ca339e comparitor as phaze shift????

psychosteve · 29th December 2004, 04:20 PM

Does anyone know the CA339E quad volage comparitor be used for a phaze shifter to bridge a pair of power amps???

has anyone tried using this chip before, i know its a military chip and has great temp specs, just not a lot of other info.

Help is grately received, see you all later, steve.. ..

Steven · 29th December 2004, 05:28 PM

Hi Steve,

I assume that the CA339 is equal to the LM339 comparator, just a different brand.
The 339 is a quad comparator, not a quad opamp. That means it has no frequency compensation and only an open collector output. Even with a pull up resistor from the output to the positive power supply, it would result in a bad opamp, still no frequency compensation and not designed for linearity, only for gain. The input stage is similar to the LM324 quad opamp and that one is a very bad audio performer.
So forget the mil-spec temperature range (btw I thought it was the 139 version that has the better temp spec) and select a real audio opamp for your application, or a discrete solution.

Steven

xplod1236 · 29th December 2004, 06:03 PM

Try the drv134 from TI.

darkfenriz · 30th December 2004, 12:13 AM

why not use 'normal' , linear opamp?
do you make an amp for the army?

regards

psychosteve · 30th December 2004, 10:33 AM

ah well, just a thought..

im not making an amp for the army, im a specialist engineer and i got my hands on 50 of these chips. so since they where free i thought what can i do with them!!!

and as ive still got them, any ideas??? apart from sell them and buy something else..

cheers for the help guys, see you later, steve.. ..

darkfenriz · 30th December 2004, 11:42 AM

hm.. a comparator?

kind of current protection...

class D...

not many applications in audio I guess

cheers

29th December 2004, 04:20 PM	#1
psychosteve diyAudio Member Join Date: Sep 2004 Location: coventry england	ca339e comparitor as phaze shift???? Does anyone know the CA339E quad volage comparitor be used for a phaze shifter to bridge a pair of power amps??? has anyone tried using this chip before, i know its a military chip and has great temp specs, just not a lot of other info. Help is grately received, see you all later, steve.. .. __________________ you all laugh because im different, i laugh because youre all the same.. ..

29th December 2004, 05:28 PM	#2
Steven diyAudio Member Join Date: Oct 2003 Location: The Netherlands	Hi Steve, I assume that the CA339 is equal to the LM339 comparator, just a different brand. The 339 is a quad comparator, not a quad opamp. That means it has no frequency compensation and only an open collector output. Even with a pull up resistor from the output to the positive power supply, it would result in a bad opamp, still no frequency compensation and not designed for linearity, only for gain. The input stage is similar to the LM324 quad opamp and that one is a very bad audio performer. So forget the mil-spec temperature range (btw I thought it was the 139 version that has the better temp spec) and select a real audio opamp for your application, or a discrete solution. Steven __________________ The Analog Art shows no sign of yielding to the Dodo's fate. The emergence and maturation of monolithic processing finesse has perhaps lagged a bit behind the growth of the Binary Business. But whereas digital precision is forever bounded by bits, there is no limit excepting Universal Hiss to the ultimate accuracy and functional variety of simple analog circuits. - Barry Gilbert, 1973

30th December 2004, 10:33 AM	#5
psychosteve diyAudio Member Join Date: Sep 2004 Location: coventry england	ah well, just a thought.. im not making an amp for the army, im a specialist engineer and i got my hands on 50 of these chips. so since they where free i thought what can i do with them!!! and as ive still got them, any ideas??? apart from sell them and buy something else.. cheers for the help guys, see you later, steve.. .. __________________ you all laugh because im different, i laugh because youre all the same.. ..

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29th December 2004, 06:03 PM	#3
xplod1236 diyAudio Member Join Date: Dec 2003 Location: On the couch	Try the drv134 from TI.

30th December 2004, 12:13 AM	#4
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	why not use 'normal' , linear opamp? do you make an amp for the army? regards

30th December 2004, 11:42 AM	#6
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	hm.. a comparator? kind of current protection... class D... not many applications in audio I guess cheers

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