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fix circuit diagram

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Daniella / Tove 2023-05-01 21:25:15 +02:00 • committed by GitHub
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README.md
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@ -39,21 +39,18 @@ AM signal on pin 15.
## Circuit Diagram and explanation ## Circuit Diagram and explanation
![Image of circuit diagram](https://media.discordapp.net/attachments/1077080199847489626/1102203487363792956/SmartSelect_20230430_140248_Flexcil.jpg) ![Image of circuit diagram](https://user-images.githubusercontent.com/48156391/235515258-df6d10fa-90f5-4997-813d-1cf969dbf8a0.png)
The part which prepares the audio for the pico is not strictly needed, but if you use line inputs, you reeeally should have it. The part which prepares the audio for the pico is not strictly needed, but if you use line inputs, you reeeally should have it.
It has the following jobs: It has the following jobs:
- R2 and R3 try to pull AI- a between the two voltages to be able to record the whole signal in case it is not a grounded one (not needed,
it can also just be connected to ground. this is basically just extra fanciness with nonzero but very small benefit.)
- R1 makes sure there isn't too much strain put on the input
- D1 and D2 clamp the signal to acceptable voltages - D1 and D2 clamp the signal to acceptable voltages
- **An extra resistor of about 50-100 ohms may be added from the AI+ point to the AI- point to load the signal.** This is optional, but - **An extra resistor of about 50-100 ohms may be added from the AI+ point to the AI- point to load the signal.** This is optional, but
*can* clean up a little bit of noise if you have long cables. *can* clean up a little bit of noise if you have long cables.
**ERRATA :warning:**<br> **ERRATA :warning:**<br>
If you aren't an asshole, ***PLEASE*** add the low pass filter as mentioned in the Disclaimer: If you aren't an asshole, ***PLEASE*** add the low pass filter as mentioned in the Disclaimer:
- Add a 100ohm resistor between pico and antenna - Add the 100ohm resistor (R3 in new schematic) between pico and antenna
- Wire a 2nF (2000pF) capacitor between the new start of the antenna and ground - Wire a 2nF (2000pF) capacitor (C1 in new schematic) between the new start of the antenna and ground
## How to use it ## How to use it