Off the shelf amplifier modules

N

nospam

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A customer has a customer who has a requirement to drive some equipment
with a 50 ohm input from a generator that can't drive 50 ohms.

I don't know what the generator is, probably DACs on a PC data acquisition
type card.

Frequency response requirement might be just dc, can't be more that a few
10's of kHz or their generator would have decent outputs to start with.

Maximum required output 0 to 10v dc into 50 ohms, gain unity or maybe x 2.

Anyone know of anything off the shelf and moderately priced that would do
this? Multiple channels might be a plus.

TIA.
--
 
nospam wrote:
A customer has a customer who has a requirement to drive some equipment
with a 50 ohm input from a generator that can't drive 50 ohms.

I don't know what the generator is, probably DACs on a PC data acquisition
type card.

Frequency response requirement might be just dc, can't be more that a few
10's of kHz or their generator would have decent outputs to start with.

Maximum required output 0 to 10v dc into 50 ohms, gain unity or maybe x 2.

Anyone know of anything off the shelf and moderately priced that would do
this? Multiple channels might be a plus.
Click to expand...

At least give a little information. Frequency range? Required drive
level? Output level of the generator?


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Michael A. Terrell wrote:
nospam wrote:
A customer has a customer who has a requirement to drive some equipment
with a 50 ohm input from a generator that can't drive 50 ohms.

I don't know what the generator is, probably DACs on a PC data acquisition
type card.

Frequency response requirement might be just dc, can't be more that a few
10's of kHz or their generator would have decent outputs to start with.

Maximum required output 0 to 10v dc into 50 ohms, gain unity or maybe x 2.

Anyone know of anything off the shelf and moderately priced that would do
this? Multiple channels might be a plus.


At least give a little information. Frequency range? Required drive
level? Output level of the generator?
Click to expand...
Ahm, he just gave all that above.

I guess this is what the OP is looking for:
http://cgi.ebay.com/HP-6827A-BiPolar-DC-Power-Supply-Amplifier-100v-0-5_W0QQitemZ350134275113QQihZ022QQcategoryZ58288QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.
 
Joerg <notthisjoergsch@removethispacbell.net> wrote:


Ahm, he just gave all that above.

I guess this is what the OP is looking for:
http://cgi.ebay.com/HP-6827A-BiPolar-DC-Power-Supply-Amplifier-100v-0-5_W0QQitemZ350134275113QQihZ022QQcategoryZ58288QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Click to expand...
Well thanks for the pointer to something that would do the job although the
form factor isn't quite what I imagined. I was thinking more along the
lines of a little box with a wall wart or DIN rail mounted module taking
24v dc supply not something that would need its own shelf to do 4 channels.
I have since discovered the generator is a PC data acquisition card with a
max output current of 5mA.

Still haven't found anything, perhaps not an easy thing to search for but I
didn't think the requirement was so obscure.

Maybe I should be looking for audio amplifiers hoping to find something dc
coupled with well defined gain?

--
 
nospam wrote:
Joerg <notthisjoergsch@removethispacbell.net> wrote:



Ahm, he just gave all that above.

I guess this is what the OP is looking for:
http://cgi.ebay.com/HP-6827A-BiPolar-DC-Power-Supply-Amplifier-100v-0-5_W0QQitemZ350134275113QQihZ022QQcategoryZ58288QQssPageNameZWDVWQQrdZ1QQcmdZViewItem


Well thanks for the pointer to something that would do the job although the
form factor isn't quite what I imagined. I was thinking more along the
lines of a little box with a wall wart or DIN rail mounted module taking
24v dc supply not something that would need its own shelf to do 4 channels.
I have since discovered the generator is a PC data acquisition card with a
max output current of 5mA.

Still haven't found anything, perhaps not an easy thing to search for but I
didn't think the requirement was so obscure.

Maybe I should be looking for audio amplifiers hoping to find something dc
coupled with well defined gain?

