EP#45: Zero Sum Resistor Arrays

Podcast Notes

• Parker has a new update to the Jeep Bluetooth Radio Mod. To level shift the Bluetooth audio to what the  TDA7340S expects, Parker is going to build a differential opamp. The Bluetooth audio adapter has a 50mV DC offset and a 1.9V Pk-Pk at max volume where the TDA7429L is expecting a 4.65V DC offset with a 800mV Pk-Pk. See Figure 1.
• Stephen has a crazy idea to make the "ultimate" inexpensive  resistor standard. His plan is to use a big array of resistors that are in parallel/series. He hops that statistically it will swamp out the tolerance. Stephen will use different manufactures to swamp out batch issues. Next week we should have some analysis on this project done.
• Analog-EETimes article: Why the zero-ohm resistor?
• NASA Wants SpacePoop Hackers. Reminds Parker of this Apollo 10 radio transcription. See page 416.
• New Bluetooth 5 spec is  out. Key updates to Bluetooth 5 include longer range, faster speed, and larger broadcast message capacity.
• Samsung exploding battery  update.

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