And here's the schematic: https://goo.gl/photos/mcHajDYPoanHXZbe8

Yrs,
d

On Sun, Aug 6, 2017 at 8:48 PM, David Beierl <dbeierl@attglobal.net> wrote:

> Hokay, here's how it works.  Components are numbered left to right and top
> to bottom in Dick's photo of the component side of the board.  Red wire (+)
> goes to switched ground, black wire (-) to unswitched ground.
>
> When door is closed, + lead is pulled up toward V+ through the lamp.  Q2
> base is pulled up through R1 5K6.  It is biased into conduction and its
> emitter pulls up the base of Q1, the big guy, biasing it into conduction
> and limiting the voltage across it to call it a volt, thus lighting the
> lamp.
>
> At the same time, C1 begins to charge through R2 390K.  Its + side is
> connected to Q3 base through D1, so once the cap voltage reaches 0.6 or so
> it pulls up Q3 base and Q3 begins to conduct.
>
> Q3 emitter is grounded and collector is connected to the + bus through R1,
> the same resistor that's biasing Q2 base positive.  When it conducts it
> pulls Q2 base down, shutting off Q2 which in turn shuts off Q1 and stops
> the music.  C1 continues to charge and eventually reaches V+.
>
> When the door is opened, C1 immediately drains down to about 0.6V through
> D2, resetting the circuit for the next delay.
>
> Yrs,
> d
>
>
>
> On Sun, Aug 6, 2017 at 3:36 PM, Alistair Bell <albell@shaw.ca> wrote:
>
>> Hi Dick,
>>
>> Your delay module is pretty well perfect. If you can't get it working
>> again there is my banggood substitute. I've made a video showing it mocked
>> up, set for 12 second delay on the relay.
>>
>>