Transistor as a switch

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kiwi101

Joined Feb 18, 2014
38
Hey guys about a month ago you helped me come up with a schematic for 16 LED's which light up with the help of a dipswitch but the schematic doesn't seem to be working.
Forward current max.: 30mA·
Forward voltage max.: 2.5V·
Reverse voltage max.: 5V
limiting resistor= [V(s) - [Vd + Vd + Vd + Vd]]/I = [12-8.8]/.02 = 160 Ohms
wattage value is .064
 

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ericgibbs

Joined Jan 29, 2010
18,766
My Professor want us to use transistors its more for the learning experience
hi,
I would suggest that first you look at powering only one LED with a transistor and using a dip switch to control the transistor base.

Post a circuit showing how you think this could be done.:)
 
Last edited:

wayneh

Joined Sep 9, 2010
17,496
And consider NOT connecting all the switch outputs - and transistor bases - together. Separating them will allow individual control over each string of LEDs. Think about what is on the other side of that switch. What is the input?
 
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