[AMPS] AL1500

[Ian White, G3SEK]

2 wrote:
>
>>
>>2 wrote:
>>>>>Thus, when the wolf comes to the door with 40 or so
>>>>>amperes, the transistor shorts and does not interrupt the flow of grid
>>>>>current in time.
>>>>
>>>>We're still waiting for a specific reference to the circuit that has
>>>>this design flaw.
>>>>
>>>There is no one circuit that has this flaw.  There are several.  I have
>>>never seen an 8877 grid-I-trip ckt that used a >2a transistor.  If you
>>>know of one, please enlighten.
>>
>>I know of no grid current monitoring circuits that behave as you
>>describe - that's my point.
>>
>//  Some Alphas apparently C-E-short their interrupt transistor.
>
That's not very specific... and what exactly do you mean by an 
"interrupt transistor"?

>>This ball has been in your court for some months, Rich. If there are
>>"several" such circuits, you'll have no difficulty in naming at least
>>one.
>>
>//  If grid-overcurrent protection circuits worked I would not be seeing
>kaput 8877s with loose gold about.

So you do have difficulty in naming even one specific circuit, then?

-- 
73 from Ian G3SEK          Editor, 'The VHF/UHF DX Book'
                           'In Practice' columnist for RadCom (RSGB)
                            http://www.ifwtech.com/g3sek

--
FAQ on WWW:               http://www.contesting.com/FAQ/amps
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com