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  1. A

    How to add a Li-Ion charging circuit to board design

    Hello world! I've currently got a tube headphone amplifier that I built using a 12au7 tube. It's powered by a 12v SLA battery / linear external 12.6v dc supply with a rectifier valve to check the battery when on external. The SLA battery is not performing to what I'd hoped however. I was...
  2. A

    RCM 3000 Rabbit Module Test fixture

    Hi, I work with rabbit 3000 modules (AT56C55-UL2T processor/RTL8019AS comm) on a daily basis and I need a better way than I currently have to test them. I'm placing it in programming because I'll need advice in this area to build a test fixture. Currently I place them in operational...
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