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Old 15th February 2003, 11:41 PM   #11
dhaen is offline dhaen  Europe
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IMO The best "relay" for this is a valve.

Cheers,
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Old 15th February 2003, 11:49 PM   #12
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Default BEAT ME.

Hi,

Quote:
IMO The best "relay" for this is a valve.
Yes...

And the I.Q. is going down lately....pffffrrrrhhh.

\signed HH style.
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Old 16th February 2003, 12:06 AM   #13
Gunders is offline Gunders  Norway
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Well.. here you have a schematic of the alternative....
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Old 16th February 2003, 12:16 AM   #14
dhaen is offline dhaen  Europe
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Frank,

I thought my reply was succinct.
Valves make very good relays, as do transistors. Exhibit 1: the computer I'm presently typing on.
But valves come in high voltages.

You could be right about the IQ. After all, I'm at one with the Belgian, French, German position over Iraq. And we all know that the "cleverest" people are American (with the Brits up their **** of course). After all, only stupid people don't want to go to war...
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Old 16th February 2003, 12:24 AM   #15
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It will work fine, but add a little trick to keep the spark from pitting your contacts. Add a .01 1KV cap between your contacts [top to bottom I assume] and a .001 1KV cap from bottom contact to ground to keep things from sparking. Maybe not the best setup but will work and with this voltage may not need it at all, better safe than replacing relays someday.
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Old 16th February 2003, 12:24 AM   #16
dhaen is offline dhaen  Europe
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Why not replace the relay with a valve with grid and cathode connected together?
OK it'll need it's own heater supply.
Tada... a delay. (If that's what's needed...)

Protel eh?
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Old 16th February 2003, 12:29 AM   #17
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Hi,



Quote:
It will work fine
Yep.

And I can write Chino too.


For crying out loud ,you don't have a clue what it's about .



Quote:
I thought my reply was succinct.
Yep.Yep.It was was.
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Old 16th February 2003, 04:15 PM   #18
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You can get a relay from P&B with 600VAC contact rating (T92 series - 10A@600V, 30A @240v...) for about $8-10 US from DigiKey or Mouser. It's an ugly black plastic case with mounting flanges and tab terminals, but you were going to hide it under the chassis anyway... right?
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Old 16th February 2003, 05:02 PM   #19
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Default in the kw ham amplifiers

they switch the ps primary -- actually DPDT and a safety interlock -- microswitch -- so that you can't engage the relay without the cabinet being closed.


i have seen the center tap of a transformer secondary switched in and out as "standby".
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Old 16th February 2003, 07:38 PM   #20
Gunders is offline Gunders  Norway
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Quote:
Originally posted by dhaen
Protel eh?
Yes, I use Protel for drawing schematics and PCB layouts, though I only use the Protel 99SE, I haven't got a crack for the Protel DXP version yet.
I know some of you don't like the PCB thing.

Back to the relays....
The conclusion is that it's ok for me to use a relay the way showed in the schemtic I posted as long as I add some protectioncapacitors?
Are there other thing I should be aware of while using relays in high voltage circuits.

And the thing about using vacuumtubes instead of a relay, I don't quite understand.
Wouldn't there be a quite large voltage drop over the tube, and how much current can I accept through this tube??

Quote:
Originally posted by jackinnj
I have seen the center tap of a transformer secondary switched in and out as "standby".
Yes, I have also seen switches connected to the centertap, but unfortunately my transformer don't have a centertap.
But wouldn't it be a problem to use 'normal' switches in high voltage circuits too??
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