small hv supplies

[John Larkin]

Hi,

I need a couple of small potted-brick HV supplies for a pollen-sorting
device, to be used in the field. I was thinking about the little
inverters that have a dc output proportional to input, 1-3 kv range,
I'm guessing. We don't need current, as this will be pure
electrostatics. Apart from the pirates at Pico, who makes stuff like
this? I don't see any in Mouser or Digikey. Surplus would be fine...
some sort of copying machine thing?

Anybody played with stuff like this?

John

 

[Michael A. Terrell]

Hi,

I need a couple of small potted-brick HV supplies for a pollen-sorting
device, to be used in the field. I was thinking about the little
inverters that have a dc output proportional to input, 1-3 kv range,
I'm guessing. We don't need current, as this will be pure
electrostatics. Apart from the pirates at Pico, who makes stuff like
this? I don't see any in Mouser or Digikey. Surplus would be fine...
some sort of copying machine thing?

Anybody played with stuff like this?

John

Will you have AC available where these are used? There are some nice
supplies made for copiers and laser printers that might be suitable.
How much space do you have? I may still have a couple clean, used
supplies that you can have. Another source might be one of those cheap
4" B&W $10 TV sets. Remove the PC board and just use the Horizontal
drive circuit and flyback, fed from a 15,734 HZ pulse.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[John Woodgate]

In message <[email protected]>, dated Fri, 4

I need a couple of small potted-brick HV supplies for a pollen-sorting
device, to be used in the field. I was thinking about the little
inverters that have a dc output proportional to input, 1-3 kv range,
I'm guessing. We don't need current, as this will be pure
electrostatics. Apart from the pirates at Pico, who makes stuff like
this? I don't see any in Mouser or Digikey. Surplus would be fine...
some sort of copying machine thing?

Anybody played with stuff like this?

You could modify spark igniters.

 

[[email protected]]

Hi,

I need a couple of small potted-brick HV supplies for a pollen-sorting
device, to be used in the field. I was thinking about the little
inverters that have a dc output proportional to input, 1-3 kv range,
I'm guessing. We don't need current, as this will be pure
electrostatics. Apart from the pirates at Pico, who makes stuff like
this? I don't see any in Mouser or Digikey. Surplus would be fine...
some sort of copying machine thing?

Anybody played with stuff like this?

You could use a photomultiplier power supply - more current than you
need, and probably better stability than you want to pay for.

Or you could look at Jim Williams application notes on drivers for
cold-cathode lamps for back-lighting lap-top displays. The lamps use HV
AC, so you'd have to add a rectifier - possibly a Cockroft-Walton
voltage multiplier if you really don't need much current.

Check out application notes AN45, AN49, AN51, AN55, AN61, AN65.

The only thing wrong with them is that he is using a Baxandall inverter

and calling it a current-driven Royer inverter.

Peter Baxandall described his parallel- and series-resonant class-D
oscillators in 1959 in a paper in the Proceedings of the (British)
Institute of Electrical Engineers (Baxandall, P.J, Proc I.E.E 106, B,
748 (1959)).

 

[Joerg]

Hello John,

I need a couple of small potted-brick HV supplies for a pollen-sorting
device, to be used in the field. I was thinking about the little
inverters that have a dc output proportional to input, 1-3 kv range,
I'm guessing. We don't need current, as this will be pure
electrostatics. Apart from the pirates at Pico, who makes stuff like
this? I don't see any in Mouser or Digikey. Surplus would be fine...
some sort of copying machine thing?

Glassman makes HV bricks but they could be out of BOM budget in this case:

http://www.glassmanhv.com/ByWattage/mj_series.shtml

Anybody played with stuff like this?

Usually made my own. With flyback transformers or whatever was cheap.
The TV parts mostly came with the diode cascade included as a bonus

Bug zappers also have nice HV transformers in them but they won't be
much good above line frequency. However, since you don't need any
current to speak of and thus not much capacitance after the rectifier
they might work.

Yet another option would be if you could find Hi-Pot testers in an
auction or at a used electronics dealer. We only have one such dealer in
town but S.F. has got to be a lot better there.

 

[Genome]

Hi,

I need a couple of small potted-brick HV supplies for a pollen-sorting
device, to be used in the field. I was thinking about the little
inverters that have a dc output proportional to input, 1-3 kv range,
I'm guessing. We don't need current, as this will be pure
electrostatics. Apart from the pirates at Pico, who makes stuff like
this? I don't see any in Mouser or Digikey. Surplus would be fine...
some sort of copying machine thing?

Anybody played with stuff like this?

John

Have I had my antihistamine tablet or am I sneezing because this is about
pollen? Oh yeah, I remember, this piriton is to stop an allergic reaction to
alcohol so I can drink more.

Anyway, how does that work?

You know.... like if you are sorting pollen then it sounds like you are
sorting pollen so sticking 3kV across stuff sounds like it goes and sticks
all the pollen on one of the electrodes and it isn't sorted. Like it's all
stuck on one electrode so it isn't sorted.

So, what's the other part of the sorting process?

