Laser Burglar Alarm -- Need Help

[john1]

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 ... ?

 

[Anonymous321]

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 ... ?

Wait! Not yet, please! Did you see my post from above?

 

[john1]

hard to gauge sizes ...
will the resistor 33K reach from number 1 terminal
to number ten terminal ... ?

Just to touch it on while holding it.

 

[john1]

dont worry,
battery not on yet ...

 

[john1]

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

 

[Anonymous321]

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

Ok, please hold on while I open the package for the 33k. Sorry for taking so long.

 

[john1]

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

 

[john1]

you might have to re-position the connections on No 10
to go on No 6

 

[Anonymous321]

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

Yeah, I understand. I'm really sorry for keeping you up. Ok, so I have the 33k. Orange, orange, orange, gold stripes.

 

[john1]

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

 

[Anonymous321]

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

I changed +ve of siren to number 6. And have resistor going from base to +ve of siren (1-6).

 

[Anonymous321]

So you said to introduce some current through its base? How so? Have a wire from +ve of 9V to base?

 

[john1]

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 ?

 

[Anonymous321]

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 ?

Yes, it will. But let me get this straight:
You want me to:
- have a wire from +ve of 9V to base
- +ve of 9V to No 6
- resistor to be able to touch 1 and 6 but not actually fitted in spring
Is that correct?

 

[john1]

Not Quite.

 

[Anonymous321]

Not Quite.

What's the error?

 

[Anonymous321]

John, are you there?

 

[john1]

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.

 

[john1]

alright so far ?

 

[Anonymous321]

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.

Ok, and what about the Base to 1 and then 1 to +ve of 9V?