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  1. Replies
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    hi all crew , i saw apex td/hd 1800 and wanted to...

    hi all crew , i saw apex td/hd 1800 and wanted to go the td/hd way, until the output graph measures were posted :ambivalence:::SD
    i remembered stability issues i faced with hi voltage class d amps...
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    use this schematic below by jlester 7091

    use this schematic below by jlester

    7091
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    Sticky: very lovely and nice layout , after assembling it...

    very lovely and nice layout , after assembling it please post pictures and results.
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    Sticky: hi silvio thanks for the reply ,very useful info...

    hi silvio thanks for the reply ,very useful info and thanks for sharing your experience . even though i still have phobia of using ir ic as gdt,i will revisit it.
    but i have to have many ir2110 as...
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    Sticky: hi andrew !

    hi andrew !
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    Sticky: i have used gdt with very good success , always...

    i have used gdt with very good success , always used small e:e cores , moved away from using ir2110 because when smps output failed the ir2110 always burnt and are expensive to replace . but thats my...
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    Sticky: i have used gdt with very good success , always...

    i have used gdt with very good success , always used small e:e cores , moved away from using ir2110 because of failure, ir2110 always burnt and are expensive to replace . but thats my experience
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    sorry i was away busy with errands but now i can...

    sorry i was away busy with errands but now i can spare sometime. by the way which topic did you raise the question sir?
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    anyone who has tested this version?

    anyone who has tested this version?
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    hi norazmi welcome back , long time no see

    hi norazmi welcome back , long time no see
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    Sticky: :cool:wating ........

    :cool:wating ........
  12. Thread: Smps-1200/2500

    by stewin
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    very quiet here any progress??

    very quiet here any progress??
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    hi rookiex thanks for your reply , but the...

    hi rookiex thanks for your reply , but the component count is too many and the board is too big . better perfecting class d.
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    :) hi all i have settled on discreet mosfet...

    :) hi all i have settled on discreet mosfet driver using mmbt 3904&4403 as gdt, and three pairs output bjt.
    on the two tier version. the three tier one i will use lm 311 . :afro:my choices are...
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    hi andrew . thanks for your quick reply , do you...

    hi andrew . thanks for your quick reply , do you have the pcb files and schematic of the 3600 amp .

    also where can i get the heat sinks at a good price??
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    2 tier based on waso step up and apex vas input ....

    2 tier based on waso step up and apex vas input . please check for errors.

    three tier based on the above tech loading...............
    after i finish with the above two tier :o6463646464656466
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    hi ,pichou nice project . please post photos of...

    hi ,pichou nice project . please post photos of your smps while testing it.
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    any pictures??

    any pictures??
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    thanks ravs . have you build a 3tier class h...

    thanks ravs . have you build a 3tier class h succesfully??
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    class d in my experience is very unstable with...

    class d in my experience is very unstable with high voltage e.g ucd etjale , sigma all detex irs etc , discreet ucd.
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    hi all still continuing with the 2step and 3step...

    hi all still continuing with the 2step and 3step h pcb ab/h

    the class d 200wt using n and p fets is very stable reliable and silent the only downfall is the voltage has to be up to +/-42vlts max...
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    thanks silivio ,have you ever ordered anything...

    thanks silivio ,have you ever ordered anything from ali ?
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    thanks ravpeet for reply. i would like to use...

    thanks ravpeet for reply. i would like to use ir2117 because it is the best in h switching but its price and availability is the issue .

    please post lm311 three steps scheme and not llike qsc...
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    transistor version of step fully discreet . but...

    transistor version of step fully discreet . but it is 2step and not three step i havent found the 3step transistor schematic.

    http://www.diysmps.com/forums/showthread.php?
    ...
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    class h 3 tier 2ohms stable

    hi all i am starting this thread because i want a simple powerfull,stable,silent, effecient i.e low heat amp like td class amplifier.
    apex class h has been a real inspiration .

    ...
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