Hi,
Those of you having trouble with audio noise from Gamma HPS 1A Psu the
following from the manufacturers:--
Some of our production units were shipped with slight instability in the
switching power supply control loop. A surface mount resistor needs to be
changed to a new value. If you have access to 0805 resistors and tools to
replace them on printed circuit boards, you will need to access the bottom of
the switching power supply PCB and change resistor R25 from 2000 ohms to 2700
ohms. This will stop the high pitched sound.
They are very apologetic and hope its works
73 Paul G3SEM
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