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Old 19th February 2010, 12:34 PM   #3071
maxpou is offline maxpou  Canada
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Hi Salas,
thank you for your schematic it's very appreciated. I have some questions for you.
1- What is the color of LEDs used in the PS?
2- It's very necessery to match Q1 and Q7?

thank you! Maxpou
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Old 19th February 2010, 01:40 PM   #3072
Salas is online now Salas  Greece
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1. Greens will do OK.
2. Not exact match necessary, but keep em the closest you can.
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Old 19th February 2010, 02:33 PM   #3073
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Salas,
Have you a good high voltage regulator to use for this project ?

http://www.diyaudio.com/forums/group...ml#post2090930
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Old 19th February 2010, 03:10 PM   #3074
Salas is online now Salas  Greece
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I have the simpler simplistic. Has its own thread in power supplies. I see from the photos in your link, its already there.
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Old 19th February 2010, 03:11 PM   #3075
massimo is offline massimo  Italy
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Simplistic Mosfet HV Shunt Regs
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Old 21st February 2010, 03:27 AM   #3076
maxpou is offline maxpou  Canada
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Thank you Salas,
I will give you news as soon as possible. Maxpou
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Old 8th March 2010, 10:13 PM   #3077
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Snowing all day, internet has gone till now, AC electricity going off, going on every half hour, all living in Europe

One channel LED's lit & voltage between GND & Q3 (BC550C) ok with 7.2V

The other channel LED's lit but voltage between GND & Q3 (BC550C) is 7.86V?

Can I use the NJFET RIAA or I have to wait until get 7-7.3V?
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Old 8th March 2010, 10:37 PM   #3078
Salas is online now Salas  Greece
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You can. Still near. Just find 1-2 LED that are low to exchange and drop down the happier side, in the next days. For to have excellent first stage voltage match.
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Old 8th March 2010, 10:44 PM   #3079
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It's really strange, I have matched the LED's in both channels with the same voltage across: 7.25V?
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Old 8th March 2010, 10:46 PM   #3080
Salas is online now Salas  Greece
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Yes but the two Jfet CCS for LEDs may be producing different currents or the LEDs behave differently at this current level. In the end, when everything works OK, I will guide you on how to match the output levels for both channels by using a test record and your DVM. That is what really matters. Is it playing music yet?
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