Hi, I have to build a telephone handset amplifier which has to amplify both the speaker on the ear (incoming sound) and the mic (outgoing voice). It has to be powered by 3xAA/AAA batteries or 1x9V battery.
Charles ( snipped-for-privacy@comcast.net) ha scritto:
::: Hi, I have to build a telephone handset amplifier ::: which has to amplify both the speaker on the ear ::: (incoming sound) and the mic (outgoing voice). ::: It has to be powered by 3xAA/AAA batteries ::: or 1x9V battery. ::: ::: Can you please suggest me a tested scheme? :: :: Sure. Use amplifiers. Homework?
Homework? Absolutely not. I need an amplifier for the telephone because my parents are becoming deaf.
Then you don't need a microphone. Their voices aren't getting weak, it's their hearing.
Check with your telephone company. They may still offer telephones with built in amplifiers for those with hearing loss.
Find a local support group for those with hearing loss, and likely they can point you to local commercial products. Little amplifiers that fasten over the telephone receiver, and amplify the incoming sounds, just what they need.
Or got to a hearing aid dealer, and ask them about such products.
If they are losing their hearing, they likely would benefit from hearing aids, which work for everything. Many/most hearing aids include an inductive coupler, precisely for use with telephones (it picks up the signal from the telephone receiver but the hearing aid stays in place to amplify the signal and do the desired frequency shaping). Though, I have the impression that at least some third party telephones nowadays may use a transducer for the receiver that has no inductive field to use with those inductive pickups. Either that, or they aren't as well designed as traditional phones, so the layout is not optimum for inductive pickup.
Some telephones now are designed for use with headsets, so I gather. That makes it really easy to insert a small audio amplifier between the output of the phone and the headphone(s) in the headset.
Michael Black ( snipped-for-privacy@FreeNet.Carleton.CA) ha scritto:
:: Some telephones now are designed for use with headsets, so I gather. :: That makes it really easy to insert a small audio amplifier between :: the output of the phone and the headphone(s) in the headset.
Michael A. Terrell ( snipped-for-privacy@earthlink.net) ha scritto:
::: Thank you, but it's too expensive (20£ -> 30EUR -> 40$). ::: It costs more than the phone! ;-) :: :: :: Your parents aren't worth the $40? Shame on you.
I have a lot of components and If I find a good scheme then I can build a device like that.
But people did provide him with a variety of schemes. He refused at least some of them. But if he doesn't have a scheme in the first place, he's hardly ready for a schematic.
Though actually "schematic" derives from "scheme".
Michael Black ( snipped-for-privacy@FreeNet.Carleton.CA) ha scritto:
:: But people did provide him with a variety of schemes. :: He refused at least some of them. But if he doesn't have :: a scheme in the first place, he's hardly ready for a schematic. :: :: Though actually "schematic" derives from "scheme".
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