the LTST-C171CKT datasheets.Podcast NotesStephen is still working on...

6 Touko 201635min

EP#13: Picture Books for Engineers

EP#13: Picture Books for Engineers

Podcast NotesOur guest this week is Dustin Holliday, a Production Line Engineer at MacroFab, INC. Dustin programs the My200 paste jetter, the My500 pick and place, and the Rhythm Selective Solder. See...

29 Huhti 201640min

EP#12: Silicon Condensors

EP#12: Silicon Condensors

Podcast NotesStephen built a power supply for an old school tube microphone for Josh. Josh does the recordings for the Podcast. See Figure 1 for the schematic.Microphone is a Sony C37 tube condenser m...

22 Huhti 201630min

EP#11: False Fuses and Kitschy Kickstarters

EP#11: False Fuses and Kitschy Kickstarters

Podcast NotesParker has been hard at work on the PinHeck Test Fixture. It uses over 160 pogo pins to test every single function of the PinHeck Pinball System. There will be an article about designing ...

15 Huhti 201637min

EP#10: IoT’s Cloudy Future

EP#10: IoT’s Cloudy Future

Podcast NotesFirst Guest for the MacroFab Engineering Podcast! Trey German is working on a IoT platform using BLE and a small coin cell.Trey's device worked on the first revision! How often does that ...

8 Huhti 201641min

EP#9: Robots with Feelings

EP#9: Robots with Feelings

**Podcast Notes*** Parker and Stephen continue work on the [Super Simple Power Supply](https://github.com/MacroFab/SSPS). There is a full on simulation of the analog section on MultiSim.* Stephen foun...

1 Huhti 201636min

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