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NP-100v12 - 12AU7 / IRF510 HeadAmp Support Thread
http://diyaudioprojects.com/Forum/viewtopic.php?f=10&t=1799
Page 26 of 170

Author:  robot797 [ 22 Aug 2010, 08:58 ]
Post subject:  Re: NP-100v12 - 12AU7 / IRF510 HeadAmp Support Thread

were are the irf510 i only see the lm317 or backway

Author:  Mr2D [ 22 Aug 2010, 09:04 ]
Post subject:  Re: NP-100v12 - 12AU7 / IRF510 HeadAmp Support Thread

They are on diferent sides of the board, the IRF 510 are standing on one side whereas the lm317 are bent.

Author:  KrammeAcoustics [ 22 Aug 2010, 09:06 ]
Post subject:  Re: NP-100v12 - 12AU7 / IRF510 HeadAmp Support Thread

Mr2D wrote:
There are no diferences between "red" and "blue", both are 150 ohms coupled with 100uf cap.

I may rebuild this thing but I don't know if the components will survive especially the transistors.

I'm actually using stereo jacks for input / output. How am i supposed to wire them?


Okay ...let's get this thing working then.

I'm still wondering about the resistor values, am i right about the colours blue/green/black of the two resistors in the blue circle ? and brown/green/brown of the one resistor in the red circle ? if it is so im right about the 112 vs 150 ohm ( you'll have to correct them, to the same size for both channels ).

You can use this tabel to check it out.

Image

Author:  Mr2D [ 22 Aug 2010, 09:17 ]
Post subject:  Re: NP-100v12 - 12AU7 / IRF510 HeadAmp Support Thread

In the blue circle, one 100ohms in serie with one 56ohms
The total is 152ohms (checked with the meter)

Author:  KrammeAcoustics [ 22 Aug 2010, 09:26 ]
Post subject:  Re: NP-100v12 - 12AU7 / IRF510 HeadAmp Support Thread

Mr2D wrote:
In the blue circle, one 100ohms in serie with one 56ohms
The total is 152ohms (checked with the meter)

Do you have skype ? maybe we could solve it there.

( use PM for the adress ).

Author:  robot797 [ 22 Aug 2010, 16:11 ]
Post subject:  Re: NP-100v12 - 12AU7 / IRF510 HeadAmp Support Thread

I did it with a irf520 i got 300 watts of power it is my black rìg see a few pages bevore

Author:  zanky [ 24 Aug 2010, 12:44 ]
Post subject:  Re: NP-100v12 - 12AU7 / IRF510 HeadAmp Support Thread

Hi
I'm a newbie in the forum and I came from italy ( sorry for my bad english :blush: ). This project impressed me so much and I deciced to bild it.
I bought all the components but I found only "buz72" instead of "irf510". The seller told me it works the same but I'm not sure :? . someone can tell me something about this mosfet?
thank you very much

Author:  Gio [ 26 Aug 2010, 12:42 ]
Post subject:  IRF510 MOSFET Replacement / Alternative

Hi Zanky, welcome to the forum.

The following are listed as replacements / alternates for the IRF510: BUZ 20, BUZ 72, 2SK628, 2SK917, 2SK920

So you should be ok with the BUZ72. Let us know how you make out.
Cheers

Author:  zanky [ 26 Aug 2010, 16:58 ]
Post subject:  Re: NP-100v12 - 12AU7 / IRF510 HeadAmp Support Thread

Hi
I finished assembling the amp this morning. The sound is really nice: much "bass" and the "high" are very pure. Now I'm using a 12v 7Ah battery but I assembled the circuit for the AC power supply. I didn't use the lm317 circuit but a normal 7812 with a diode in series on the GND terminal. The output is 12,63 volt under load and I think it's ok. I don't heard any kind of noise.
a stupid question... for increase a little the gain of the amp ?
thank agains and sorry for my bad english.

Author:  solo [ 01 Sep 2010, 10:00 ]
Post subject:  Re: NP-100v12 - 12AU7 / IRF510 HeadAmp Support Thread

Hi,I can not find out the volume pot 10k in my area, so can i use the 50k volume pot ?
any one help,i apprecieate that

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