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Administrative stuff

Administrative stuff. Turn in your HW #3! Here is HW #4! Due on 27 July (last day of class) Your 5 minute presentation will be on 27 July (last day of class) Clay will go over any last details and questions you have on Monday. The basics. Ohms Law: Electrical Power:

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Administrative stuff

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  1. Administrative stuff • Turn in your HW #3! • Here is HW #4! Due on 27 July (last day of class) • Your 5 minute presentation will be on 27 July (last day of class) • Clay will go over any last details and questions you have on Monday

  2. The basics • Ohms Law: • Electrical Power: • You can combine the two to find necessary constraints based off your requirements:

  3. Multiple resistors • Parallel resistors work to reduce overall resistance • Series resistors add up to increase overall resistance

  4. Electrical symbols • Resistors – • Capacitors – • LED – • Ground –

  5. Breadboards

  6. Breadboards

  7. Light up an LED • What happens if you don’t have a resistor? • What happens when you change the resistor?

  8. Capacitor • A way of storing charge – higher value means more charge • Pushing button causes current to flow & capacitor charges • Releasing button allows capacitor to discharge – LED fades out instead of immediately turning off

  9. The 555 timer • We will be doing a few simple examples with this chip • Used in a variety of applications, including timing and oscillators • Sends pulses based on a voltagethreshold • Another example of engineerscreating something new

  10. The 555 timer • Note the pin numbering scheme! This is important for the circuit!

  11. Pulsing LED

  12. Pulsing LED • Internal switching causes the voltage out to be on or off – square wave

  13. Music notes • Internal switching causes the voltage out to be on or off

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