Measure across first hole(gate pin) and third hole(source pin) where the fets will go. Also, on P1 side, measure from ground to top of Led. This would be the right side of the 10K resistor directly above it. On the P2 side, measure from negative rail to top of Led. THis would be left side of 10K resistor directly above it.
just temporary for testing Antoinel
measurements above are from gate to source
will check the others now
cheers Sheafer
measurements above are from gate to source
will check the others now
cheers Sheafer
Both Leds should provide 1.8V for Vref. You can measure directly across them if you have access to the bottom of the boards. Did you jumper unused LEd spots?
worked it out
the daughter board on the faulty channel is around the wrong way ,the worst part is I soldered it in as I never planed on messing with transformers !!!!!
now I have to get the bloody thing off some how
I can see many hours with solder wick in my hands
Sheafer
the daughter board on the faulty channel is around the wrong way ,the worst part is I soldered it in as I never planed on messing with transformers !!!!!
now I have to get the bloody thing off some how
I can see many hours with solder wick in my hands
Sheafer
The interface to the transformer's secondaries was blurry and unclear in the above post. The top part of the attached picture shows 2 options. The right option is the one which was blurred; e.g. for the P channel L'Fake SIT. I figured the 33K2 resistor in wrenchone's parent schematic introduced a needed [sizeable] impedance to the input signal. The top left scheme is simple and may not need the 33K2 altogether to generate the current source which is modulated by the input signal.
The bottom portion of the attached picture is a simplified variant of lhquam's Teaser F6cc. The Schade/Pass feedback schemes in wrenchone's methodology above are equally adaptable in this case. The added [emphasized] components are 2 DC blocking caps and one feedback resistor. This arrangement is expected to convert the amp's original pentodish characteristics to the desired triodish characteristics via this SIT faking process.
The bottom portion of the attached picture is a simplified variant of lhquam's Teaser F6cc. The Schade/Pass feedback schemes in wrenchone's methodology above are equally adaptable in this case. The added [emphasized] components are 2 DC blocking caps and one feedback resistor. This arrangement is expected to convert the amp's original pentodish characteristics to the desired triodish characteristics via this SIT faking process.
