Power supply design for power operational amplifier

[Gundal21]

Thanks for everyone who shows this message.

I always get so much help from this groups and wait the day when I
could give my help to someone here. (^^)

I have one question about the power supply problem.
I am using the PA series power operational amplifier chip for
ultrasonic applications. The chip was developed by Apexmirotech but is
being produced by Cirrus Logic corp. I made some driving circuit using
this chip but I don't know how to make its power supply part. For
example, is it OK to use the circuit as everyone knows, consisting of
a transformer, 4 diodes and some other capacitors? If the output is
some ten volts, I should use the 78XX regulator. But the power supply
I want requires at least 100V (to make matters worse I need two
polarity i.e. + and -).
I majored in mechanics and have studied electronics by myself, for
example operational amplifier. So, I have no friends to help my
situation. In addition, I cannot found anywhere the good materials for
power supply circuit or design.
Please give me any comments on this subject.

 

[John G.]

I used a PA91 (or so) in an amplifier with a +/-200V output. If I
recall correctly, the power supply was just a transformer, bridge (or
+ and - full wave) rectifier, and suitable filter capacitors - no
regulation. The physicists using the things haven't complained about
the performance.

Peter Bennett, VE7CEI

How about a transformer with 3 or 4 windings, and a Tube type 80, a couple
of 16 mfd electros and an old speaker field coil for a choke.

This sort of stuff was so commonplace once.
Are you integrated chip specialists wimps when it come to voltages over 5?

John G.

 

[[email protected]]

That would work.




I'm not sure what you're trying to be snide about.  The OP declares that
he doesn't know much about electronics, and it very much sounds like he's
doing a one-off.

You want he should spend a year learning how to design a switching supply
that'll do this all in four cubic inches of space, while watching his
market window snap shut?

Perfection is the enemy of good enough.

--http://www.wescottdesign.com- Hide quoted text -

- Show quoted text -

I didn't read John. G 's response as being snide...just a little
friendly good humour that's all. Of course nobody expects this guy to
become an electronics designer overnight...however tubes and chokes
are old technology and not so easy to learn about in this day and
age...to wit..."the art of electronics" by H & H-nothing about
thermionic valves...sure old ARRL books will have stuff as my old
Mullard tube manuals do..but not so easy to get hold of nowadays
especially if one is not from an electronics background. just my
tuppence worth (shows my age)
Daniel

 

[John G.]

That would work.




I'm not sure what you're trying to be snide about. The OP declares that
he doesn't know much about electronics, and it very much sounds like he's
doing a one-off.

You want he should spend a year learning how to design a switching supply
that'll do this all in four cubic inches of space, while watching his
market window snap shut?

Perfection is the enemy of good enough.

--http://www.wescottdesign.com- Hide quoted text -

- Show quoted text -

I didn't read John. G 's response as being snide...just a little
friendly good humour that's all. Of course nobody expects this guy to

become an electronics designer overnight...however tubes and chokes
are old technology and not so easy to learn about in this day and
age...to wit..."the art of electronics" by H & H-nothing about
thermionic valves...sure old ARRL books will have stuff as my old
Mullard tube manuals do..but not so easy to get hold of nowadays
especially if one is not from an electronics background. just my
tuppence worth (shows my age)
Daniel

Thanks Daniel,
It was meant to be lighthearted. Who would use an 80 when you could get a
5Y3GT?
There often seems to be an aversion to hi voltage power supplies in this
group when in another time they were so commonplace.
Who hasn't put his finger on an 807 thinking it was a grid cap and listening
for the buzz but getting a buzz instead.

John G.

 

[Rich Grise]

become an electronics designer overnight...however tubes and chokes
are old technology and not so easy to learn about in this day and
age...to wit..."the art of electronics" by H & H-nothing about
thermionic valves...sure old ARRL books will have stuff as my old
Mullard tube manuals do..but not so easy to get hold of nowadays
especially if one is not from an electronics background. just my
tuppence worth (shows my age)
Daniel

Thanks Daniel,
It was meant to be lighthearted. Who would use an 80 when you could get a
5Y3GT?
There often seems to be an aversion to hi voltage power supplies in this
group when in another time they were so commonplace.
Who hasn't put his finger on an 807 thinking it was a grid cap and listening
for the buzz but getting a buzz instead.

When I was in 12th grade physics, there was a little room behind the
classroom where they had a scope, and an old TV and a whole bunch of other
physics-class-ey stuff; I thought I'd measure the waveform at the plate
cap of the horizontal output tube. Had the scope on 100V/div or whatever -
I knew it was going to be more than just a couple of volts!

Drew an arc to the probe at least 2" long. Nothing got hurt - it was a
tube-type scope (tek 545-style).

Ah, those were the days! ;-)

Cheers!
Rich