dingo

Re: APP Studio Ing's products
« Reply #800 on: November 06, 2014, 05:24:33 PM »
hello!
this is a new gyrators equalizer, it has been designed by PPA(Pierpaolo) for500rack
He has sent me 4 prototype pcb 's and  I have assembled them with his schematic.

It uses old and modern inedit discrete  topology using doa's
the gyrators use germanium transistor
it sound great! i like it so much.

This eq has a vintage sound -mids, basses are very good but high are fantastic
it has the particularity to not change the features of the sound at max boost/cut as an eq should do.
Moreover, with max gain you don 't keep noise or garbage,very quiet gear

I don't know if Pier Paolo has intention to put it inthe diy market, you shoud ask him!! ;)
dingo.







here with his big brother..






dogma

looks stunning.    Pier is such an amazing designer the world should know about him.....

ppa

Thanks dingo and dogma !!

Krcwell

Hi Pier,

Do you plan to offer kits for this eq?

Thanks,

Keith

Potato Cakes

Can the LED meter be used with the MA1 preamp? I noticed there are connections for it on the board. I also  noticed that there are several taps for potential add ons to the preamp. Are there any plans to do so?

Thanks!

Paul

ppa

Can the LED meter be used with the MA1 preamp? I noticed there are connections for it on the board. I also  noticed that there are several taps for potential add ons to the preamp. Are there any plans to do so?

Thanks!

Paul

Yes, I am developing a meter with 8 LED's for MA1. 

Potato Cakes

Sorry for all the questions, but can you give me the dimensions of the APP992 DIP8 PCB? I am wanting to change out the ICs in some of my existing gear with this, but don't know if it will fit in some of the spaces. Do you also offer this as a dual opamp so I can use them instead of ICs like the NE5532?

Thanks!

Paul

ppa

Sorry for all the questions, but can you give me the dimensions of the APP992 DIP8 PCB? I am wanting to change out the ICs in some of my existing gear with this, but don't know if it will fit in some of the spaces. Do you also offer this as a dual opamp so I can use them instead of ICs like the NE5532?

Thanks!

Paul

I am going to send you an email with all dimensions and features


Re: APP Studio Ing's products - MA1 Germanium pre - APP992 fet DOA
« Reply #808 on: May 18, 2015, 12:38:04 PM »
A little feedback on app 2050 installed in a classic api 312.
The doa compared to the 2520 have more level of dynamics, more headroom, more bandpass and fastest transient.
Obviously it's a modern doa and it's less "compressed"  then the 2520 but still have the classic "mid forward".
For me it's incredible on acoustic instrument and in 24v "mode"  is quite usable for classic music.
Thanks Pier Paolo

Re: APP Studio Ing's products - APP992 fet DOA
« Reply #809 on: May 29, 2015, 08:11:04 AM »
Hi Pier, in the last time i've assembled some different DOA's models

But at the end i've choose Your superfast APP992 to implement an analog stage for a custom AD converter ( using PCM4222EVM) that i'm cooking


Re: APP Studio Ing's products - APP992 fet DOA
« Reply #810 on: May 29, 2015, 08:16:14 AM »
From the first preliminary test Your DOA 992 seems to catch transients really well

: )

Re: APP Studio Ing's products - APP992 fet DOA
« Reply #811 on: May 30, 2015, 09:01:10 AM »
Ops...and i have forgot to thanks You Pier cause i've ended my mic pre too using Your APP1040 pcb.

As You can see i've experiment a bit using a neutrik NTM4 input transformer paired with proper resistor value. The out transfo is a Cinemag ...and the doa is a neumann oa10

...and the results is outstanding ( at least for me)

okgb

Re: APP Studio Ing's products - APP992 fet DOA
« Reply #812 on: June 18, 2015, 07:17:35 PM »

 Pier, is a High integrity kind of guy. I've been happy with the opamps & preamps I've ordered from him
so I'll be checking out the  APP992 fet DOA .........................
GKB Audio / Greg Boboski

Vac11

Re: APP Studio Ing's products - APP992 fet DOA
« Reply #813 on: September 24, 2015, 08:38:39 AM »
Hi Pier,

thanks for APP992´s.

Hope, that my solder joints are OK... I'll see (hear) in a few weeks :-)

MV

Vac11

Re: APP Studio Ing's products - APP992 fet DOA
« Reply #814 on: September 24, 2015, 08:39:25 AM »
2

Vac11

Re: APP Studio Ing's products - APP992 fet DOA
« Reply #815 on: September 24, 2015, 08:39:55 AM »
3

druu

Re: APP Studio Ing's products - APP992 fet DOA
« Reply #816 on: September 27, 2015, 05:12:30 AM »
Vac11, if i'm not mistaken, you have mounted the DOA's upside down. They should be mounted atypical of other DOA mountings (i.e. PCB traces facing upward).

kante1603

Re: APP Studio Ing's products - APP992 fet DOA
« Reply #817 on: September 27, 2015, 05:44:57 AM »
Vac11, if i'm not mistaken, you have mounted the DOA's upside down. They should be mounted atypical of other DOA mountings (i.e. PCB traces facing upward).
You´re right druu,all are upside down ::) 
Look here:


http://groupdiy.com/index.php?topic=49711.msg633968#msg633968


Best,


Udo.


Edit:Link attached
« Last Edit: September 27, 2015, 05:54:49 AM by kante1603 »

ppa

Re: APP Studio Ing's products - APP992 fet DOA
« Reply #818 on: September 27, 2015, 10:53:06 AM »
Hi All,

the first version APP992 was  upside down, instead the actual version (from a few of years ago) is normal as Vac11 did.


Pier Paolo
 

kante1603

Re: APP Studio Ing's products - APP992 fet DOA
« Reply #819 on: September 27, 2015, 11:40:48 AM »
That will make Vac 11 a happy guy ;D
I hope the build hasn´t changed technically?

Best,


Udo.