Podcast
47

MEP 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. 🙁

Download: MP3
RSS Feed: Link

Runtime: (14:59)

Hosts:
Parker Dillmann
Stephen Kraig

Guests:
N/A


Figure 1: Schematic for the level shifter Jeep Bluetooth audio switcher.
Figure 1: Schematic for the level shifter Jeep Bluetooth audio switcher.
Figure 2: Jeep BT Switcher ordered through MacroFab.
Figure 2: Jeep BT Switcher ordered through MacroFab.

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