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Boss BR600, digital recorder, 2006

Discussion in 'Electronic Repair' started by N_Cook, Jul 11, 2013.

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  1. N_Cook

    N_Cook Guest

    Boss BR600, digital recorder, 2006
    Q47 an 8pin SMD presumably a powerFET switch, with an erupted hole in
    it. Marking
    BB
    ??F1
    probably ?? as 1 or 2 missing characters
    3 connected pins of the IC go to batt -ve, single pin via R2 a fusible
    resistor of .3R to batt +ve (9V), and 4 pin combination on to the rest
    of the circuit via the on/off switch.
    Quite a bit of space to fit something bigger than the original, but what
    sort of rating or identity and then data for a BB??F1 top code SMD ? So
    far not found an 8pin BB powerfet identity

    further reading
    http://www.thegearpage.net/board/archive/index.php/t-508133.html
    but no identity of the powerfet,
    www images swamped with external views of course and 1 out of focus pic
    of the diode fudge in the above thread
     
  2. N_Cook

    N_Cook Guest

    Ta for that
    Dual p-ch 3A,30V, buried in the datasheet Marking: BB
    With the ex-SOIC off the board then traces are consistent with the
    pinout of that IC with both devices paralleled
     
  3. N_Cook

    N_Cook Guest

    I was going to put an IRF9532 in there as plenty of space for a TO220
    but I've no idea what the seriesing is all about so a couple of
    paralleled shottky SM diodes went in at D2 pads, reassembling/testing
    next week.
     
  4. N_Cook

    N_Cook Guest

     
  5. N_Cook

    N_Cook Guest


    Talking to an engineer familiar with solar PV controls. He was reminded
    of the anti-shadowing bypass "diodes" in solar panels. Otherwise a
    shadow over as little as one cell will kill the output of the whole
    array, so as little as a good dollop of seagull shit is all that is
    required. Say 50 cell panels and each sector of 5 can be bypassed by one
    of these 2pin powerFET devices built into each panel , output falls in a
    sector below a trigger level and "diode" kicks in bypassing the 3amps or
    so of the rest of the array but only dropping .05 volt, so overall array
    efficiency drop of 1% instead of 90% or whatever with the shadow of a
    chimney or telephone pole or whatever.
     
  6. N_Cook

    N_Cook Guest

    back working again
     
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