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Old 8th May 2019, 09:32 AM   #801
bambadoo is offline bambadoo  Norway
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Hmm - have a couple of smps +-45Vdc laying around. Will try them. Still waiting for parts so I can start soldering.


Not sure if it has been said before. What is the PSRR of the V4H modules?

Sincerely

Last edited by bambadoo; 8th May 2019 at 09:46 AM.
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Old 8th May 2019, 02:32 PM   #802
shaan is offline shaan  India
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PSRR hasn't been measured for v4/v4h. However as I can't hear any hum with only 10000uF in the rails I guess PSRR is high enough for a dark background.
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Old 19th May 2019, 06:07 PM   #803
delange is offline delange  Belgium
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Hi Shaan,

Happy to report that I received my PCB's last week.
A question in regards to the heatsink requirements: do you think an SK 85 75 SA heatsink is sufficient for one channel?
This heatsink has a thermal resistance of 0,45 K/W.
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Old 19th May 2019, 07:51 PM   #804
bambadoo is offline bambadoo  Norway
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After a year waiting. About to start.
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Old 19th May 2019, 09:02 PM   #805
Cresnet is offline Cresnet  Jordan
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Quote:
Originally Posted by bambadoo View Post
After a year waiting. About to start.





Nice PCBs!
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Old 20th May 2019, 06:52 AM   #806
bambadoo is offline bambadoo  Norway
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Yes, have complete parts for 4 channels. But only need 2
Would it be any benefits if making it complete balanced or should I just make 2 amps?

Thinking.....
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Old 24th May 2019, 06:04 AM   #807
bambadoo is offline bambadoo  Norway
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Quick question:
After the setup procedure has been done. When closing J1 and J2 , what is the purpose of Q5 and Q6?

Do they affect the SQ at all?

And: Since I have some 2sc2240bl and 2sa970bl laying (good matched) - would these yield any benefit instead of bc546/bc556 in the different locations?
Of course I have to change the pin layout of these

For VAS transistors. Can I use ksc2690ays/ksa1220ays? Have some of those also...

Sincerely
M

Last edited by bambadoo; 24th May 2019 at 06:24 AM.
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Old 24th May 2019, 07:40 AM   #808
shaan is offline shaan  India
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Quote:
Originally Posted by bambadoo View Post
Quick question:
After the setup procedure has been done. When closing J1 and J2 , what is the purpose of Q5 and Q6?

Do they affect the SQ at all?
Closing the jumpers shorts base and emitter of these bjts, turning them fully off. There is no impact on SQ.

Quote:
And: Since I have some 2sc2240bl and 2sa970bl laying (good matched) - would these yield any benefit instead of bc546/bc556 in the different locations?
Of course I have to change the pin layout of these
Yes these can be used. But might look odd on board.

Quote:
For VAS transistors. Can I use ksc2690ays/ksa1220ays? Have some of those also...
No these can't be used safely. Each vas transistor will face nearly double the rail voltage i.e. approx 112V with 56V supplies at clipping, which is too close to their 120V rating.
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Old 24th May 2019, 08:05 AM   #809
bambadoo is offline bambadoo  Norway
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Thanks for quick response. Agree with you comments.
I am aiming for +-45V on 2 of the boards. That was were I was thinking of the ksc2690/ksa1220. On the other 2 board (Potential higher rail voltages) IŽll search my drawers to find something more useful
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Old 24th May 2019, 08:33 AM   #810
shaan is offline shaan  India
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I think 45V won't be much problem for them. Total collector to emitter voltage at clipping will be 30V less than their rating. So for the two boards I think they will work fine.
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