zgnoh Posted February 5, 2005 Report Share Posted February 5, 2005 There is an input current from a CD or a microphone. Then if the amplitude of the sound exceeds a certain level, it activates the switch opening circuit to open a switch.The circuit diagram is here, pls click.Is there any mistakes/flaws with the circuit?moreover, is the "Voltage Follower" correctly used? I suppose a voltage follower = two "not gates" in conjunction. is it like that?Thanks very much. I know this is just so simple as high-school level. Quote Link to comment Share on other sites More sharing options...
zgnoh Posted February 5, 2005 Author Report Share Posted February 5, 2005 oh, sorry, if you don't see the diagram, open a new browser and paste the link there >< Quote Link to comment Share on other sites More sharing options...
ante Posted February 5, 2005 Report Share Posted February 5, 2005 Hi,This is what I get:ForbiddenYou don't have permission to access /zipzipivan/Project.GIF on this server.Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request. --------------------------------------------------------------------------------Apache/1.3.33 Server at www.hostima.net Port 80 Quote Link to comment Share on other sites More sharing options...
zgnoh Posted February 5, 2005 Author Report Share Posted February 5, 2005 I'm very sorry,,, can you open a new browser and paste the link to see it... I don't know why it is like this too>< Quote Link to comment Share on other sites More sharing options...
zgnoh Posted February 5, 2005 Author Report Share Posted February 5, 2005 The link is okay now :'(,,, pls help me. thanks :-* Quote Link to comment Share on other sites More sharing options...
ante Posted February 5, 2005 Report Share Posted February 5, 2005 Hi,I can Quote Link to comment Share on other sites More sharing options...
MP Posted February 5, 2005 Report Share Posted February 5, 2005 I am only guessing here, but it looks like you want to activate a relay with the amplitude of the sound.Is this correct?MP Quote Link to comment Share on other sites More sharing options...
zgnoh Posted February 6, 2005 Author Report Share Posted February 6, 2005 Hi,I can Quote Link to comment Share on other sites More sharing options...
zgnoh Posted February 6, 2005 Author Report Share Posted February 6, 2005 I am only guessing here, but it looks like you want to activate a relay with the amplitude of the sound.Is this correct?MPthanks, yes you're right. IF the amplitude of sound exceeds a certain level, it activates an electromagnetic relay.I have several questions:1) Is Voltage Follower = two "not gates" used in conjuction?2) Do I have to amplify the amplitude of sound so that the voltage is large enough?3) Is there any bugs/logic error in the circuit?4) Any improvement or more convenient ways?Thanks~btw, if I want to make use of the frequency of sound instead of amplitude, how can I make it? thanks~!!! Quote Link to comment Share on other sites More sharing options...
zgnoh Posted February 6, 2005 Author Report Share Posted February 6, 2005 this is what I mean filter circuitVoltage Follower Quote Link to comment Share on other sites More sharing options...
MP Posted February 6, 2005 Report Share Posted February 6, 2005 The amplitude of sound is simply voltage. You can use a comparator to determine the threshold at which the base of a transistor has excitation and trigger a relay from that. This is, in my opinion, the simplest method.MP Quote Link to comment Share on other sites More sharing options...
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