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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by ricky0066[/i] [br]Hi there This is what i am trying to get working but not succesfully. Can anyone help please. We suppose to connect a circuit with use of TL071,2 op-amps (which will be powered by +-15V) to an i-pod or some similar mp3 player with output around 1V. Now the signal is amplified and then divided into bass, middle, treble using low, band and high pass filters to light up LED for each part of the frequency (0 - 100, 100 - 1000, 1000- ... Hz). [/quote]    Insert an Image File (GIF, JPG, JPEG, BMP, ZIP, PNG) Check here to include your profile signature.