Jorge,
If you measure total current then you will not be able to reduce to zero.
If you put a meter only to final stage then
the current control will be effective.
My board came with ~150mA in the final stage IRF.
Raj
At 05-01-2017, you wrote:
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?
???? ??? Thanks Raj but I can not
adjust the 50 mA at rest, something is wrong yes!
???? ???? Jorge
2017-01-04 13:47 GMT-02:00 Raj
vu2zap@... [BITX20]
<BITX20@...
>:
- ????
- Jorge,
- This is normal. As the final IRF warms up the current increases. Do
not worry!
- At 04-01-2017, you wrote:
- ????
- ?????? ?????? Hello Raj, my BITX20
V3 Linear is consuming 155mA I think a lot, what will be happening? Maybe
the auto FET flickering?
- ?????? ?????? ?? Jorge PY2PVT
_._
- 2017-01-04 10:11 GMT-02:00 Raj
vu2zap@... [BITX20]
<BITX20@...
>:
- ??????
- For anyone trouble shooting the final stages.
- Measured these voltages without any modulation
- Power supply exact 12V, PTT pressed/shorted
- Predriver Q13 drawing 30mA
- C=11.6
- B=3.66
- E=3.0
- Driver Q14 drawing 41mA
- C=11.85
- B=1.0
- E=0.415
- Final Q15 drawing 150mA
- C=12
- G=4V
- E=0
- --
- ?????? 73 de Jorge PY2PVT
- ?????? Campinas SP
- ?????? GG67MD
--
???? 73 de Jorge PY2PVT
???? Campinas SP
???? GG67MD
Raj vu2zap