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Old 4th January 2019, 10:00 AM   #661
shaan is offline shaan  India
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There is a mistype in the post:

Quote:
Originally Posted by shaan View Post
...Small drain-source capacitors added to each MOSFET to shunt the inherent and variable drain-source capacitance. This eliminates all output stage parasitic oscillation due to MOSFET mismatch/interaction.
I meant to say Drain to Gate capacitance, not drain to source.

Thanks to supernet for pointing it out.
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Old 4th January 2019, 01:28 PM   #662
ckwong99 is offline ckwong99  Hong Kong
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Yes your post 644 step 5 already said drain to gate .
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Old 9th January 2019, 04:51 AM   #663
asuslover is offline asuslover  Romania
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For EXICON mosfets is the mod necessary? I did not understand from your post 648.
Plz edit the schematic , thanks
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Old 9th January 2019, 05:08 PM   #664
steefdebruijn is offline steefdebruijn  Netherlands
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Hi,

I am pondering about using these together with the V4 boards for an LX521 system (3xV4 and 2xV4H). It is required however that the amps used for this system all have the same voltage gain.

Is there a way to tune the V4 or the V4H in such a way that both have the same voltage gain? Reading the specs from posts 1 the gains are close but not the same.

Steef
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Old 11th January 2019, 05:52 AM   #665
drgnanam is offline drgnanam  India
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Hi,
If you are using DSP then gain difference can be easily adjusted in DSP setting,if iam right there 1db gain difference between v4 and v4h
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Old 11th January 2019, 11:52 AM   #666
steefdebruijn is offline steefdebruijn  Netherlands
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Hi

I was thinking about the ASP.4 from Hairballaudio so I need an analog solution.

Should a voltage divider with ratio 0.891251 do the job on the V4H inputs or the low channel output of the ASP.4? (Calculated from sengpielaudio.com/calculator-gainloss.htm); actually, if the voltage gains mentioned in the start posts are correct there actually is a reduced gain on the V4H of -0.548765 dB instead of -1 dB, so the divider should target a ratio of 0.938776.

Any resistor values I should aim for?

Steef
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Old 11th January 2019, 12:41 PM   #667
drgnanam is offline drgnanam  India
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if you are planning for ASP and if have not build the amp modules best is to use V4h for all channels, for subs use +/-56V and+/- 45 V for rest of the modules and not worry about gain ( V4H MEASURES BETTER THAN V4)
if you need to adjust gain next best option is adjusting it in amp rather in ASP as small changes in gain structure in ASP( relative ) will have more effect in amp output voltages and if for some reason if you are upgrading amplifier in future you don't have to tinker ASP again
and it's better to reduce in V4H rather than increase V4 as our sensitivity of hearing in low frequency much less than in 1-5k ( much more forgiving)
shaan will be best person to advice on reducing gain

Last edited by drgnanam; 11th January 2019 at 12:51 PM.
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Old 11th January 2019, 12:55 PM   #668
steefdebruijn is offline steefdebruijn  Netherlands
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Thanks why did I not think of just build 10 V4H modules :-)

Steef
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Old 11th January 2019, 03:44 PM   #669
gtose is offline gtose  United States
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Default Silver mica rev 1

FWIW, I just completed my V4H rev 1 mod using silver mica caps. Everything fits as expected, but I have just a few tips on using the larger mica caps.

1) The mica caps - at least the CDE ones I'm using - have the leads flush with one side of the cap, not always the side with or without the text markings. I placed the flush side down to help keep things stable and low profile, especially on the rear mounted caps.
2) Be careful with the placement of the mod caps for Q13, Q14. These mosfets have C11 and C12 within their footprint on the top layer, so you'll have to mount the mod cap offset to clear those caps.
3) If you haven't finished the board yet and looking to do the mod, I would recommend mounting the mod caps before you put the higher profile parts in place - electrolytics, 5w resistors, etc - this will make poking around in there with a hot iron much easier.

I think I've finally gotten everything soldered for my build, can't wait to start wiring it up and try out the V4H!

Greg
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Old 11th January 2019, 07:34 PM   #670
Harry3 is offline Harry3  Australia
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Greg
Thanks for the photos. It makes assembly easier
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