Magnetic Acoustic Audio Pickup schematic wanted

[gjpollitt]

Anyone have the above?

Ive seen a magnetic pickup which can be placed on an audio transformer which amplifies and plays the sound through a speaker

I need this for listening to dtmf tones on a system i work on

thanks

 

[Sebi]

This is only a coil with about 5000 turns 0.05mm enameled copper wire.

 

[gjpollitt]

thanks but i am looking for the whole schematic so i can buy the bits and build it

 

[ljcox]

All you need is the coil mentioned by Sebi (or one taken from a transformer or inductor) and an audio amplifier to amplify the signal.

Len

 

[Nigel Goodwin]

At one time you could buy the coils from Tandy (the long defunct UK version of Radio Shack), they had a rubber sucker on the side for attaching to a phone.

 

[evandude]

https://www.radioshack.com/product.asp?catalog_name=CTLG&product_id=44-533

might not help you much in the UK, but maybe you can find something comparable someplace else.