G gjpollitt New Member Jun 30, 2004 #1 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
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 Active Member Jun 30, 2004 #2 This is only a coil with about 5000 turns 0.05mm enameled copper wire.
G gjpollitt New Member Jun 30, 2004 #3 thanks but i am looking for the whole schematic so i can buy the bits and build it
L ljcox Well-Known Member Jun 30, 2004 #4 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
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 Super Moderator Most Helpful Member Jun 30, 2004 #5 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.
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 New Member Jul 1, 2004 #6 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.
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.