Re: SG-SP1 Capacitor Charger Section

On Jun 14, 7:59 pm, Sam Goldwasser <s...@xxxxxxxxxxxxxxxxxx> wrote:
Will <mysweeps...@xxxxxxxxxxx> writes:
On Jun 14, 3:57 pm, Will <mysweeps...@xxxxxxxxxxx> wrote:
On Jun 14, 8:44 am, Sam Goldwasser <s...@xxxxxxxxxxxxxxxxxxx> wrote:

Louis Boyd <b...@xxxxxxxxxxxxxxxxxxxx> writes:
Will wrote:
Thanks for your reply. The only reason this crossed my mind in the
first place is I've had a difficult time finding the transformer
listed in SG-SP1 and SP4 (Stancor P-6011, 650v, 70mA. I didn't
exhaust every possible source but the usual suspectes turned up
nothing. Can you point me in the right direction?

A 650 volt transformer will charge a capacitor to the square root of two
times the rated rms voltage, in this case 650 * 1.414 = 919 volts using
a half wave or bridge rectifier.

I believe the normal operating voltage for the SSY-1 pulse forming
network is close to 900 volts.

Yes, in fact, 900 V is probably somewhat high for long life.

I really should add a Variac to that schematic....

--- sam | Sci.Electronics.Repair FAQ:http://www.repairfaq.org/

As luck would have it I do have an old Metro Logic HeNe laser
somewhere packed away. I'll see if I can dig it out. You mentioned
it would work if it had a "shutoff circuit". Is there an example in
the FAQ anywhere or elsewhere?

Again, thanks for everyones input.....

As for a Variac, are there specific specs. that I should home in on?
I believe that my questions are probably making some of you cringe and
probably rightfully so. By trade I am an IT Engineer and this
landscape is unfamiliar but I am learning as I go and understand the
dangers involved and am working with them in the extreme forefront.

A small Variac - 1 to 5 amps, 0 to 115 VAC, or 0 to 140 VAC. Search
for Variac and/or "variable autotransformer" on eBay. For this sort
of application, you shouldn't need to spend more than, say $25 on a
Variac. My motto: "You can never have too many Variacs". :)

--- sam | Sci.Electronics.Repair FAQ: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 Sites:http://www.repairfaq.org/REPAIR/F_mirror.html

Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.

Over the last couple of days I have procured a:

500VA Variable Voltage Regulator(Variac)
60Hz
Input Voltage: 110VAC
Output Voltage: 0-130VAC
Input Connector: 3-prong plug
5 Amp Max Output

And a:

"High voltage power supply board with an inverter transformer for
capacitor charging in solid state YAG lasers. Units need 18-24V and
output a maximum of 1300V at about 30mA short circuit current. These
charge caps VERY FAST!!!"

And am looking for one of the HeNe power supplies mentioned in the FAQ
(Orion 103-23) so I can play along at home following the FAQ
information.

I'll bring the purchased 1300v power/converter/charger online and play
with the input voltages to see what it yields however I had my other
YAG pump chamber in mind for this. In the event it comes down enough
with lower input voltage I'll reevaluate its use after checking to see
if there is a reason that I shouldn't do it for some reason. Going
back a little, in the terminating resistor math in the text trail
above, Ohms is obvious but how was the 3.5 Watt figure derived.

Back to the PFN purchased from Meredith for the SSY1. Of the pins
that are broken out, the labels seemed pretty clear but after looking
again, maybe not. Can anyone help me clarify their uses?

P1-1 White NC
Don't know

P1-11 Black NC
Don't know

P1-2 Green NC
Don't know

P1-6 Red/Yellow NC
Don't know

P1-3 White Logic Trig
Is this what the cap charger would use to fire the lamp when charged?

P1-9 Purple +900
Is this for the cap charger '+' voltage?

P1-13 Black GND
I this ground corresponding to P1-9 Purple +900v?

P1-17 Orange NC
Don't know

P1-5 White Charge
Don't know

P1-15 White Charge
Don't know

I believe the FAQ stated that K1 was the cap drain relay/switch. If
this is the case, does taking P1-3 to ground (P1-13) manually fire the
lamp?

-W

.

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