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  1. grsparks

    RS232 to 20ma current loop converter

    I am looking for a schematic for an RS232 (from a PC serial port) to a serial receipt printer that uses 20ma current loop on a DB25 connector. If I am not mistaken, it should be able to be done with a couple opto- isolators (transistor). 
  2. grsparks

    Semi Manufacturer's Icon symbols

    Does anyone have a chart or link with many of the symbols identified that are found on the semiconductors and ICs?  It can be the first place to start in locating the datasheet.
  3. grsparks

    switching pwr supplies level1? level3?

    ??? The 12volt 4amp external switching power supply for my lcd monitor burned out. On the back it states it is a "level 3" I found another 12volt 4amp switching power supply that states it is a "level 1" power supply Does anyone know the difference between these and if it is risky to run the...
  4. grsparks

    An excellent electronics manual

    After running across this at the public library in town, I just had to order my own copy: "Practical Electronics for Inventors"  by Paul Scherz It covers just about everything from DC to Microcontrollers and is well illustrated.
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