Help Identifying Components

Rob Jarratt robert.jarratt at
Sun Dec 24 15:00:15 CST 2017

> >
> > My guess is capacitors also.
> Noting they are paralleling resistors, they're probably just noise/AC
bypass, on
> the order of 0.01 uF, and not overly consequential to understanding the
> circuit.
> Again, one can draw it out with the above presumption and then assess
> whether it makes sense or for alternative functions.
> > This "SMD Code Book"  should be of some value:
> >
> >
> >

I am indeed drawing it out. Whether I have drawn it logically or not I am
not sure. I will check it with reference to the main input stage of the PSU,
where this board has come from. Could the reference be associated with the
input voltage auto-sensing? Or is this overly elaborate for that purpose?

That unmarked flat part does appear to have some resistance, about 390ohms
as measured in circuit, so probably the precision trimmed resistor you



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