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The Blast Box
Ever want to really make yourself be heard? Ever talk to someone on the
phone who just doesn't shut up? Or just call the operator and pop her
eardrum? Well, up until recently it has been impossible for you to do
these things. That is, unless of course you've got a blast box. All a
blast box is, is a really cheap amplifier, (around 5 watts or so)
connected in place of the microphone on your telephone. It works best
on model 500 AT&T Phones, and if constructed small enough, can be placed
inside the phone.
Usage
Once you've built your blast box, simply connect a microphone (or use
the microphone from the phone) to the input of the amplifier, and
presto. There it is. Now, believe it or not, this device actually
works. (At least on crossbar.) It seems that illinois bell switching
systems allow quite a lot of current to pass right through the switching
office, and out to whoever you're calling. When you talk in the phone,
it comes out of the other phone (again it works best if the phone that
you're calling has the standard western electric earpiece) incredibly
loud. This device is especially good for PBS Subscription drives.