Great RIVER MP2 Finished!

[AW_music]

Hi,
here is our new toy.
Habby birthday!!

Great work done by Mata_Haze!!!

Thanks to:
Ptownkid for the kits
Okgb for the suggestions and help
Neeno for the Irons

:thumb:

 

[okgb]

Nice Work ! Should make Dan proud !

If you haven't added one , a 1/4" unbalenced out is a nice option
i used mine like this for years , driving a hundred feet on classical
stages at times with no problems .

When i made a quad i added a couple of jensen outputs to two
channels and they indeed added a little thickness but for purity
i'd go with the unbal outs

 

[Ptownkid]

What is the small pcb with the ics?

 

[AW_music]

A secret circuit developed by Mata_haze that take care of peak levels!!!
:shock: :grin:
AKA --> Peak Driver! :roll:

 

[3nity]

is that the leds come from??

 

[Ptownkid]

[quote author="AW_music"]A secret circuit developed by Mata_haze that take care of peak levels!!!
:shock: :grin:
AKA --> Peak Driver! :roll:[/quote]

Do tell, more info... :thumb:

 

[Bluzzi]

Beat me to it! Just starting to test mine!

Great job! I think we all want to know if by Peak you mean the LED is a Peak LED rather than an "ON" one. Is it? Doesn't the original PS have an output to drive peak led?

jim

 

[okgb]

the Dan power supply as in the gerbers does have a comparitor
[ sense both pos & neg waveform ] as a peak l.e.d. driver

works well , starts to glow slightly as you approch the level
I.C. driven

Which output xfmrs did you use ? are those the smaller steel
" api " type ? regardless you should notice a big difference
also running an unbal out [ can use also as a non -latency out
for computor recording ]

 

[Sredna]

Greg, do You have the gerbers for the PSU?

Can't find them anywhere, just the gerbers for the main card...

It would be cool to have the PSU-PCB with the peak meters to go
with the original MP-2 PCBs from Ptownkid.

Is there any possibility to have them made?

 

[Bluzzi]

there's a real need for a peak led meter board. Something showing -6db, -3db,0db and +3db. Maybe even leave out -6db. There must be something around already.

anyone have any ideas?

jim

 

[Ptownkid]

[quote author="Sredna"]It would be cool to have the PSU-PCB with the peak meters to go with the original MP-2 PCBs from Ptownkid.

Is there any possibility to have them made?[/quote]

if there's demand, i can do it on the new run of grs

 

[okgb]

I'll dig for the gerbers , the original psu pcb uses surface mount
ics for the comparitor , but one could copy the circuit though

in practice the one l.e.d is fine , you can hear it as it distorts , not
horrible and plenty of warning usually

 

[Bluzzi]

So here's a question Greg. I think its still on subject. I'm curious as to why the circuit is in the power supply and not monitoring the audio signal itself?

The circuit is sensing current draw? Is it that linear that you can tell when a peak is reached? I don't see how it can do this without actually directly monitoring audio?

Just very curious about this.

And yes 1 led is enogh but its nice to see when you get close as well. On my board my peak led lights up with increasing intensity as it approaches 0db and full on when past it. You get a real "feel" for the signal this way.

jim

 

[okgb]

Itr may have been an " addition " that as you can see there is no room
on the preboard , so restate the main reason , otherwise the power
connector has an audio line coming off of the pre to feed the comparitor
nothing to do with the psu .

Could drive a meter seperately if you needed but is the beauty of the
pre set the gain and enjoy , effortless

regards Greg

 

[Bluzzi]

OK, thanks. Signal does come from audio.

Greg, I'm sending you a PM about my problem.

jim

 

[G-Sun]

Thanks for sharing!
I didn't understand the led-driver part of this build
( http://groupdiy.com/index.php?topic=20333.msg702314#msg702314 )
but now things are clearer to me