Ta

DNA

 

[Sven Wilhelmsson]

In message <[email protected]>, dated Fri, 4


You could modify spark igniters.

Like piezoelectric lighters for cigarettes. Where I live, they can be found
en masse in the streets.

 

[John Woodgate]

Like piezoelectric lighters for cigarettes. Where I live, they can be
found en masse in the streets.

Not so easy to use piezo lighters, because pollen sorters need a fairly
continuous supply of high voltage. Battery-operated spark lighters would
work.

 

[Joerg]

Hello John,

Out here they have usually been transformed into flat structures by the
time you see them. Truck tires are unforgiving.

Not so easy to use piezo lighters, because pollen sorters need a fairly
continuous supply of high voltage. Battery-operated spark lighters would
work.

Just watch out for whether there is anything other than the battery that
limits the number of sparks. After seeing the "electrolytic" in a
disposable camera I realized why they are called disposable. Had been
used once and the thing was already bulging.

 

[Mike Harrison]

Hi,

I need a couple of small potted-brick HV supplies for a pollen-sorting
device, to be used in the field. I was thinking about the little
inverters that have a dc output proportional to input, 1-3 kv range,
I'm guessing. We don't need current, as this will be pure
electrostatics. Apart from the pirates at Pico, who makes stuff like
this? I don't see any in Mouser or Digikey. Surplus would be fine...
some sort of copying machine thing?

Anybody played with stuff like this?

John

A CCFL backlight inverter with a couple of stages of CW multiplier might work. ( Use fast diodes
like UF4007)

 

[scada]

Yes.
www.emcohighvoltage.com
I designed two 1KV @ 15ma Supplies with them. The module I used had
continuos current limiting, 0-5V linear control, a few other features I
don't recall just now. Been in service about a year now, no failures.

 

[John Larkin]

Yes.
www.emcohighvoltage.com
I designed two 1KV @ 15ma Supplies with them. The module I used had
continuos current limiting, 0-5V linear control, a few other features I
don't recall just now. Been in service about a year now, no failures.

Nice. G60CT looks good.

http://www.emcohighvoltage.com/CTseries.PDF

thanks,

John

 

[CC]

Hi,

I need a couple of small potted-brick HV supplies for a pollen-sorting
device, to be used in the field. I was thinking about the little
inverters that have a dc output proportional to input, 1-3 kv range,
I'm guessing. We don't need current, as this will be pure
electrostatics. Apart from the pirates at Pico, who makes stuff like
this? I don't see any in Mouser or Digikey. Surplus would be fine...
some sort of copying machine thing?

Why do you refer to Pico as "pirates?" Did they do something bad or
just charge too much?

Someone mentioned Emco and Glassman. There is also Ultravolt.

Good day!

 

[Phat Bytestard]

I don't see any in Mouser or Digikey.

Mouser actually did carry small 2.5 x 3 x .75 inch proportional 3W
bricks for a time. If you have any three year old catalogs, you could
find it. Or you could ask them if they still have any on their shelf
anywhere.

They were 1kV 2kV 3kV and 4kV. 4 pins. Power and output. Full
floater.

 

[Phat Bytestard]

Hi,

I need a couple of small potted-brick HV supplies for a pollen-sorting
device, to be used in the field. I was thinking about the little
inverters that have a dc output proportional to input, 1-3 kv range,
I'm guessing. We don't need current, as this will be pure
electrostatics. Apart from the pirates at Pico, who makes stuff like
this? I don't see any in Mouser or Digikey. Surplus would be fine...
some sort of copying machine thing?

Anybody played with stuff like this?

John

I found these:

http://www.hitekpower.com/pcbmountdc.htm#gma

Twice the power in these:

http://www.hitekpower.com/pcbmountdc.htm#seriesa

 

[Phat Bytestard]

Glassman makes HV bricks but they could be out of BOM budget in this case:

http://www.glassmanhv.com/ByWattage/mj_series.shtml

Dude, you're nuts. That's not a brick! That's a pyramid stone!

"brick" usually refers to PCB mountable, in this case.

Also, 15 Watts is a bit much for his need.

 

[Phat Bytestard]

Like piezoelectric lighters for cigarettes. Where I live, they can be found
en masse in the streets.

Litterbug society. Smokers are lame. Well over 99.9% anyway.

 

[Phat Bytestard]

Not so easy to use piezo lighters, because pollen sorters need a fairly
continuous supply of high voltage. Battery-operated spark lighters would
work.

A piezo is a mere instantaneous spark, not unlike an electrostatic
discharge.

A "sorter" needs a continuous voltage to create an "attractor", as
you correctly stated.

 

[Phat Bytestard]

Yes.
www.emcohighvoltage.com
I designed two 1KV @ 15ma Supplies with them. The module I used had
continuos current limiting, 0-5V linear control, a few other features I
don't recall just now. Been in service about a year now, no failures.

The site I listed makes a better supply than Emco.

Don't be a top posting Usenet retard, dumbass.

 

[Phat Bytestard]

Nice. G60CT looks good.

http://www.emcohighvoltage.com/CTseries.PDF

Epoxy encapsulation... very bad. 100% NON-servicable.