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MOSFET Amplifier IRFP240/IRFP9240
MOSFET Amplifier IRFP240/IRFP9240
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Old 26th November 2020, 06:33 AM   #1361
jacques antoine is online now jacques antoine  France
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MOSFET Amplifier IRFP240/IRFP9240
Quote:
Originally Posted by steveu View Post
Attached is a comparison of a few common constant current circuits. If the bjt circuits have a constant bias source, then the first two bjt are the best and reach the regulation current with only a couple volts, but we are concerned about supply ramp-up where the bias is also ramping up.
The Jfet circuits do not require any bias current and perform well, the two JFET circuit being a bit more flat but more complicated. I would go with the single Jfet circuit.
The LED circuit is just poor.
Hi Steveu,

My diy Elliott P3A has a LED CCS .
Thanks for the CCS data: the coming lockdown weekend is now planned !
Cheers,

Jacques
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Old 27th November 2020, 08:30 PM   #1362
apexaudio is offline apexaudio  Serbia
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MOS200B
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