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Old 24th February 2013, 03:38 AM   #5781
Salas is offline Salas  Greece
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Read SSLV1.1 builders thread. There is much practical discussion around builds and parameters there.
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Old 24th February 2013, 08:39 AM   #5782
massimo is offline massimo  Italy
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Quote:
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...and what about BC547B instead of BC546B (Vceo 45 vs. 65 and Vcbo 50 vs 80) for Q7 when Vout 35V?
Sorry Salas, the quoted post was a question for you. May I use BC547B?
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Old 24th February 2013, 10:04 AM   #5783
canvas is offline canvas  Taiwan
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Also watch what I wrote for R5, R6.
Yes, I am aware of that. Thanks.
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Old 24th February 2013, 11:18 AM   #5784
Salas is offline Salas  Greece
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Quote:
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Sorry Salas, the quoted post was a question for you. May I use BC547B?
It will be marginal if you will overshoot 35V by 3V when adjusting Vout.
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Old 24th February 2013, 11:33 AM   #5785
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Originally Posted by Salas View Post
Read SSLV1.1 builders thread. There is much practical discussion around builds and parameters there.
Thank you very much .

This Link right.
http://www.diyaudio.com/forums/power...tales-213.html
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Old 24th February 2013, 12:49 PM   #5786
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Yes.
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Old 27th February 2013, 09:17 AM   #5787
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There is the 1.1 bib soon on new gb round that you can use in Mosfet for the 5V and I would recommend the low vgs ST output Mosfet p2p version of the Reflektor for lower Volts as discussed some pages before and made in Japan.
with 2 days before you wrote this post the the guy here Salas Reflektor +3.3V with MTP3055VL: Kon??????? wrote the following ''Replacing STP55NF06L with MTP3055VL, I got great improvement. This result suggests that it is better for the Shunt MOS-FET to be less Cxxx''

should this be taken into consideration?
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Old 27th February 2013, 11:25 AM   #5788
Salas is offline Salas  Greece
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His goal is having lowest forward on voltage and lowest Crss possible for stretching a Mosfet output Reflektor down to 3.3V use. There are 2 things at odds when there. 1. The available voltage left across the mirror. 2. The bumping capacitance curve of Mosfets at low voltage. Those are the reasons I originally suggested him to get testing with the best logic level Mosfet he can in those respects. Nonetheless, from the moment you have it working above 5V and more so 10V up, the STP or the MTP straighten out for Crss much. The STP is a much higher transconductance device in high current but I did not see the Id/Gfs curve in some datasheet when I looked for the MTP to compare at 1A or below. They could be near at low current. In a nutshell he does well to pursuit the lowest capacitance and on thresholds (VgsTh,Vsd) in his application but for higher Vo it may be increasingly irrelevant. The two types are similar in price and available and you can compare in your own app.
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Old 1st March 2013, 06:01 AM   #5789
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where are you buying sk117GR
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Old 1st March 2013, 06:32 AM   #5790
canvas is offline canvas  Taiwan
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Salas,

Can I use STP55NF06L or MTP3055VL over IRF9240 on 1.2R for 3.3v? If yes, is there anything I should take care of?
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