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  1. jpp412

    lm7812 problem

    I have a problem with a 7812 in a power supply such that the output voltage (measured with a dvm) is only 9.5v.  I at first thought the 7812 was bad so I put a new one in and still getting the same results. I have a 7805 and 7905 in the same supply that work fine. Any thoughts?  Is is...
  2. jpp412

    lm339 comparator

    I'm trying to understand the function of the 339.  I have read all of the datasheets (which don't help very much as far as basic understanding) and think that the basic idea is to output high when the + input is > the - input and a low otherwise.  Is this the correct basic idea? Beyond that...
  3. jpp412

    Has anyone implemented the 8 line tele intercom?

    I'm trying to figure out the microcontroller program.
  4. jpp412

    Help on the Link 4+0 circuit

    Hey Austin et al: I am new to this forum and am interested in building the link4+0 for personal use. 1. However, I am somewhat new/inexperienced with this type of thing. I don't see any identification of the parts required to build. Most of them I can figure out by looking at the previous...
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