At 06:39 AM 6/7/01 -0700, you wrote: >in my circuitry I have it set up like this: >use a zero crossing opto triac like moc 3030 or moc 3031. > this isolates the line voltage (trigger signal to power line) >the trigger voltage is square wave +5vdc.@50% duty cycle. >0 volts led off-----+5vdc led fully on instantly current limit the led >portion with a 330 ohm resistor. >triac side of opto connects between gate and mt2 terminal of alternistor >(hot wire side). >look under application notes on thyristors. > >an1007 and such.. >just becareful to connect as shown to terminals mt1-mt2. >it blows up if the terminals are reversed with the triac what a mess . I use a 820 ohm resistor through a MOC3011 LED to use the triac side to switch a heavy duty triac. I've found that 5 mA reliably triggers the MOC3011 device, so 820 ohm works for 5 V. ================================================================ Robert A. LaBudde, PhD, PAS, Dpl. ACAFS e-mail: ral@lcfltd.com Least Cost Formulations, Ltd. URL: http://lcfltd.com/ 824 Timberlake Drive Tel: 757-467-0954 Virginia Beach, VA 23464-3239 Fax: 757-467-2947 "Vere scire est per causas scire" ================================================================ -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics