P3D Re: PHOTO-3D digest 2838

[Peter Homer <P.J.Homer@xxxxxxxxxxxxx>]

               Low Ohms      High Ohms
>                      ___________________________
>       _______       /    |         |            |
>      |       |     /  ___|____   C |  _______   |
>      |Silicon|    /  |        |    |_|       |  |____>
>      |Solar _____/   | Small  |      |  SCR  |          TO FLASH
>      |Cell   | -     | Auto   |      |       |_______>
>      |       |       | Trans- |      | C106B | A
>      |       |-------| former |------|       |
>       -------  +      --------     G  -------
>
>Most small silicon solar cells should work. Most small audio transformers with
>a resistance of about 8 and 400 ohms should work. The SCR could be something
>equivalent but it should be able to handle 200 or preferably 400 volts between
>its A and C leads. Since a SCR is used the flash needs to connected to it the
>right way, meaning the SCR's output is polarized and it needs to match the
>input
>to the flash. If the flash does not fire with the connections wired one
>way try
>reversing them.

Note: I am guessing the "small auto transformer" in the diagram is a type.
I suspect it should have been "audio transformer"

 Actualy it may be a Auto transformer which is a type which when used with
the mains does not isolate from the mains . Instead of two coils seperated
from each  (apart from the magnetic field) I think it consists of just one
resistance coil or something like that in the circuit. The Fed projectors
that were available a while back adapted  for American 110/120 volt mains
used auto-transformers.
                                                              P.J.Homer



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