HL2 PA Fets

Mike W

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Mar 10, 2025, 12:43:42 PMMar 10

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Does anyone know where I can obtain some HL2 output FETS, AFT05MS003 and
pre-driver OPA2677.
thanks Mike G8NXD

Evan Hand

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Mar 10, 2025, 1:36:32 PMMar 10

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Mouser and DigiKey both carry them

73

Evan

AC9TU

Steve Haynal

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Mar 12, 2025, 12:08:14 AMMar 12

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There is a substitute for the AFT05MS003 since it is no longer available. Please search this group for the details of that change:

https://groups.google.com/g/hermes-lite/search?q=AFT05MS004N

73,

Steve

kf7o

Mike W

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Mar 19, 2025, 3:29:42 AMMar 19

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On 18/03/2025 09:00, Mike W wrote:
> No help from the list, Steve.
>
> I have replaced the burnt 270R PA resistor (R92) and the other side
> 270R resistor (R99).
> When I adjust the Bias up from 0.
> Bias 0 is unmoving at 3.5mA, Bias 1 rises to about 60mA and then jumps
> to over an amp. I imagine this is parasitic oscillation.
>
> voltages appear correct.
> My best guess is Bias 0 refers to Q3 and Bias 1 refers to Q4 and that
> Q3 (R92) is dead and Q4 does'nt like Q3 the way it is.
>
> How do you view this ?
>
>
>
>

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