MPP

[Joachim Gerhard]

Jacco thanks, you have hidden qualities.

patriz, yes this potmeter is linear. I use Alps blue with middle dent.
Marcin even made a PCB. You can send him a PM if you want information.

 

[RCruz]

Almost finished stuffing the second board Just waiting for some micas for the power transistors.

Now I am in trouble with the riaa caps... my sourcing went wrong and bought amtrans caps from hificollective... too much variation... need to use big caps I have in stock (REL-CAP 15n) so I will use an external riaa after all.

To connect the external riaa, is it sufficient to connect it to the indicated place in the board or do I need to do some shunts ?

 

[FdW]

http://www.diyaudio.com/forums/analogue-source/154210-mpp-115.html#post2982127

Hoplahop ?

Jacco (I am confused/puzzled) why re-posting these links? Hoplahophop

 

[jacco vermeulen]

154210-mpp-574.html#post2982127 is not 154210-mpp-115.html#post2982127

 

[FdW]

154210-mpp-574.html#post2982127 is not 154210-mpp-115.html#post2982127

That's stange, both links (the one Joachim posted and the one you posted) bring me to the same page #574

 

[brianco]

Jacco posted TWO apparently identical posts. The earlier one of these takes you to a different page than does the later one. The problem is the use of abbreviated links.

 

[jacco vermeulen]

With copy & paste such links on the same page, you can do fun stuff with the cache memory on your PC.

 

[FdW]

One small update, the power supply has been fixed. And the LME49710's have been checked. To my amazement thy survived (running on +15 and -25 volts). So the big disasters is in fact not so big at all

Next I have to replace the vas-transistors and figure why I could not set bias (I di suspect one of the driver mosfets). I'l b' b'ck

Another update, it's a amplifier, the bias can be set, the gain is as expected, and (while using the 100 Watt lamp in the power supply) it can (and did) kill a 250 mW 10 Ohm resistor that posed as a loudspeaker

Tomorrow more testing with the lamp in place, and maybe a few watts of music (you see I am getting very careful (maybe a bit to )).

This is all going on very slow due to work being very demanding at the moment, but I am getting there.

 

[Joachim Gerhard]

Yes, building high power amps is harder then making low level stuff.

 

[Joachim Gerhard]

You know that i like buffers. Here is an distortion canceling design by our Dimitry :JFET Follower Amplifier Cancels Distortion

 

[Joachim Gerhard]

I ordered a new LCR meter :
PeakTech® 2170 - PeakTech® - Spitzentechnologie, die überzeugt

 

[Joachim Gerhard]

Audible Color - Audio Visual Instrument by Hideaki Matsui & Momo Miyazaki Yanko Design

 

[FdW]

You know that i like buffers. Here is an distortion canceling design by our Dimitry :JFET Follower Amplifier Cancels Distortion

Looks very nice, I will study that, thanks for the link.

 

[FdW]

I ordered a new LCR meter :
PeakTech® 2170 - PeakTech® - Spitzentechnologie, die überzeugt

And I did order
Rigol DS2102 DSO !!Special offer!!

 

[Bksabath]

Do not use the triplicator
The danger is that one version of you the good one is sent far far away
The other even further.

So not a chance to get the 2 to merge and you get stuck with bad one spelling mistakes and all.

 

[hesener]

Almost finished stuffing the second board Just waiting for some micas for the power transistors.

Now I am in trouble with the riaa caps... my sourcing went wrong and bought amtrans caps from hificollective... too much variation... need to use big caps I have in stock (REL-CAP 15n) so I will use an external riaa after all.

To connect the external riaa, is it sufficient to connect it to the indicated place in the board or do I need to do some shunts ?

Hi, you can just connect to the place indicated on the board. Important: NO external ground connection, please just connect there and nowhere else. You may want to shield the circuit (depending on how far away you place it) and return the shield to the input ground of the amplifier.

 

[hesener]

You know that i like buffers. Here is an distortion canceling design by our Dimitry :JFET Follower Amplifier Cancels Distortion

Beautiful ;-)

 

[RCruz]

Hi, you can just connect to the place indicated on the board. Important: NO external ground connection, please just connect there and nowhere else. You may want to shield the circuit (depending on how far away you place it) and return the shield to the input ground of the amplifier.

Thank you

It will be a small board just over the existing space.

 

[RCruz]

Audible Color - Audio Visual Instrument by Hideaki Matsui & Momo Miyazaki Yanko Design

I believe optical cables eqiped systems use light amplification to retreive info right ?

 

[hesener]

Thank you

It will be a small board just over the existing space.

That should work like a charm - don't know why but I was envisioning something like this: