TDA2030 as a Howland pump?

[Martin Griffith]

I don't have TDA2030 at hand, and was wondering if using one as
Howland pump would be problematic at say a 150mA, 9V rails, up to 2KHz

I just want to try something out, probably end up in the junk box

martin

 

[ian field]

I don't have TDA2030 at hand, and was wondering if using one as
Howland pump would be problematic at say a 150mA, 9V rails, up to 2KHz

I just want to try something out, probably end up in the junk box

martin

To save wading through hundreds of google hits on the Howland Pumps plumbing
trade name, here's a NS app note for a Howland pump:

http://www.national.com/an/AN/AN-1515.pdf

 

[Martin Griffith]

To save wading through hundreds of google hits on the Howland Pumps plumbing
trade name, here's a NS app note for a Howland pump:

http://www.national.com/an/AN/AN-1515.pdf

Hi
That pdf was my first port of call, I just wondering if there are any
gotcha's using a poweramp, as I've never used a Howland for more than
a mA or so before, should have TDA2030 to play with early next week

martin

 

[ian field]

Hi
That pdf was my first port of call, I just wondering if there are any
gotcha's using a poweramp, as I've never used a Howland for more than
a mA or so before, should have TDA2030 to play with early next week

martin

There are numerous PA chips that claim to have "the simplicity of an OP
amp", unless you need the current capability of a 20-30W amplifier there are
plenty of 1A power op-amps around - such as the ST L272/L2272 types that can
be lifted foc from older HP/Quantum hard disks.

 

[Martin Griffith]

There are numerous PA chips that claim to have "the simplicity of an OP
amp", unless you need the current capability of a 20-30W amplifier there are
plenty of 1A power op-amps around - such as the ST L272/L2272 types that can
be lifted foc from older HP/Quantum hard disks.

Doh.....thats what happens when you come from an audio background,
think of a audio poweramp first.
(grovelling for some dead Win95 HDD's)

thanks!

martin

 

[ian field]

Doh.....thats what happens when you come from an audio background,
think of a audio poweramp first.
(grovelling for some dead Win95 HDD's)

thanks!

martin

Don't forget Apple - the old one's used a slightly chunkier SCSI Quantum
with the same head positioner chip.

 

[krw]

I don't have TDA2030 at hand, and was wondering if using one as
Howland pump would be problematic at say a 150mA, 9V rails, up to 2KHz

I'm using an LM7171 in a Howland pump, but only about 1/3 that
current. It works great and I have more bandwidth than I can use.
The output impedance is a little dicey though. The Howland needs a
lot of voltage swing from the amplifier though (2/3 dropped by the
output resistor).