Circuit Board
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 SEIKI CIRCUIT BOARD 08408436 0840 8436 0840 8436 CNC MACHINE  US $10,000.00
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 HP 3070 In Circuit Board Tester w Manuals Licences NR US $9,999.99
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 LPKF ProtoMat C60 Circuit Board Plotter US $9,350.00
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How do buttons on TV remote activate on circuit board?
I just took apart a universal remote control. I had always thought the button on the top of control finished a circuit. The button is built onto a soft foam pad and looks like a non-conductor. Either the circuit board has a pressure sensitive switch or this thing works by ....? I have no way to see if the little piece of foam is a conductor or non-conductor. Do you know how the buttons on this thing operate.
There are two types. One uses magnets to pull tiny leaf switches in. The other type is by capacitance. A capacitor is nothing more than two flat conductive surfaces which when placed very close together produce some capacitance. The circuit is designed so that when a capacitance is seen it triggers a switching action in an IC. The same principal as those lamps which you have probably seen which turn on when you touch them.
Circuit Skills: Circuit Board Etching
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SEIKI CIRCUIT BOARD 08408436 0840 8436 0840 8436 CNC MACHINE US $10,000.00
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HP 3070 In Circuit Board Tester w Manuals Licences NR US $9,999.99
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LPKF ProtoMat C60 Circuit Board Plotter US $9,350.00
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 Citizen Circuit Board PCB F 2025 2 F20252 P1 34ABN US $5,000.00
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 Circuit Board PCB IDX 5C AE 133A IDX5CAE133A MS HN US $5,000.00
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 Circuit Board PCB AE 113AK BX610 AE113AKBX610 AE 134 US $5,000.00
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 Circuit Board PCB B4 MEM G1 B4MEMG1 US $5,000.00
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 Gespac Circuit Board BEBMIA 104 BEBMIA104 CBI 2000 J1476A BEBMIA104 X7 US $5,000.00
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 Airtronics Circuit Board D9 34981D D934981D D9 3498ID US $5,000.00
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