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Oscillator using ad829 works - trying to make it work using 741

by FOIWATER
Tags: ad829, oscillator, work
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FOIWATER
#37
Feb14-14, 09:28 AM
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I need a high input to turn on the mosfet. This seems like a different scenario, no?

I guess.. a high signal IS technically turning on the mosfet.. but it's a low signal from the driver which accomplishes it?
Jony130
#38
Feb14-14, 09:44 AM
P: 406
This circuit will do the job
Attached Thumbnails
3.PNG  
FOIWATER
#39
Feb14-14, 09:45 AM
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I wouldn't feel right using it outright. But I will try my best to learn from it. Thanks, Jony

Do these circuits eliminate the need for a driver??

I am lost here
Jony130
#40
Feb14-14, 09:52 AM
P: 406
Of course R1 represent the load resistance. And this circuit work exactly the same as this one
http://www.avrfreaks.net/index.php?n...128299&start=0
The only difference is that the input is a emitter, and thanks to this high input will turn on the mosfet.
FOIWATER
#41
Feb14-14, 12:06 PM
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How about if I use a separate supply for the driver and ground the source of the MOSFET.

If this will work, will 5 volts be enough?
Jony130
#42
Feb15-14, 09:46 AM
P: 406
You want to use a floating power supply for a MOSFET ?
FOIWATER
#43
Feb15-14, 11:15 AM
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for the driver, will that work?
Jony130
#44
Feb16-14, 04:32 AM
P: 406
If you don't want to use this discrete MOSFET driver. I think you should try to use IR2011. You can power it from 12V power supply you already have in your design.
FOIWATER
#45
Feb16-14, 07:22 PM
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Really.. but as you said, 12 volts to the gate of the MOSFET will not allow me to have 28 volts at the source?

I will have 12 - Vgs only, no?

I don't think I understand drivers
Jony130
#46
Feb17-14, 08:15 AM
P: 406
But IR2011 has high side driver with external diode and capacitor. And this will boost the gate voltage up to
28V + 12V.
FOIWATER
#47
Feb17-14, 02:45 PM
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I did not know this thanks Jony


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