Electronics > Beginners
Need trouble shooting help (pics)
billbyrd1945:
Oh wow! I love that!
billbyrd1945:
"Er.... I'll wager it draws quite a bit more than that when supplied with 12 volts, or even 5 volts."
See photo.
billbyrd1945:
You are too cool to do that for me! Thanks Arthur. Transistors ordered. Replicating your drawing will be my first order of business.
alsetalokin4017:
--- Quote from: billbyrd1945 on February 23, 2019, 04:07:49 am ---"Er.... I'll wager it draws quite a bit more than that when supplied with 12 volts, or even 5 volts."
See photo.
--- End quote ---
Yes... and in your original post you said it drew .056 mA. A thousand times less than what it actually draws. Thank you for confirming that you originally misplaced the decimal point.
--- Quote from: billbyrd1945 on February 21, 2019, 04:39:05 am ---I goofed by not giving enough information. The video was https://www.youtube.com/watch?v=8DMZSxS-xVc. And I used the same transistor (PN2222A). The motor I have just happens to draw .056mA, the same as the solenoid he used. And yes, it does run properly on 12V. After I accidently smoked my only 2222, I found the 9014 in my limited inventory. At any rate, they both perform the same. That is, the motor only gets the 5v. My understanding was/is that the 5v turns on the base so that the 12v flows to the motor. My amateur diagram may not be representative of the actual circuit I built, or what the YouTuber built. But I can't point to any difference in my actual physical circuit. Maybe I've given enough additional info for you guys to help. Thanks for all the responses. I need to go back and study them more. Wanted to get this out before hitting the sheets. (Revised diagram attached)
--- End quote ---
alsetalokin4017:
Often a "12 volt" can motor needs a little manual help to start running when it is supplied with much less voltage. Your original circuit could be "working" but the motor might simply be stalled. Try giving it a spin with your fingers.
Also, if you have any old CFL light bulbs or computer power supplies hanging around, you can scavenge lots of useful parts from them. The transistors in a CFL would work well for this demonstration.
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