Here's Another Way To Have Fun With Sound: Several Years Ago, A Friend Who Manages A Large Retail Store Gave Me An Electronic Bird Call Used To Add "realism" To Store Displays.

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Here's another way to have Fun with Sound:

Several years ago, a friend who manages a large retail store gave
me an electronic bird call used to add "realism" to store displays. This
device was about 4 inches in diameter and 2 inches high, with a speaker
on the top. It was powered by a 9-volt battery, and had two controls:
a 5-position "voice" selector, and a time delay control to set the
interval between calls (up to 60 seconds).
For a device which used just discrete transistor circuitry, the
bird calls were amazingly realistic - especially if the time interval was
long between calls.
I have had much fun with this gadget, especially planting it in
people's houses (basement and garages are good places). The unsuspecting
victims really believe that there is a bird trapped in their house - and
go ape trying to find it.
If anyone wants one of these devices, they can be purchased from
any company which sells retail store display fixtures; I don't believe they
cost much money.

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