At 05:13 PM 3/5/00 +0100, you wrote: >Does anyone know, at which voltagelevels a CMOS schmittrigger switches, with >a 15V power supply? CMOS generally switchs at 1/3 and 2/3 of Vcc. So in these case, 5 V off and 10 V on. The hysteresis is 5 V spread. ================================================================ 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 causae scire" ================================================================