good.please send procedure to check stepper.my ampl.is not working,only ab mode work.thanks
Hi APEX
Where are the 2 Rail Output Filter, cant see the 2 T157 Output Filter ?
your internal not look same like schematic
posted 20th February 2019 in thread #3688
and differs picture Thai Electronic Handbook MAY 2019
do you have hide underneath output Filter ?
Please provide revised TD1800 schematic
hi all , i have finished drawing the schematic 3tier using lm 311
please check all and point out erors if there be any .
i have also uploaded eagle files 😀😀 have fun all and thanking you all in advance for your contributions
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Hi guys,,,sir mile can i use 1n5819 instead of bat85 and mur460 instead of by399 diodes in this td1800?and for everyones benefit can we ask for the test points for this amp for us to test if our work are ok..thank you,..
Regards
Regards
also i have had stability issues with class d amps . with the exception of class d 200wts using tl074 ,
all high voltage class d i made whether sigma delta or ucd discreet or ir2110 versions , failed after long term usage , the worst thing i noticed was when i use more than one channel in one casing. failure is almost instant or two days of usage, issues will eventually arise and failure will happen .
the voltage i mainly used was +/-40volts to +/-85volts . the above observations are mine own experience since 2012
the 200wts class d using tl074 has survived and is a good amp . the minimum and maximum voltages i used were +/-28volts to +/-49volts. i made up to six channels in a casing using two smps power supply and using one smps power supply . and it's stability can be compared to a class ab amplifier.😉
diysmps
Ultra Simple Class D
having a bad experience in all the above about 8 years of mine own carefully practical research , i do not want to use class d amps at high voltages🙁🙁
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simple apex h 3tier 1800 layout loading ..... ......... ........ ..... comments views and suggestions highly appreciated .thanks all😉
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Im confused, there ARE FROM kArTINO cLASS d aMPS CAN DRIVE 4 X 18 easy BS YOU TALK HAVE BAD EXPERIENCE
ucd 25 watts to 1200 watts using 2 mosfets
class d does work but after sometime it will just fail for no good explainable reason
initial test,,,,
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
photos
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look PIC ?
how do you generate 18 V ?
separete PSU or from 140 V VCC / VSS with Resistor and Zener ?
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There is ALWAYS an explainable reason. Most of the time it is because E(on) and E(off) are just too damned high and as soon as you start drawing any real current you run into too much dissipation. If this is properly calculated and accounted for in the thermal design you wouldn’t have a bit of trouble with it. Sometimes your layout and drive waveforms just won’t support fast enough switching to get the turn on/off losses down to 1%. That’s ok, if you can only get it down to 5 or 10%, just have 500 W of dissipation capability for a 5kW amp and it will sit and run fat dumb and happy all day, or at least until your voice coils start to smell. And still run cooler than a class AB or H.
