| Electronics > Beginners |
| Need trouble shooting help (pics) |
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| madires:
If the goal isn't to explain a BJT emitter follower then an n-channel MOSFET would be a much better choice. |
| billbyrd1945:
So much help is flowing in that it's hard to keep up with my "thank you's". I've looked back over my post and don't see the decimal goof. Wouldn't be the first time I couldn't find something though. I love the idea of the CFL diode. I may just sacrifice one if I get to antsy to wait for my order to come in. Also may try the MOSFET route. I need to know how to use those too. |
| ArthurDent:
I see the current in question as ".056Ma" when it should have been .056A. The difference between Ma and Amps. 56Ma would have been correct. I knew what you meant. |
| billbyrd1945:
Eureka (sort of)! This is the wiring schema suggested by Arthur. It positively works in the sense that it doesn't run on the 12VDC until turned on by the 5VDC. I don't yet know how to read a datasheet well enough to know if this transistor (c945 b444) is rated for this kind of load. I used it because I found in in the junk drawer and don't yet have my PN2222A as used in the YouTube video (the build that I wish to replicate). Readers should also know that I connected it incorrectly before I realized that the collector and base for this transistor are NOT ebc but, rather, ecb. Doing so made the transistor too hot to touch. So the pulsating (when correctly wired) may somehow be related to this. What do you think? Also suspect that the innards of the motor may be less that securely affixed. All things considered, though, I'm tickled sh*tless just to see some kind of a transistor behave in the way that is should. See video at https://youtu.be/k0bCO1eJzIo http://pdf1.alldatasheet.com/datasheet-pdf/view/82713/ETC/C945.html |
| billbyrd1945:
"I see the current in question as ".056Ma" when it should have been .056A. The difference between Ma and Amps. 56Ma would have been correct. I knew what you meant." Ah! I see what you mean. I used the wrong label. |
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