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  • en 6h30 SRPP preamplifier

    Description: My brother and I have build a preamplifier with 6H30 double triode in SRPP mode. We have chosen the same design we used in our tuner as we like...
  • 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,...
  • en TDA7439 tone control

    Description: Browsing through the Elektor magazine my brother found an interesting tone control based on Sony IC, but it was impossible for us to find this IC in any...

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