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Old 23rd October 2018, 11:24 AM   #541
J.M.K is offline J.M.K  France
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Default Heat & capacitors

Quote:
Originally Posted by shaan View Post
Hi JMK.

No need. Fix the board flat on mosfets' face.
My concern was aimed at capacitors life's lasting.
A few degrees less for the pcb wouldn't hurt in my opinion ......

JMK
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Old 23rd October 2018, 01:14 PM   #542
vallickad is offline vallickad  India
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Hi Shaan,
Awaiting your shipment of the pair of kits.
Zacharia.
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Old 25th October 2018, 11:27 PM   #543
gaborbela is offline gaborbela  Canada
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Just finished the PC boards stuffing.
Yes, you right the Acetone made my boards messy. I have to buy some alcohol to clean them nicely.
Do you think 99% rubbing type of alcohol will work? Homebrew type of PC board and factory type like TV had no issue to clean it with acetone.

I choose EXICON power mosfets instead of Hitachi.
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Old 26th October 2018, 09:42 AM   #544
Harry3 is offline Harry3  Australia
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I have used rubbing alcohol and it is OK.

Don't let it run under the electrolytic caps.
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Old 27th October 2018, 01:29 PM   #545
abanico is online now abanico  Spain
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Default 0R1 resistors

Here in EU ,I use Kontact WL to clean everything and cotton sticks for smoking pipes that are very cheap.
My answer these 0R1 5W resistors that are touching the capacitors have to be non inductive ? Have ordered one 605-RWHSE09TQ000R1FS at Mouser to look at,it's very reduced and fit the board . 0,06 uh at 100kz
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Old 27th October 2018, 02:29 PM   #546
shaan is offline shaan  India
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Quote:
Originally Posted by abanico View Post
Here in EU ,I use Kontact WL to clean everything and cotton sticks for smoking pipes that are very cheap.
My answer these 0R1 5W resistors that are touching the capacitors have to be non inductive ? Have ordered one 605-RWHSE09TQ000R1FS at Mouser to look at,it's very reduced and fit the board . 0,06 uh at 100kz
These resistors don't have to be non-inductive thanks to the two zobel networks. If you look closely the zobels are not taken right from output, but from the joint of the two resistors in each side. This was done so that inductive resistors can be used without any problem.
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Old 27th October 2018, 09:54 PM   #547
outtek is offline outtek
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Hi Shaan, is the schematic correct? I am asking because i noticed thar the 2sk 2sj are driven through a resistor, one side with 220 ohms and the other side with 330 ohms. Is that correct? Will the two resistors of 10 ohm supplying the low signal side get hot enough for just 600mW? Granted there shouldnt be much current needed.
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Old 28th October 2018, 04:05 AM   #548
ckwong99 is offline ckwong99  Hong Kong
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I find many designs like this. Seems P-ch and N-ch group with different Vgs and gain charasteristic. So the desiger will use this input resistor balance them.
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Old 29th October 2018, 07:37 PM   #549
shaan is offline shaan  India
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Quote:
Originally Posted by outtek View Post
Hi Shaan, is the schematic correct? I am asking because i noticed thar the 2sk 2sj are driven through a resistor, one side with 220 ohms and the other side with 330 ohms. Is that correct?
Yes those values are correct.

Quote:
Will the two resistors of 10 ohm supplying the low signal side get hot enough for just 600mW? Granted there shouldnt be much current needed.
Even with 250mW resistors we need about 150mA current to burn them. Now, current through input+VAS is around 15mA. So it's fine.

(sorry for late reply )
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Old 30th October 2018, 06:04 AM   #550
vallickad is offline vallickad  India
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Returned the V4 kit you sent instead of V4H, as requested by you, by speedpost
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