ucd 25 watts to 1200 watts using 2 mosfets - Page 249

exflaco · 2nd September 2012, 03:50 PM

Quote:

Originally Posted by ionutzxpo

hi exflaco,post the LAY if you have it

Sorry y post complete material, no LAY ask other forum menbers may by somethig......

stewin · 03:55 PM

Quote:

Originally Posted by CPX

>>>which are the best pairs for output fet buffers among the below
2n5551/5401 , 2s/c2655/a1020 ,2s/a1013/c2229 , bc327/337 , bc368/369 , bc546/556 , bd139/140, mje 340/350

The ones with highest gain and current, but personally i would use dedicated drivers like tc4420

tc is difficult for me to find pls among the above which can work mean while. thanks in advance.

exflaco · 2nd September 2012, 03:53 PM

Stewin Bd139 and 140 work very well and to much cheap TC4420 Triell amps replace directly these new amps no more Tc only bds

nigelwright7557 · 2nd September 2012, 04:04 PM

Quote:

Originally Posted by stewin

tc is difficult for me to find pls among the above which can work mean while. thanks in advance.

I get my tc from rs, farnell or future.

I also use BD243/244 pairs for driving high gate capacitance mosfets.

stewin · 2nd September 2012, 04:05 PM

thanks a lot exflaco i will use your schema but will parallel outputs like irf540n 4 pairs / irfp260n 5 pairs . i will post schema , pcb and pictures once i am through.

andrewlebon · 2nd September 2012, 04:07 PM

hi
greetings which OCP is better triell ocp or detex irs2000 please can any one guide me
want to make pcb 3 pair fda90n20 with bjt totem please any feedback is welcome
supply is 80 volts dc+/- load 2 ohms
warm regards
andrew lebon

stewin · 2nd September 2012, 04:09 PM

Quote:

Originally Posted by nigelwright7557

I get my tc from rs, farnell or future.

I also use BD243/244 pairs for driving high gate capacitance mosfets.

thanks microsim

exflaco · 2nd September 2012, 05:36 PM

Stewin could move 2 pairs irfp250 gate resistor 100ohm directly from ir2110 +- 75- 90v

exflaco · 2nd September 2012, 05:47 PM

Andrew OCP Detex same the Crest class D amps ,Lm311 and 555 ,triell ,more simple a npn transistor and 555 two work fine ,a lot similar protecction on class d amps you only parallel 3 X1 ohms 5w resistor paraleel , and adjust the trimp to the desired humbrall protecttion,(sorry my poor english) more efficient + and - v sense ,another way old AB amps like Peavey the shunt sense resistor to gnd series to the speaker,y share schemm soon..

stewin · 2nd September 2012, 07:02 PM

thanks exflaco for your help i have appreciated. thanks guys also

2nd September 2012, 04:07 PM	#2486
andrewlebon diyAudio Member Join Date: Feb 2008	hi greetings which OCP is better triell ocp or detex irs2000 please can any one guide me want to make pcb 3 pair fda90n20 with bjt totem please any feedback is welcome supply is 80 volts dc+/- load 2 ohms warm regards andrew lebon __________________ [image][/image]"It's Better to try and fail than to never know and always wonder"

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2nd September 2012, 03:53 PM	#2483
exflaco diyAudio Member Join Date: Mar 2005 Location: Santa Fe	Stewin Bd139 and 140 work very well and to much cheap TC4420 Triell amps replace directly these new amps no more Tc only bds

2nd September 2012, 04:05 PM	#2485
stewin diyAudio Member Join Date: Jul 2007	thanks a lot exflaco i will use your schema but will parallel outputs like irf540n 4 pairs / irfp260n 5 pairs . i will post schema , pcb and pictures once i am through.

2nd September 2012, 05:47 PM	#2489
exflaco diyAudio Member Join Date: Mar 2005 Location: Santa Fe	Andrew OCP Detex same the Crest class D amps ,Lm311 and 555 ,triell ,more simple a npn transistor and 555 two work fine ,a lot similar protecction on class d amps you only parallel 3 X1 ohms 5w resistor paraleel , and adjust the trimp to the desired humbrall protecttion,(sorry my poor english) more efficient + and - v sense ,another way old AB amps like Peavey the shunt sense resistor to gnd series to the speaker,y share schemm soon..

2nd September 2012, 07:02 PM	#2490
stewin diyAudio Member Join Date: Jul 2007	thanks exflaco for your help i have appreciated. thanks guys also