Laser Burglar Alarm -- Need Help

john1 said:

Briefly,
the transistor starts in the off position (not conducting)
until some current through its base will allow it to conduct E to C
so all is well so far.

Now to allow it to conduct we will introduce some current through its base.

Okay ... ?

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john1 said:

you mean the wattage .. ?
just use the one with the longest legs.
i don't think we will be driving it hard.

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john1 said:

Thats Ok,
but its late here, i will have to go to bed after a while.

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john1 said:

will it touch on both No1 and No 10 at the same time,
with you holding it ?

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john1 said:

And also i hope the battery wire + to No6.
please remove the resistor,
as we only want to touch it across from 1 to six,
briefly, to see what reading we get.

Will it touch across easily with you holding it ?

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john1 said:

Not Quite.

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john1 said:

No error really, just should be same as before,

pos of 9v to No6,
pos of siren to No 6,
Neg of siren to No11,
Collector to No 2 and across to No 11,
Emitter to No3 and over to neg of 9v.

really, same as before, but using 6 instead of 10

Okay?
So really no change at all, so far.

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