Michael McGrath mam1021@psu.edu 724-456-0657 Simple DC Motor Michael McGrath mam1021@psu.edu 724-456-0657.

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Presentation transcript:

Michael McGrath mam1021@psu.edu 724-456-0657 Simple DC Motor Michael McGrath mam1021@psu.edu 724-456-0657

Vibrating Pager Motor

Design Flow Transistor Motor Digital Logic

Digital Logic 74 LS 04 Hex Inverter 14 Pin DIP 6 Individual Gates Input 0 Output 1 Input 1 Output 0 14 Pin DIP 6 Individual Gates

Transistor 2N2222A 3 Pins Base Emitter Collector Collector Base

How The Transistor Works As a switch, needs 5v to turn on. Using the Transistor as a current Amp Ice = β * Ibe If No Tec. Docs safe assumption β = 100

What Value for R? VCC DC Motor Digital Logic R?

Answer = 3.233KΩ R? VCC DC 5V Motor Diode Digital .7V Drop Logic 5V - .7V = 4.3V V=IR 4.3V / (100 /β) = 4.3/1.33 = 3.233KΩ

Prices 74LS04 $0.50 2N2222A $0.25 Resistor Cheap!! Motor $1 - $5 Overall cost < $5

Propagation Delay 74LS04 12-22 ns 2N2222A 250 ns

Typical Application Transistor DC Motor Current Amp to drive a motor or other from digital logic device Can be used as a cheap switch DC Motor Pager Vibrator RC Car Motor Millions of uses