Would like to modify a schematic i found

[xerces]

Hi i looking for some help with modifying a schematic i found fo a simple micro transmitter/receiver i found.

http://talkingelectronics.com/projects/Spy Circuits/SpyCircuits-1.html

all the info i am referring to is on page one, i would like to know if i would be able to switch out the 9v battery with a battery for a hearing aid, and if a stronger speaker is recommended or not. the range that i'm looking to achieve is between 25ft-30ft (8-10 meters). also if it is possible would you happen to know about how long the battery would last and on average when i should replace it. these are the modifications that i'm looking for but if you see any room for improvement please let me know. any help is well appreciated. Thank you in advanced

 

[davenn]

there's a whole bunch of 9V ones there .... specifically which one did you want to modify??

and why ??
since there's a whole bunch of 3V ones there as well, just use one of those ccts

smaller type battery is going to significantly reduce its operating time

Dave

 

[upand_at_them]

A hearing aid battery may not even be able to supply enough current to operate. And if it could the transmitting range would be very short, like maybe a meter or two. I would say no.

 

[xerces]

there's a whole bunch of 9V ones there .... specifically which one did you want to modify??

and why ??
since there's a whole bunch of 3V ones there as well, just use one of those ccts

smaller type battery is going to significantly reduce its operating time

Dave

My mom is constantly losing this one trinkets that my farther left her so I was going to try to help her not lose it

 

[BradtheRad]

There are inexpensive 'lost item locator' gizmos available. Frequently used to attach to your keychain.

Some beep when you press a radio control unit. These are more expensive.

Others beep when you whistle a certain pitch, or sequence of tones. You need to be at a close distance for this type to work.

 

[xerces]

There are inexpensive 'lost item locator' gizmos available. Frequently used to attach to your keychain.

Some beep when you press a radio control unit. These are more expensive.

Others beep when you whistle a certain pitch, or sequence of tones. You need to be at a close distance for this type to work.

I've look at all those and none are small enough. The space I have to work 2" x1/4" x1/8"

 

[davenn]

I've look at all those and none are small enough. The space I have to work 2" x1/4" x1/8"

well you are not likely to build one smaller than the commercial ones unless you are an electronics whiz with access to a well equipped RF design workshop and the knack of Japanese miniaturisation

Dave