R
Ray
Just spent many hours today pinpointing a faulty tantalum capacitor.
It was in the display board of the SC Deep Cycle battery charger.
The charger would run for about 5 minutes, then slowly the 5V rail to
the PIC would slowly drop to 3.5V or so and everything would stop,
obviously.
If they used a simple 7805 regulator, without a series input resistor,
the blue smoke would have been released and made the fault finding far
easier
In this instance, obviously (now) the cap began leaking more the longer
volts were applied.
Ray
It was in the display board of the SC Deep Cycle battery charger.
The charger would run for about 5 minutes, then slowly the 5V rail to
the PIC would slowly drop to 3.5V or so and everything would stop,
obviously.
If they used a simple 7805 regulator, without a series input resistor,
the blue smoke would have been released and made the fault finding far
easier
In this instance, obviously (now) the cap began leaking more the longer
volts were applied.
Ray