Diy a Telephone (analog) conversation recorder adapter - Help

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r2d2

Well-known member
Joined
Jan 16, 2011
Messages
614
Location
A-rea 51
Hello everybody

looking for info schematics etc....

for build an "impedance/amp" analog audio adapter , for record telephone conversations
with an analog or digital recorder with 10k line input

tanks in advance for any help !

peace
r2d2
 
Or telephone conversation recorder circuits.

Few here;

http://schematicwiring.com/simple-electronic-applications/simple-telephone-recorder-circuit-schematic-diagram/
 
r2d2 said:
for build an "impedance/amp" analog audio adapter , for record telephone conversations
with an analog or digital recorder with 10k line input
Click to expand...
The conversation is available on the two-wire system. You need three things: a transformer, which will provide galvanic isolation between the DC-powered line and your equipment, a capacitor between the two-wire line and the transformer's primary, and a volume control (potentiometer). You don't need a hybrid; a hybrid is for isolating the incoming and outgoing signals, which is not your requirement.
 

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  • telephone eavesdrop.jpg
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FYI you can buy quite fancy ones second hand for about £50. Search for "Gentner ap10"  These have built in echo cancelation / limiters etc.
 

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