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Registered Member #1107
Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
Hi. I recently bought a dutchtronix oscilloscope clock kit and i want to interface it with my own crt. this is the tube that i want to use I am looking to find the best way to get the needed voltages and the best way to drive it for an x/y display. I have a 6.3v heater transformer but i still need a way to get the 130 and 1200v for the 2 anodes. Once i find that then i need to make a simple deflection amplifier circuit that connects to the x and y outputs on the clock module. Any help would be appreciated.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Oddly enough, I have just built a 130V DC PSU from readily available parts.
I have joined in series the dual secondaries of an 18VA 0-48V 0-48V PCB transformer to provide 96V RMS to a bridge rectifier, thus generating 135V pk on a reservoir capacitor of 1000uF/200V wkg. I have followed this with an LF choke (in fact the primary of another PCB transformer) and a second 1000uF/200V wkg. capacitor to create a nice little 130V supply for my experiments with using ordinary (i.e. cheap!) HF pentodes as electrometer valves.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Harry wrote ...
I have joined in series the dual secondaries of an 18VA 0-48V 0-48V PCB transformer to provide 96V RMS to a bridge rectifier, thus generating 135V pk on a reservoir capacitor of 1000uF/200V wkg.
Sorry for OT, but I often see e.g. "200VW" rating on a cap, is this the "wkg" you're talking about, and what does it mean?
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Dr. Kilovolt wrote ...
Harry wrote ...
I have joined in series the dual secondaries of an 18VA 0-48V 0-48V PCB transformer to provide 96V RMS to a bridge rectifier, thus generating 135V pk on a reservoir capacitor of 1000uF/200V wkg.
Sorry for OT, but I often see e.g. "200VW" rating on a cap, is this the "wkg" you're talking about, and what does it mean?
VW = volts working = working voltage = wkg. - mine is an old fashioned British notation, perhaps.
Registered Member #1107
Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
Ok back on subject. yesterday i played with some rewound ferrite transformers running at 20khz and i got some nice results. 1st of all i took a transformer and wound 10 primary turns so i can achieve a easily calculatable volts per turn ratio. With 5 secondary turns i got 70v and when rectified with a filter cap, then 130vdc for the 1st anode. I still have to figure out how to get a little more current though. Now i am going to wind a 850v winding so when rectified it gives me 1190v. That is pretty darn close to what i need. I will keep updated with how it is going. Any tips or help would be appreciated.
Registered Member #1107
Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
Ok when i try to increase the frequency i get almost no voltage what so ever. I also wound a high voltage winding for the 2nd anode but im getting lots and lots of voltage back into my power supply and i am really afraid i will blow something out. Why is this doing this?
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crt power supply and defelection amps
