Tony,
I'm not familiar with the ISD4004, but I've connected two different RC Systems speech boards to mobile phones. Both times I used a 1:1 audio transformer, as some of the amplifier chips don't...
Type: Posts; User: b1arrk5; Keyword(s):
Tony,
I'm not familiar with the ISD4004, but I've connected two different RC Systems speech boards to mobile phones. Both times I used a 1:1 audio transformer, as some of the amplifier chips don't...