SP-207 Exciter from laserfaq.org

S

Stoffel

Guest
Hi,

my name is Stoffel and this is my first post here. I hope making all right
here.
For my new HE/NE Laser i have to built a Exciter. It is a SP-107 Laser and
me was told to built a SP-207 Exciter
(http://www.laserfaq.org/slf/207apsch.pdf). I found the plan at Sam´s Laser
FAQ. Now I´m looking for the components for this circuit and i found all
things except the capasitors .22uF 6KV. So I looked for capasitors and the
biggest I found was a .022uF 6kV. I asked an electrican and he told me that
those capasitors are nowhere. Now I don´t know whats up with this circuit.
Are these special capasitors where I can´t get anywhere or is this a mistake
in writing and means actual .022uF 6kV ?!? I hope someone in here can help
me.
Thank you for your answers.
Sorry for my bad english school is long time ago ...

Greets
Stoffel
 
"Stoffel" <usenet@dauprinz.de> writes:

Hi,

my name is Stoffel and this is my first post here. I hope making all right
here.
For my new HE/NE Laser i have to built a Exciter. It is a SP-107 Laser and
me was told to built a SP-207 Exciter
(http://www.laserfaq.org/slf/207apsch.pdf). I found the plan at Sam´s Laser
FAQ. Now I´m looking for the components for this circuit and i found all
things except the capasitors .22uF 6KV. So I looked for capasitors and the
biggest I found was a .022uF 6kV. I asked an electrican and he told me that
those capasitors are nowhere. Now I don´t know whats up with this circuit.
Are these special capasitors where I can´t get anywhere or is this a mistake
in writing and means actual .022uF 6kV ?!? I hope someone in here can help
me.
Click to expand...
They are large capacitors. You can use 10 of the 0.022 uF 6 kV caps
in parallel but the correct capacitors are available. They would likely
be very expensive though. It's not a typo.

However, I would recommend you just pick up an SP-255 on eBay. Even to
your location, the cost will be much less than building one. There is
info in the Laser FAQ on using an SP-255 with the SP-107 tube. SP-207s
also show up from time to time. I run my SP-107/907s from an SP-255.

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: The email address in this message header may no longer work. To
contact me, please use the Feedback Form at repairfaq.org. Thanks.
 
Hi Sam,

thanks for your fast information. On eBay are no exciters in time. I have
connections to a company that builts transformers and with a transformer i
think its not so complicatet to built such a circuit. They have the
transistors, the potentiometer and lot of other things too. So I only have
to buy the capacitors and the resistors. I think it will not be sooooo
expensive. Only the capacitors are the big problem. The chef in the company
said that i can put three 2kv capacitors with a capacity of .68uF in a array
instead of one .22uf 6kv capacitor.
I hope i find capacitors for my project and that they will not be so
expensive.
I thought it was a mistake in the circuit on your site but now i know i have
to look for those big capacitys whatever how. The only thing where i found
those bis capacitors was on your site and on a radio station :)

Again mutch thanks for your fast answer and the clarification of the fact.

Maybe i can use really a SP-255 but me was told that the "ignition voltage"
can be to less with the sp255 ?!?

Bye
Stoffel


They are large capacitors. You can use 10 of the 0.022 uF 6 kV caps
in parallel but the correct capacitors are available. They would likely
be very expensive though. It's not a typo.

However, I would recommend you just pick up an SP-255 on eBay. Even to
your location, the cost will be much less than building one. There is
info in the Laser FAQ on using an SP-255 with the SP-107 tube. SP-207s
also show up from time to time. I run my SP-107/907s from an SP-255.
Click to expand...
 
"Stoffel" <usenet@dauprinz.de> writes:

Hi Sam,

thanks for your fast information. On eBay are no exciters in time. I have
connections to a company that builts transformers and with a transformer i
think its not so complicatet to built such a circuit. They have the
transistors, the potentiometer and lot of other things too. So I only have
to buy the capacitors and the resistors. I think it will not be sooooo
expensive. Only the capacitors are the big problem. The chef in the company
said that i can put three 2kv capacitors with a capacity of .68uF in a array
instead of one .22uf 6kv capacitor.
Click to expand...
You could do that but it's better to parallel capacitors than to put them
in series because if the voltage doesn't distribute evenly, one or two
caps will see higher than 1/3 of the total.

I hope i find capacitors for my project and that they will not be so
expensive.

I thought it was a mistake in the circuit on your site but now i know i have
to look for those big capacitys whatever how. The only thing where i found
those bis capacitors was on your site and on a radio station :)

Again mutch thanks for your fast answer and the clarification of the fact.

Maybe i can use really a SP-255 but me was told that the "ignition voltage"
can be to less with the sp255 ?!?
Click to expand...
Yes, there's info in the Laser FAQ to add an simple external circuit to boost
it.

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: The email address in this message header may no longer work. To
contact me, please use the Feedback Form at repairfaq.org. Thanks.
 
Hi Sam,

i looked in ebay.com and ebay.de and found no exciters like sp207 or sp255.
Now i decided to built a switching power supply for the laser because of
choosing mutch smaller capacitors. What do you mean to this idea? Can it
work or is there a thinking bug? With a frequency of 50kHz i can use smaller
capacitors instead of the big expensive ones. 6kv .22uF will be 6kv .0022uF
then. I think i can work so. It will be nice if you tell me your thoughts to
this idea.

Bye
Stoffel
 
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