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Team 4. The Beancounters Ethan Price, Shicheng Guo, Wesley Tso, Kyle Haver. Solid State Relay Considerations. Control signals need minimal amounts of current: ~30mA. Standard 10mil trace will suffice

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team 4

Team 4

The Beancounters

Ethan Price, Shicheng Guo, Wesley Tso, Kyle Haver

solid state relay considerations
Solid State Relay Considerations

Control signals need minimal amounts of current: ~30mA. Standard 10mil trace will suffice

SSR1: Mounted on the PCB, will have to pass 1.7A of 20VDC for the fan. This will need to have >50mil traces and molex connectors, plus etxra space between traces

SSR2: Mounted separately from PCB

i2c considerations
I2C Considerations

100KHz operation; noise, impedance, and signal length possible concerns (rated to ~1m)

Rule of thumb: <1/10 of wavelength, transmission line effects not a concern

I2C fall time is about 100ns = 5MHz

Wavelength@5MHz = ~100meters

We're well under 10 meters, not concerned

power supply
Power Supply
  • Conversion: 12.6VAC -> ~12VDC -> 5VDC
  • As with SSR, needs to be relatively isolated
  • 7805 will need heatsink, so some keepout area will be needed

Header pins are rated at 1A each, should be sufficient for power supply

microcontroller
Microcontroller

All voltage pairshave decoupling caps, need to be placed nearby

Want to attempt to keep uC and headers away from switching noise of amplifier and transistors

Crystal and associated caps are slammed up against the microcontroller