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Old 6th February 2018, 05:49 AM   #121
ckwong99 is offline ckwong99  Hong Kong
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Hi Shann,
Can i take additional 3 pairs of V4H boards with 2 set of FET.
Pls PM to me , if you still have them, thx
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Old 6th February 2018, 08:48 PM   #122
shaan is offline shaan  India
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Quote:
Originally Posted by kpsthakur View Post
Hi Shaan, I see the BOM values for transistors are in B classification, to what range are we expecting HFE's to be and how close do they need to be matched.


Also how bad it would be if we don't use matched transistors. If I buy in 100's, not sure what will I do for with the rest of the transistors
Hi Kamal.

The B class ones have HFE between 250-350. Matching within 50 units is good enough, e.g. NPN 280 and PNP 330.

Matching matters only for Q1,2 and Q9,10 to some extent. All my measurements and listenings are with only Q1,2 matched. No need to buy 100s. Get double of what's needed and sort out the closest matched ones and we're good.
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Old 6th February 2018, 08:49 PM   #123
shaan is offline shaan  India
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Quote:
Originally Posted by ckwong99 View Post
Hi Shann,
Can i take additional 3 pairs of V4H boards with 2 set of FET.
Pls PM to me , if you still have them, thx
You got PM.
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Old 7th February 2018, 02:25 AM   #124
kpsthakur is offline kpsthakur  India
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Quote:
Originally Posted by shaan View Post
Hi Kamal.



The B class ones have HFE between 250-350. Matching within 50 units is good enough, e.g. NPN 280 and PNP 330.



Matching matters only for Q1,2 and Q9,10 to some extent. All my measurements and listenings are with only Q1,2 matched. No need to buy 100s. Get double of what's needed and sort out the closest matched ones and we're good.


Thanks Shaan, in that case I think I am covered with what I have at hand
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Old 7th February 2018, 03:14 AM   #125
ckwong99 is offline ckwong99  Hong Kong
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Hi Shaan, Just settled the payment, pleas check
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Old 7th February 2018, 06:02 AM   #126
shaan is offline shaan  India
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Quote:
Originally Posted by kpsthakur View Post
Thanks Shaan, in that case I think I am covered with what I have at hand


Quote:
Originally Posted by ckwong99 View Post
Hi Shaan, Just settled the payment, pleas check
Received. Thank you.
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Old 7th February 2018, 02:04 PM   #127
shaan is offline shaan  India
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One step closer to PeeCeeBee PSU with integrated speaker protection.

While waiting for the V4H boards I have finished the design and ordered prototypes for final tests. Expecting them to arrive by 20th.
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Old 7th February 2018, 03:03 PM   #128
ckwong99 is offline ckwong99  Hong Kong
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PSU is CRC type ? What relay you selected?
Your V4 version 1 is very stable with single pair of mosfet. So your final UAT on V4H is much valuable. Wish you succeed
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Old 7th February 2018, 03:12 PM   #129
shaan is offline shaan  India
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Yes it is CRC type. In the prototypes I only installed one footprint of the small 10A relays. In the final layout I'll try to add at least one more footprint for bigger relays with standard pinouts.

Thanks.
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Old 7th February 2018, 03:46 PM   #130
ckwong99 is offline ckwong99  Hong Kong
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Keep on Shaan , good night
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