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my amplified ear wont work!
I built the amplified ear found at
http://www.electronics-lab.com/projects/audio/023/ I do get some noise out of it that sounds a lot like one of these listening devices but thats it. No sounds are picked up by the mic. I used a condensor microphone taken from an old panasonic tape recorded. It has a blue and a red wire. I also swopped them around. Nothing. What could be wrong. All trannies have hfe's of 140-180. Also, what does the dashed line between C6 and SW1 in the circuit represent? I don't have such a connection in my circuit. |
#2
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my amplified ear wont work!
Hi,
I built the amplified ear found at http://www.electronics-lab.com/projects/audio/023/ I do get some noise out of it that sounds a lot like one of these listening devices but thats it. No sounds are picked up by the mic. What could be wrong. All trannies have hfe's of 140-180. Use the specified transistors, they have higher h_fe. -- Regards, Soeren * If it puzzles you dear... Reverse engineer * New forum: URL:http://www.ElektronikTeknolog.dk/cgi-bin/SPEED/ |
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