Key matrix circuit ... Help

funky2x · 26th February 2010, 04:47 AM

I need some help to put this circuit into work ..
any idea of pcb design ....
am not good at this matrix

nigelwright7557 · 26th February 2010, 10:11 AM

You need 4 off the isolating protection diodes in case two or more keys are pressed at once.
Also the lower diode should be in the same place as the upper two.

funky2x · 26th February 2010, 11:38 AM

still nothing ... thank you

26th February 2010, 10:11 AM	#2
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	You need 4 off the isolating protection diodes in case two or more keys are pressed at once. Also the lower diode should be in the same place as the upper two. __________________ http://www.murtonpikesystems.co.uk PCBCAD50 pcb design software.

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26th February 2010, 11:38 AM	#3
funky2x diyAudio Member Join Date: Jan 2008	still nothing ... thank you