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  1. keystrike

    negative to positive level shifting

    great. Thanks!
  2. keystrike

    negative to positive level shifting

    Ok, I think one of the chips here might be right for me: http://search.digikey.com/scripts/DkSearch/dksus.dll?Cat=3736383&keywords=Optoisolators&vendor=0&mnonly=0&newproducts=0&PV474=40&PV64=2&PV7=3&PV7=2&stock=1 Do I want Transistor, Darlington, Transistor with VCC, or Transistor with Base...
  3. keystrike

    negative to positive level shifting

    Ok here we go, for very complicated reasons I don't want to explain, here is my setup: I have a 68hc12 that needs to talk to a digital resistor chip over SPI. Microcontroller: Gnd: 0V Vcc: 5V dig resistor : Gnd: -5V Vcc: 0V So as you can see I need to level shift into the negative voltage...

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