Circuit Break - A MacroFab Podcast
Trailer
Bonus
Episode 45
Season 1
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.