Hi,
I am a student bugged with a prob that's left my college project stuck halfway. My project is Scratch input.
http://courses.cit.cornell.edu/ee476/FinalProjects/s2009/gh96_jbw48/gh96_jbw48/index.html
The link contains the design and the project report of a Cornell university student who had done the same project. i'm not using microcontrollers but instead using the Java platform. However, the hardware circuit is the same. I've tried the hardware design provided in the link, but it just doesn't give the desired result. So, i changed the amplifier design i.e. instead of using the power amplifier IC (LM358) i switched over to the tranistor amplifier. The thought behind the change was that the IC may not probably detect the feeble sound and hence we decided to shift to the t-t design. BF414 amplifier gave us good results (which was salvaged from a transmitter circuit), but we do not have the design of BF414 amplifier design. The result improved,but its still not as desired. The desired result too is shown in the link (the pictures of the signals in CRO).
Please help asap. Pass on your thoughts on what can be done on the project and the BF414 design.
<snip> is my ID.
I am a student bugged with a prob that's left my college project stuck halfway. My project is Scratch input.
http://courses.cit.cornell.edu/ee476/FinalProjects/s2009/gh96_jbw48/gh96_jbw48/index.html
The link contains the design and the project report of a Cornell university student who had done the same project. i'm not using microcontrollers but instead using the Java platform. However, the hardware circuit is the same. I've tried the hardware design provided in the link, but it just doesn't give the desired result. So, i changed the amplifier design i.e. instead of using the power amplifier IC (LM358) i switched over to the tranistor amplifier. The thought behind the change was that the IC may not probably detect the feeble sound and hence we decided to shift to the t-t design. BF414 amplifier gave us good results (which was salvaged from a transmitter circuit), but we do not have the design of BF414 amplifier design. The result improved,but its still not as desired. The desired result too is shown in the link (the pictures of the signals in CRO).
Please help asap. Pass on your thoughts on what can be done on the project and the BF414 design.
<snip> is my ID.
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