Most audio amplifiers will deliberately NOT pass DC, in order to avoid
Click to expand...
destroying speakers.

Maybe something like this, with a few extra parts:

http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?jameco_page=46&langId=-1&productId=120723&drill_parents=category_root%24%2410%24%241015&drill_children=10%24%241015%24%24101505&catalogId=10001&storeId=10001&search_type=all&drill_displays=ICs+%26+Semiconductors+%2F+Analog%2FLinear+%2F+Amplifiers&ddkey=http:parametricSearchResultsView


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In article <9ramj4178uaqfq9b8e0lmdujqkdfmc0sfi@4ax.com>,
nospam <nospam@please.invalid> wrote:

I have since discovered the generator is a PC data acquisition card with a
max output current of 5mA.

Still haven't found anything, perhaps not an easy thing to search for but I
didn't think the requirement was so obscure.
Click to expand...
NS-

What you describe sounds something like a servo amplifier or
instrumentation amplifier. It is not obscure, its just not a consumer
item! It might be available from the same place that produced the data
acquisition card.

If you want to build your own, what about using a power op amp?

Fred
 
nospam wrote:
Joerg <notthisjoergsch@removethispacbell.net> wrote:


Ahm, he just gave all that above.

I guess this is what the OP is looking for:
http://cgi.ebay.com/HP-6827A-BiPolar-DC-Power-Supply-Amplifier-100v-0-5_W0QQitemZ350134275113QQihZ022QQcategoryZ58288QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

Well thanks for the pointer to something that would do the job although the
form factor isn't quite what I imagined. I was thinking more along the
lines of a little box with a wall wart or DIN rail mounted module taking
24v dc supply not something that would need its own shelf to do 4 channels.
I have since discovered the generator is a PC data acquisition card with a
max output current of 5mA.

Still haven't found anything, perhaps not an easy thing to search for but I
didn't think the requirement was so obscure.

Maybe I should be looking for audio amplifiers hoping to find something dc
coupled with well defined gain?
Click to expand...
They usually all have well defined gain. You'd have to find one that can
muscle the required swing into a 50ohm load without excessive distortion
and with some margin, then hack it so it'll pass down to DC.

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.
 
nospam wrote:
A customer has a customer who has a requirement to drive some equipment
with a 50 ohm input from a generator that can't drive 50 ohms.

I don't know what the generator is, probably DACs on a PC data acquisition
type card.

Frequency response requirement might be just dc, can't be more that a few
10's of kHz or their generator would have decent outputs to start with.

Maximum required output 0 to 10v dc into 50 ohms, gain unity or maybe x 2.

Anyone know of anything off the shelf and moderately priced that would do
this? Multiple channels might be a plus.
I used to use Elantec chips to do this, but
Click to expand...
recently have switched to the HA5002 for new
projects. You can get DC to 50 MHz at up to +/-
12 V or so into 50 Ohms.

Jon
 
On Sun, 07 Dec 2008 02:07:56 +0000, nospam <nospam@please.invalid>
wrote:

Joerg <notthisjoergsch@removethispacbell.net> wrote:


Ahm, he just gave all that above.

I guess this is what the OP is looking for:
http://cgi.ebay.com/HP-6827A-BiPolar-DC-Power-Supply-Amplifier-100v-0-5_W0QQitemZ350134275113QQihZ022QQcategoryZ58288QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

Well thanks for the pointer to something that would do the job although the
form factor isn't quite what I imagined. I was thinking more along the
lines of a little box with a wall wart or DIN rail mounted module taking
24v dc supply not something that would need its own shelf to do 4 channels.
I have since discovered the generator is a PC data acquisition card with a
max output current of 5mA.

Still haven't found anything, perhaps not an easy thing to search for but I
didn't think the requirement was so obscure.

Maybe I should be looking for audio amplifiers hoping to find something dc
coupled with well defined gain?
Click to expand...
Perhaps a DC servo amplifier is close to what you want.
 
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