Basic operation seems to be that the device is wired between permanent ground and switched ground. When the switched ground is released (door closed) the big transistor is biased into conduction and carries the lamp current. I think this bias must initially come through the 5K6 resistor and mumble mumble mumble keeping the second transistor biased on. Over time the cap charges through the 390K resistor and that magically via the diodes operates on the second transistor to operate and shut down the first one, which in turn shuts off the big guy. Yrs, d On Sat, Aug 5, 2017 at 2:48 AM, David Beierl <dbeierl@attglobal.net> wrote: > The 390K resistor has to be the timing resistor. Both diodes and that > resistor appear to be connected to the positive side of the cap. > > |
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