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  • en Lundahl moving coil stepup calculator

    Description: If you want your moving coil pickup to "see" into the right impedance load you may have to place a resistor on the secondary side of the transformer. My...
  • en Duracell 9V alkaline Ultra vs. Plus battery test

    Description: We have just finished building our new IR datalink USB which is 9 Volt battery powered. We decided to implement a battery gauge in the new IR datalink, so...
  • en Advanced shooting trainer

    Description: My brother has build a advanced version of his shooting trainer: The hardware are improved on the following areas: a) a large clear blue/white back lit LCD display, b)...

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