Hi DC Sound,
FSW will increase when you increase resistor value and the stability will be less.It should be 270R ~ 680R max.
Regards
MANOJ
FSW will increase when you increase resistor value and the stability will be less.It should be 270R ~ 680R max.
Regards
MANOJ
DC,
In an attempt to cure the overheating of zobel resistor the first time I power ApexD200.2 (original one). I installed a 5k trimmer for the freq oscillator, I had it set step by step (I think I managed to reach 3k). There was no noticeable temp changes on the zobel resistor and to some key components like fets, inductor fet driver etc. I do however found out that I had mistakeny placed a 473 value for the output cap, and when I changed it back to 474 and presto! Problem solved!
With Manoj changes I haven't done that yet, I'm not really so sure if changing the Fsw will make noticeable changes with the heating problem. I have yet to revert back to 474 cap and test the amp again.
Regards!
BTW Had you manage to test Manoj mod? The changes is a more recent approach using IR2110 (15v zener diode as internal clamp for VB & VS pin)
I'm also working on a new lay-out to cancel EMI problem (hopefully) on half filter butterworth (LPF) when using ferrite inductor.
In an attempt to cure the overheating of zobel resistor the first time I power ApexD200.2 (original one). I installed a 5k trimmer for the freq oscillator, I had it set step by step (I think I managed to reach 3k). There was no noticeable temp changes on the zobel resistor and to some key components like fets, inductor fet driver etc. I do however found out that I had mistakeny placed a 473 value for the output cap, and when I changed it back to 474 and presto! Problem solved!
With Manoj changes I haven't done that yet, I'm not really so sure if changing the Fsw will make noticeable changes with the heating problem. I have yet to revert back to 474 cap and test the amp again.
Regards!
BTW Had you manage to test Manoj mod? The changes is a more recent approach using IR2110 (15v zener diode as internal clamp for VB & VS pin)
I'm also working on a new lay-out to cancel EMI problem (hopefully) on half filter butterworth (LPF) when using ferrite inductor.
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I try this green ferrite toroid from roks
On my Apex D200 and works without problem.
No overheating of output mosfet and zobel network
I put 2mm gap and wind 18 turns of #18awg magnet wire
On my Apex D200 and works without problem.
No overheating of output mosfet and zobel network
I put 2mm gap and wind 18 turns of #18awg magnet wire
"Roks" is a local e-parts store. The green toroid is hard to identify since it comes as surplus component.
@remle114,
how did you manage to make the cut? I had the same toroid tried to make a cut also, i used a saw file and a steel saw but It won't get through with the cut the result was a terrible scratch in the surface
@remle114,
how did you manage to make the cut? I had the same toroid tried to make a cut also, i used a saw file and a steel saw but It won't get through with the cut the result was a terrible scratch in the surface
"Roks" is a local e-parts store. The green toroid is hard to identify since it comes as surplus component.
@remle114,
how did you manage to make the cut? I had the same toroid tried to make a cut also, i used a saw file and a steel saw but It won't get through with the cut the result was a terrible scratch in the surface
Hi Abetir this is the tool i used to cut those toroid
This is a Die grinder or rotary tool, very usefull for drilling PCB for cutting square hole in amplifier chasis
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Protection circuit use 0,05R with IGBT start at 25A (4000VA), use 0,1R with MOSFETs.
What about changing R10 to 2k for FETs and keep 0.05R for power dissipation reasons?
