900W H-class PA Amp with Limiter

[engel dela pena]

merry christmas bro,
good to see you have 75ac
thumbs up for you bro,
so h900 is a success story why tlo step still no builder post success story and picture,huh

 

[irvynejay]

Thanx i follow what you said and yea it triggers a 75 volts ac in output while feeding 50/100hz on input,, maybe of the Ic ir2117 high speed ,tl0 maybe too slow

 

[NMOS]

Class H is first time for me, have simple question...

Can I use following transformer for APEX Class H Step Driver


Input AC: 230 V

Output 1: SEC 55 - 0 - 55
Output 2: SEC 55 - 0 - 55

Output 3: SEC 15 - 0 - 15


it comes from defectice Ebay Class AB PA amplifier with + / - 140 V Rail

 

[engel dela pena]

irvynejay,
good to hear that,
i feel alive.
but i still don't have ir's,

sir tony,
you mean ''bifilar'' not bifiliar,
Bifilar coil - Wikipedia, the free encyclopedia

 

[irvynejay]

I have also a trapo
OUT1,47 0 47
OUT2,47 0 47

out3 24 0 24

I ask mile about this and he reply it can be used modifying the output in series

94 47 0 47 94 vac

maybe yours also and just use 100 volts or higher caps for PSU


@engel dela pena

Im also trying to figure it out why TL072 wont trigger

But crown amps uses same step drive tl072

 

[TonyTecson]

yup, you can even have your traffo wound quadfilar if the secondary segments are the same....

 

[TonyTecson]

94 47 0 47 94 vac

can be done with quadfilar 47volt secondaries...

 

[engel dela pena]

irvynejay,
say thanks to workhorse and apex for that procedure
see post 940 -945

 

[engel dela pena]

sir tony,
thanks for that,
but i'm afraid its hard to wound that way if wire size is getting bigger,specially secondary

 

[TonyTecson]

that is how i wind all my ss traffos.....

 

[engel dela pena]

tlo step,
based on pulse 2x1100
http://www.crownaudio.com/pdf/legacy/s-c1100as-03.pdf
step schematic on page 5/6
this picture from apex
but i.c pinning is not as in the corrected lay out?
the schematic as in the layout

 

[engel dela pena]

still no builder success of attempting to incoorporate to b500
b500+tlo step is also h900

 

[engel dela pena]

how about coolets pcb w/ two tlo 71?

 

[irvynejay]

H900 WOW!!!

I just installed the TRAPO 40x4 30 amps and the result all i say WOW so VERY LOUD

picture taken feed input 50/100 hz sinewave and measure the output with multi meter the AC reading on output is 110v ac full volume no load

 

[engel dela pena]

nice bro,
almost 110 ac,
dont forget about the ir's he he he,
that is really a happy new year

 

[irvynejay]

yes i will never forget what i promise to you,,APEX say you never go back on AB when you Made Class H,,and its realy true..

na try ko ngayun ang 10 pairs ni e,,,...n bro d ko type sound napakalayu sa b500

 

[asia]

your right bro i still beginning to doubt what other is saying about it
it is better to test and build before believing them

 

[asia]

anyway reserve those 10 pair for adding it to h900

 

[irvynejay]

not good like squarewave sound ,,Apex design are Very good and trusted that work great,,btw i still use those power trans on other h900 of apex


HHAHAHA i Have 20 pairs of it,,i bought 22 pairs of power output i thought is very good and powerful heheheh,,anyway its good experience

 

[asia]

take note upon going more pairs adding more give stress to driver transistor