This is a multi-part message in MIME format. ------=_NextPart_000_0131_01C22F11.8319A280 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Use this. With a 1V voltage drop across the resistor the current is also limmited at about 30mA. The voltage drop parammeter for a zenner diode states for the voltage drop across the diode when reversed biased. So in the drawing attached the diode is "keeping" the voltage at a maximum of 5.1V. If the voltage tends to increase the zenned will permit current to flow trough it so the voltage drop will remain aprox. constant untill the current limit trough the diode is passed and the diode will becone a wire. If the diode becomes a wire, the resistor will get the full current of your batteries I=U/R=6/33=181mA. The power the resistor will try to excange in heat will be P=U*I=6*0.181=1.09W. If you use a 1/4W resistor it will provide also protection for your circuit as it will burn and open the circuit if the current will exceed 50mA. Good Luck, Mircea Chiriciuc. ------=_NextPart_000_0131_01C22F11.8319A280 Content-Type: image/gif; name="6to5.gif" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="6to5.gif" R0lGODlhaAHdAJEAAP7+/szMzCsrK+bm5iH5BAAAAAAALAAAAABoAd0AAAL/hI8zyM3hIlOyAmgj zW1g/oDdIiJfCWzotRoqepax+MptSnK1OINBDrv9WjvfzSM8Am2t4QrZXIKgq55OKilyrBlthmtx oqgwbNf8VSaJ6PD62a6AK97OXHKPiEtkJvw9lucg2LDnV0ZE+BCnoWiiNsWoB1klJGkHyHdZSBnE lsnTeahJsxkSBWqUmKrjeODqYvqI+gR7Ietia1s3gWuw68tCWzlM2iQa+nm8XMt6RqNrucoc6GzB i4esWuXbx9MdDFxqTRcuTT0KTY5nrkz8Xo0+Hrmu1w7PF+3u+Sfv060LXD0H2A4UHKRty7l43Kbh m/eQnj+FDvmN2eRtG6Jm/xOfdbx27+LAQgAXGovYCqLFkyu/VUwnEaVHmSBHnuJIs5xKmFtC8pzZ coq+fjnZvXRJNOiVncmS/sxyS4GpjD33PZXjk6nGq1mGihRq00RJPgLKmi17iWqao1u1UmyIc+PX oo3crnXatITZA2UFeWXJVUPWf2FfHflrd0ThX4O7lEXQtwtisB91Vs4yFu5cpUBrXha8OMBjF2jf cvZMl2DjL6vdsDUN2MOPALNr15aNm3Zu2rx3y76tm3dw4MR/2/Y9fDZa5QKGI3cOvbjw5793945e Pbl06dmJ29ZOHXv07d/DHz+Pfvtz8dPHdzfuQap8+brn278fH7/+BbRx7P+//wMF/y2ggGgC/NLX 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