Re: Another H1812 source

The HV diode can be tested with a DC power supply (even a wall adapter
of
at least 12 or 15 V output), series resistor (to limit current), and
your
multimeter. This will determine proper behavior, at least at low
voltages.

The following is the schematic of a simple HV diode tester:

                 240 ohms, 1 W
       + o-----------/\/\---------+------------o +
                                  |
                                __|__ HV Good: 6 to 10 V
     15 VDC _\_/_ diode Shorted: 0 to 2 V
                                  | Open or reversed: 15 V
                                  |
       - o------------------------+------------o -

The voltage drop in the forward direction should be at least 6 V with a
few
mA of current but may be somewhat higher (8 V or more) with a few
hundred mA.
If your DMM or VOM has a resistance scale operated off a battery of at
least
6 V, you may get a reading in one direction (but only one) without the
need
for an external power supply.

----------------

Hope the ascii graphic turns out this time..

Mark E Davidson wrote:

> I think this has been answered before.. But is there a way to bench
> test these HV diodes?
>
> -=Mark=-
>
> peter jones wrote:
>
>> -----Original Message-----
>> From: "Mills, Lewis" <;lmills@mail.state.mo.us>
>> To: "'vectorlist@synthcom.com'" <vectorlist@synthcom.com>
>> Date: Tue, 16 Jul 2002 15:19:55 -0500
>> Subject: VECTOR: Another H1812 source
>>
>>
>> > Hi all,
>> > 4Star Electronics (http://www.4starelectronics.com/) shows they
>> > just got 400
>> > of these in stock at the end of June. They want $29.75 each in
>> > quantities of
>> > 10. The guy at 4Star says "There are only two people in the world
>> > that have
>> > these parts!" I say start hoarding!
>> > Lewis,
>> > the guy sitting on the last four SK7330s in the world
>> >
>> >
>> AT THOSE PRICES HE CAN SHOVE THEM!
>>
>> what's the big deal anyway?
>>
>> i can get high-voltage diodes easy, just askk in any (old) tv repair
>> shop.
>> these places have stuff stashed away that is older than the
>> staff!!!!
>>
>> another idea to try - for the adventurous,
>> cutting the HV diode-pack out of dead Line-output transformers!
>> (another use for the hobby-drill and cutting disks !!!)
>>
>> remember - as long as there are CRT's and lasers (and
>> x-ray/microwave systems)
>> there will always be sources of high-voltage rectifiers.
>>
>> c.u.
>>
>>
>> ------------------------------------
>> Mail.Ru - óäîáíî, äîñòóïíî, íàäåæíî!
>> ------------------------------------
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>> .
>>
>>

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Received on Sat Jul 20 15:47:38 2002