what's the intended passband of the amp?
1uF and 22uF could be too big for a treble only amp.
both could be good polypropylene foil, if you get the values right.
1uF and 22uF could be too big for a treble only amp.
both could be good polypropylene foil, if you get the values right.
Ok thanks for the clue actually my -6dB for my LR4 xover is 2.3Khz
If i set the F3 at 1.5 octave (please correct me if am wrong) would give 2.738nF and 58.245nF instead of 1uF and 22uF. The best i can get here is millar caps.
If i set the F3 at 1.5 octave (please correct me if am wrong) would give 2.738nF and 58.245nF instead of 1uF and 22uF. The best i can get here is millar caps.
I would set the input filter ~ 10times lower than 2.3kHz.
i.e. RC=0.69mS, for Zin =10k C=69nF. Use 68nF or 82nF or 100nF.
Set the NFB just over half an octave below whatever you choose. ie for 100nF (RC=1mS) then NFB RC~=1.5mS. for 470R, use 3u3F, to match 68nF use 2u2F.
All of these values fall into affordable film Polypropylene and the smaller can certainly be foil PP. I wonder if 68nF Teflon would be worth experimenting with?
i.e. RC=0.69mS, for Zin =10k C=69nF. Use 68nF or 82nF or 100nF.
Set the NFB just over half an octave below whatever you choose. ie for 100nF (RC=1mS) then NFB RC~=1.5mS. for 470R, use 3u3F, to match 68nF use 2u2F.
All of these values fall into affordable film Polypropylene and the smaller can certainly be foil PP. I wonder if 68nF Teflon would be worth experimenting with?
Re: Is my board good???????????
make the conductor paths for V+ and V- c to the chip pins 1, 4, 5 etc. thicker ... it looks very thin for me ... for reference take a look on the pcb of jaycee above ...
regards
artQuake
zeus_threat said:
make the conductor paths for V+ and V- c to the chip pins 1, 4, 5 etc. thicker ... it looks very thin for me ... for reference take a look on the pcb of jaycee above ...
regards
artQuake
thanks for the replies
Hi thank you for your replies. I'll change the caps to what you mentionned andrew and increase the thickness of power lines. At this point i am thinking of cuting down the caps to 220uF instead of 2200. The supply is made of 4x4700uF to supply the tweeter amp and the woofer amp.
Hi thank you for your replies. I'll change the caps to what you mentionned andrew and increase the thickness of power lines. At this point i am thinking of cuting down the caps to 220uF instead of 2200. The supply is made of 4x4700uF to supply the tweeter amp and the woofer amp.
Hi,
a dedicated treble driving amp with an F-3db set to 230Hz does not require a conventional high capacitance PSU.
Peter Daniel reports excellent mid band performance from local small capacitance on his implementation.
Read his threads and decide whether local electrolytics only are for you, somewhere between 220uF and 1500uF.
I would expect a separate PSU for the treble amp to perform better than a shared PSU supplying both bass/mid and treble amplifiers.
a dedicated treble driving amp with an F-3db set to 230Hz does not require a conventional high capacitance PSU.
Peter Daniel reports excellent mid band performance from local small capacitance on his implementation.
Read his threads and decide whether local electrolytics only are for you, somewhere between 220uF and 1500uF.
I would expect a separate PSU for the treble amp to perform better than a shared PSU supplying both bass/mid and treble amplifiers.
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