7.5V
It is not there to regulate, but to limit in case of something bad
happening, while allowing the gate of the FET to get the full control
voltage for T/R switching. The zener normally is not conducting.
73,
Lyle KK7P
On Wed, Aug 17, 2022 at 12:08 PM RALPH TURK wrote:
> The real question
The real question is/was what value of zener.
> On 08/17/2022 9:45 AM Andy Durbin wrote:
>
>
> "The latest revision of the schematic for the KPA500 TR Switch shows a Zener
> diode at the gate of Q4 in place of R3, the 100K resistor previously."
>
> What is the latest revision? I have Rev D
"The latest revision of the schematic for the KPA500 TR Switch shows a Zener
diode at the gate of Q4 in place of R3, the 100K resistor previously."
What is the latest revision? I have Rev D which is later than any I have found
on-line but it shows R3 not a Zener.
Andy, k3wyc
The latest revision of the schematic for the KPA500 TR Switch shows a Zener
diode at the gate of Q4 in place of R3, the 100K resistor previously. Its
obviously for gate protection. There are no markings on the schematic what
this diode is although the spec sheet for the IRFSL9N60APBE does say
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