Hello:
Years ago in one of the British ham magazines there was a circuit where you
discharged the reservoire cap in the hv with a thyristor that was in
paralell. When there was flash-over in the pa tube ( valve hi!) you got a
pulse that fired the thyristor. You just insert the lead to the anode
through a big coil with many turns. The coil ignites the thyristor
discharging the cap. Maybe you have to insert a current limiting resistor in
series with the thyristor?
73s de Hans
----------
>Från: "Steve Thompson" <rfamps@ic24.net>
>Till: <amps@contesting.com>
>Ämne: Re: [AMPS] Testing HV Psu
>Datum: tis 29 aug 2000 09.40
>
>
>
>-----Original Message-----
>From: Steve Eldridge <steve@g8izy.freeserve.co.uk>
>To: amps@contesting.com <amps@contesting.com>
To: <amps@contesting.com>
>Date: 28 August 2000 21:40
>Subject: [AMPS] Testing HV Psu
>
>
>>
>>Hello All,
>>
>>I am nearing completion of a new HV psu. This time, I am doing the job
>>properly with due regard to safety and reliability.
>>
>>My question is : Is there a "tried and trusted" way of introducing a
>>dead short-circuit across the supply, preferably repeatedly- apart from
>>shorting with the proverbial screwdriver!
>>
>>I am considering making a well insulated "knife switch", with the earthy
>>side to the handle (and the hinge supplemented with copper braid) behind
>>a clear plastic screen. Unless there are some better suggestions....?
>
>
>Plastic tweezers, rubber gloves and goggles perhaps?
>
>Somewhere on their site, Svetlana recommend a size and length of wire which
>should not burn out in such a test for a 800/1500W valve.
>
>Steve
>
>
>--
>FAQ on WWW: http://www.contesting.com/FAQ/amps
>Submissions: amps@contesting.com
>Administrative requests: amps-REQUEST@contesting.com
>Problems: owner-amps@contesting.com
>
>
--
FAQ on WWW: http://www.contesting.com/FAQ/amps
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|