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Simplistic NJFET RIAA
Simplistic NJFET RIAA
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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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Simplistic NJFET RIAA
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
audiodesign is offline audiodesign  Italy
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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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Simplistic NJFET RIAA
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 online now 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
merlin el mago is offline merlin el mago
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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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Simplistic NJFET RIAA
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
merlin el mago is offline merlin el mago
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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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Simplistic NJFET RIAA
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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