Search found 36 matches

by Chris Giles
Sat Jan 26, 2019 8:51 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: 50kV Supply
Replies: 24
Views: 2035

Re: 50kV Supply

Thanks Rex. That is most helpful, particularly the manual. The other manuals I have found have been similar but that one is exactly the right model (board part number matches). Looks like a complete unit could be re-created but would be quite a fiddle.
by Chris Giles
Fri Jan 25, 2019 10:34 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: 50kV Supply
Replies: 24
Views: 2035

Re: 50kV Supply

Thanks very much Joe
by Chris Giles
Fri Jan 25, 2019 10:07 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: 50kV Supply
Replies: 24
Views: 2035

Re: 50kV Supply

Please could someone let me know if these units come with the High Voltage transformer or are just the HV multiplier? I can't find the pic which Joe posted of it(?). I found the pics which Andrew S posted of a similar complete unit here and that has the HV transformer on the main PCB, not cased with...
by Chris Giles
Fri Jan 25, 2019 9:54 pm
Forum: The Trading Post
Topic: Looking for: Controller Panel for Spellman-Bertan PMT power supply
Replies: 24
Views: 1783

Re: Looking for: Controller Panel for Spellman-Bertan PMT power supply

That ("50kV Supply") is not a Spellman unit
ah.. sorry, my mistake. Easy to confuse especially when they have such a similar range of products! I have found that some of the Glassman Instruction Manuals are Google-able and contain at least partial schematics.
by Chris Giles
Tue Jan 22, 2019 10:26 pm
Forum: The Trading Post
Topic: Looking for: Controller Panel for Spellman-Bertan PMT power supply
Replies: 24
Views: 1783

Re: Looking for: Controller Panel for Spellman-Bertan PMT power supply

Thanks Harald! It's nothing really :) You just need to know what the abbreviations written on the case mean. All the old industrial parts we come by on eBay seem to need the same type of detective work! I hope someone explains the connections to the Spellman unit described in this thread which does ...
by Chris Giles
Sat Jan 19, 2019 11:24 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: 50kV Supply
Replies: 24
Views: 2035

Re: 50kV Supply

All true. Excellent work! I appreciate Richard's comment about the diodes not being a limiting factor and also that Spellman would have been designed to have a very low % ripple which is not necessary. Given it is a charge pump circuit i think the factor determining how much power it can supply is ...
by Chris Giles
Sat Jan 19, 2019 10:09 am
Forum: The Trading Post
Topic: Looking for: Controller Panel for Spellman-Bertan PMT power supply
Replies: 24
Views: 1783

Re: Looking for: Controller Panel for Spellman-Bertan PMT power supply

You are welcome Harald. One final thing - as it says the input impedance is 100k, a 10k pot would be better to use - I shouldn't have said to totally ignore that figure! The reason is that if a 100k pot is used then the input impedance (pin 8 to ground) is significant when paralleled with it and you...
by Chris Giles
Fri Jan 18, 2019 8:35 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: 50kV Supply
Replies: 24
Views: 2035

Re: 50kV Supply

EBay listing ... is only the high frequency transformer and multiplier section .. although these parts are hard to find, constructing a complete PSU from this is not an easy path for most. It requires quite significant expertise and working with dangerous voltages even on the "low" side. This post ...
by Chris Giles
Fri Jan 18, 2019 7:50 pm
Forum: The Trading Post
Topic: Looking for: Controller Panel for Spellman-Bertan PMT power supply
Replies: 24
Views: 1783

Re: Looking for: Controller Panel for Spellman-Bertan PMT power supply

Hi Harald OK, then you connect a potentiometer as it says on the case: Pin 10 CW - clockwise, Pin 8 Wiper (centre pin) Pin 7 CCW - counter clockwise 10k to 100k would do fine. Use a linear track. There is very low current on these wires, so use as thin as you like. and what use are these supplies bi...
by Chris Giles
Fri Jan 18, 2019 3:29 pm
Forum: The Trading Post
Topic: Looking for: Controller Panel for Spellman-Bertan PMT power supply
Replies: 24
Views: 1783

Re: Looking for: Controller Panel for Spellman-Bertan PMT power supply

Hi Harald, Z is the standard abbreviation for impedance. In this case you can treat that as resistance because it is DC current. Don't worry about it. Please first decide if you will be using the internal pot, voltage control or an external pot. The specs you refer to tell you about the external vol...