Hi guys,
I have a problem with my audio circuit. I use NJM2113 as my audio amp and a 150 0hm speaker. I could not decode the DTMF tones coming out from the speaker. The tones seem to sound ok but can't decode it. When I try to replace it with an 8 ohm speaker, there were some distortions you can hear. But the funny thing is I could detect the DTMF tones. Why is this happening? Is this the result of impedance mismatch?
I have a problem with my audio circuit. I use NJM2113 as my audio amp and a 150 0hm speaker. I could not decode the DTMF tones coming out from the speaker. The tones seem to sound ok but can't decode it. When I try to replace it with an 8 ohm speaker, there were some distortions you can hear. But the funny thing is I could detect the DTMF tones. Why is this happening? Is this the result of impedance mismatch?