SSM2019 preamp

[ThomasT]

Hi!

I know theres another thread about preamp designs...

What do you (the preamps profies...) think about taking an SSM2019 in
combination with a SSM2142 as ouptput stage. Would this make a usable
preamp for uncritical stuff? Toms, dummy-tracks etc.pp. 60dB gain is
more than enough.

What quality can I expect?

Since the place on a 160mmx100mm PCB is limited what compromises can
be made. And which shall not?

Thanks
Thomas

[Scott Dorsey]

ThomasT > wrote:
>
>What do you (the preamps profies...) think about taking an SSM2019 in
>combination with a SSM2142 as ouptput stage. Would this make a usable
>preamp for uncritical stuff? Toms, dummy-tracks etc.pp. 60dB gain is
>more than enough.

I don't know anyone who has really listened seriously to the 2019 yet.
Give it some time; it's still very new.

I can say the INA 103 is pretty good if you want a one-chip solution.

>Since the place on a 160mmx100mm PCB is limited what compromises can
>be made. And which shall not?

With the INA 103 the big problem is that it's very sensitive to local
magnetic fields, so the chip needs to be a few inches away from even a
toroidal power transformer.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

[Mike]

On 13 Nov 2003 12:06:40 -0500, (Scott Dorsey) wrote:

>With the INA 103 the big problem is that it's very sensitive to local
>magnetic fields, so the chip needs to be a few inches away from even a
>toroidal power transformer.
>--scott

Interesting - Scott, do you know if the INA163 suffers from the same
glitch ? (nice to know BEFORE laying out the PCB)
cheers
M

[Scott Dorsey]

Mike > wrote:
>On 13 Nov 2003 12:06:40 -0500, (Scott Dorsey) wrote:
>
>>With the INA 103 the big problem is that it's very sensitive to local
>>magnetic fields, so the chip needs to be a few inches away from even a
>>toroidal power transformer.
>
>Interesting - Scott, do you know if the INA163 suffers from the same
>glitch ? (nice to know BEFORE laying out the PCB)

I have no idea. I have only briefly used the INA163.

I do know that with the INA103, the noise floor is higher if you use the
internal gain setting resistor to set it to 40 dB, compared with using an
external resistor to set it to 40 dB.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

[Pooh Bear]

ThomasT wrote:

> Hi!
>
> I know theres another thread about preamp designs...
>
> What do you (the preamps profies...) think about taking an SSM2019 in
> combination with a SSM2142 as ouptput stage. Would this make a usable
> preamp for uncritical stuff? Toms, dummy-tracks etc.pp. 60dB gain is
> more than enough.

That's a lot of money for 'uncritical stuff'.

I like to design with discretes for the front-end.

As for output stage, SSM just do a handy package. You can do just as well
with other ICs if you know how to configure them.

> What quality can I expect?

Pretty reasonable knowing SSM.

> Since the place on a 160mmx100mm PCB is limited what compromises can
> be made. And which shall not?

That's a big pcb. What else is on it ? What compromises do you think you
might *need* to make ?



Graham

[Thomas Thiele]

Pooh Bear wrote:

> That's a lot of money for 'uncritical stuff'.

Your right. After looking at the prices the idea seems not so good
anymore.
Would be more than 160Eus/$. And for about 250 there are some
solutions out there.
At first I wanted to wait for the RME octapre. But 1000$ for a nearly
unused device...
Would be another nice mic.

> I like to design with discretes for the front-end.

> As for output stage, SSM just do a handy package. You can do just as well
> with other ICs if you know how to configure them.

> That's a big pcb. What else is on it ? What compromises do you think you
> might *need* to make ?

I forgot to say, 6-8 preamps. I skiped the idea to buy a mixer for
that.
I really dont't need it. I have 8 usable to good preamps and channel
strips.
I just need at least 6 additional preamps.

Compromises means layout compromizes.