Simplistic NJFET RIAA

[Salas]

Nice statistical analysis and I am sure Jason the admin knows all that stuff very well.

 

[merlin el mago]

Hi Salas

Look at this: Diyaudio.com

🙂

 

[massimo]

Country traffic: 2nd place China......

 

[merlin el mago]

Country traffic: 2nd place China......

Shortly they will be the first ones.

 

[RCruz]

They allready are the first ones to copy anything they find around. Strangely I do not find many posts from china here 🙂

 

[merlin el mago]

Rare and expensive components for a potential very small market.

 

[noSmoking]

You should have about 4mA running through R10. Whatever voltage in respect to ground that resistor's drop imposes on Q2's drain gets to Q3's source minus little something. Your R9 value should allow double that voltage on its drain. Check those conditions. Trim R9 accordingly if Q3 is healthy. R10 changes the gain, better don't go there first.

Hi Salas,
Thanks I'll see what's there ,it might be tomorrow night before I can get to it,Girls first toys second,lol.
NS

 

[noSmoking]

Hi Salas,
Thanks I'll see what's there ,it might be tomorrow night before I can get to it,Girls first toys second,lol.
NS

Hi Salas,😀
Got it working,I have NEVER had a open resistor right out of the bag, R6,oh well I learned a new trick,When everything else is ok check the source to ground,lol.I usually check the R & C's before I install them,my bad,
The boards sound good,out of 2 shunt PS's and 2 Phono boards ,I caused one mistake but they went together and worked first time,GREAT!!!I was surprised for sure,My cartridge is over 30 years old,still sounds good but a new one is in order,I have found some denons,black,green and blues Have you a favorite? I am looking in mid range area,I have read that the black is the same as a green just didn't make the higher spec,
Thanks alot!😀
NS🙂

 

[RCruz]

denons,black,green and blues .. what do you mean ?

 

[merlin el mago]

Salas how much current draws the 63dBs to calculate the dummy load for PSU?

 

[noSmoking]

Hi Rcruz,

denons,black,green and blues .. what do you mean ?

I looked at too many those are grado cartridges,Have you used them?Look here Phono Cartridges-Audio Advisor at the bottom of the page.
Regards,
NS

 

[Salas]

Salas how much current draws the 63dBs to calculate the dummy load for PSU?

37mA per channel.

 

[Salas]

I looked at too many those are grado cartridges,Have you used them?Look here Phono Cartridges-Audio Advisor at the bottom of the page.
Regards,
NS

What exact gain pre you built? Will tell you about carts.

 

[merlin el mago]

Thanks, what power for 330R that goes in parallel with trimmer 200 ohms, 2W like R13?

 

[noSmoking]

What exact gain pre you built? Will tell you about carts.

I guess that would be helpful,lol.
I built the 43db gain hi mc ,mm,Thanks!
NS

 

[Salas]

I guess that would be helpful,lol.
I built the 43db gain hi mc ,mm,Thanks!
NS

Denon DL-110. You can't go wrong with that cart at that low price.

 

[Salas]

Thanks, what power for 330R that goes in parallel with trimmer 200 ohms, 2W like R13?

When the schema has no power annotation then its 1/4W. You can use 0.5W also.

 

[merlin el mago]

Thanks, also I corrected the schematic Q8 SK170GR 5mA in place of wrong SK170BL.

 

[RCruz]

Denon DL-110. You can't go wrong with that cart at that low price.

Very good choice 🙂

 

[noSmoking]

Denon DL-110. You can't go wrong with that cart at that low price.

Hi Salas,🙂
I have looked at that one too,alot of folks are using it ,so I will get one too,
Thanks for the help and info!😀
Regards,
NS