Tutorial 5 the NPN Transistors

dirtdiver over 14 years ago

I cant seem to find a 2N70522N7052 npn transistor (the one used it the video for the dc motor)

BIPOLAR TRANSISTOR, NPN, 100V
Transistor Polarity: NPN
Collector Emitter Voltage V(br)ceo: 100V
Transition Frequency Typ ft: 200MHz
Power Dissipation Pd: 625mW
DC Collector Current: 1.5A
DC Current Gain hFE: 10000
RoHS Compliant: Yes

Can I use a different one?

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MDeGrauw over 14 years ago +1

Check at bf.farnell.com I guess they will have it in catalog.
MDeGrauw over 14 years ago in reply to MDeGrauw +1

Sorry bg.farnell.com
dmaruska over 14 years ago in reply to dirtdiver +1

Yes, it will work with different transistor with similar specifications as original. This transistor will act as the low voltage and low current to high voltage and high current bridge. Just insure the…

MDeGrauw over 14 years ago

Check at bf.farnell.com
I guess they will have it in catalog.
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MDeGrauw over 14 years ago in reply to MDeGrauw

Sorry bg.farnell.com
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dirtdiver over 14 years ago in reply to MDeGrauw

I found it BUT its going to cost me 20$ to deliver it, the transisitr is 0.7$
will it work if I get different transistor with the same characteristics (and if yes wich of them are important in my case)
thanks in advance!
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dmaruska over 14 years ago in reply to dirtdiver

Yes, it will work with different transistor with similar specifications as original. This transistor will act as the low voltage and low current to high voltage and high current bridge. Just insure the current of the transistor is NOT less than the motor you’re going to drive. If you are going to PWM the motor, insure the transistor will operate correctly with the frequency you will be at.

Dave M.
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dirtdiver over 14 years ago in reply to dmaruska

so I'm gonna be using a dc motor (just like in the tutorial-with the diod and the capasitor) That motor is consuming 70 mA so I need a transistor that can supply atleast that much current right? And what is the frequency I need (it will be controlled with the Arduino with PWM-again, just like in the tut.)
Thanks alot!
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dmaruska over 14 years ago in reply to dirtdiver

All of the Trasistors will work for the PWB that you will be at. The one above has a max frequency of 200Mhz.
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dirtdiver over 14 years ago in reply to dmaruska

so the frequency doesnt metter much in my case?
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dmaruska over 14 years ago in reply to dirtdiver

No, you will be ok.
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dirtdiver over 14 years ago in reply to dmaruska

Ok man thanks alot just one more thing , can I connect not 1 but two motors (parallel) of course I will need a transistor that can support the currnet consumption, but I wont need x2 of the capasitors and the diods
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dmaruska over 14 years ago in reply to dirtdiver

The cap and diode is for noise and transistor protection.
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