Maker Pro
Maker Pro

Off the shelf amplifier modules

N

nospam

Jan 1, 1970
0
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.
--
 
N

nospam

Jan 1, 1970
0
Ahm, he just gave all that above.

I guess this is what the OP is looking for:
http://cgi.ebay.com/HP-6827A-BiPola...ryZ58288QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

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?

--
 
C

CJT

Jan 1, 1970
0
nospam said:
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
destroying speakers.

Maybe something like this, with a few extra parts:

http://www.jameco.com/webapp/wcs/st...ifiers&ddkey=http:ParametricSearchResultsView
 
F

Fred McKenzie

Jan 1, 1970
0
nospam said:
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.

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
 
J

Joerg

Jan 1, 1970
0
nospam said:
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?

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.
 
J

JosephKK

Jan 1, 1970
0
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?

Perhaps a DC servo amplifier is close to what you want.
 
Top