Masterpiece

[merlin el mago]

Thanks guys.

 

[Stefanoo]

Yes, no ground connected. But most arms are wired in such a way that you can just connect
the Coaxial cable. It does not matter if that in RCA or XLR.

oh yeah I see what you are saying.

Update, I am a little layout with the layout, I have done cleaning this week (on the layout) , mostly silkscreen and some corners for acid traps and now it should be ready to be sent out for manufacturing.

 

[Joachim Gerhard]

cool

 

[merlin el mago]

Hey guys attached pic before to fire up

 

[RCruz]

Nice job

 

[Joachim Gerhard]

looks good, have fun.

 

[merlin el mago]

Thanks guys, unforunately can't enjoy I only hear noise, I guess I connected well the transistors: upper side both BC140-16 & down side BC160-16?

 

[Joachim Gerhard]

Can you post the schematic you build ?
My prototype works, jut heard it yesterday.

 

[merlin el mago]

Attached schematic used

 

[Joachim Gerhard]

What do you use as PSU ?
Batteries ?
You have to decouple the PSU with electrolytics, say 1000uF on each line.

 

[Joachim Gerhard]

How is your tonearm wired ?

 

[Joachim Gerhard]

Only the cartridge should be connected to the + and - input.
When you connect earth to the - input your short the amp.
For example some Rega turntables have the cartridge - connected to the shield, that wiring does not work with this circuit.
Shield should only be connected to earth but not to the - input.

 

[merlin el mago]

What do you use as PSU ?
Batteries ?
You have to decouple the PSU with electrolytics, say 1000uF on each line.

LM317 and LM337
Are necessary the 1000uF on each line?

 

[merlin el mago]

How is your tonearm wired ?

I don't know is Linn Ekos, I guess like the cart left & gnd left to left RCA and right & with gnd right to right RCA.

 

[merlin el mago]

Only the cartridge should be connected to the + and - input.
When you connect earth to the - input your short the amp.
For example some Rega turntables have the cartridge - connected to the shield, that wiring does not work with this circuit.
Shield should only be connected to earth but not to the - input.

I connect the cart to + and - inputs both channels.
Gnd TT is connected to chassis and after connected to gnd circuit.

 

[sq225917]

Only the Earth wire from a LINN/tonearm/cartridge combo goes to gnd, everything else is floating as you'd expect.

 

[merlin el mago]

Checked all transistors and are OK

 

[merlin el mago]

My mistake I connected the bases between both BC140 & both BC160 in place of BC140 with BC160, time to fire up again

 

[merlin el mago]

Still no sound only noise

 

[Joachim Gerhard]

Can you make a simple drawing how you miss connected ?
Even when the LMs are a bit noisy it should amplify.