eric@chronon.UUCP (Eric Black) (03/12/86)
> I have several AT&T phones with illuminated dials that light up even > though I only connected two wires. Durned if I know how they do it ... > > -=- Andrew Klossner (decvax!tektronix!tekecs!andrew) [UUCP] > (tekecs!andrew.tektronix@csnet-relay) [ARPA] These phones use high-output LEDs in series with the phone line. The voltage drop across the LEDs is low enough (~3V for 2 of 'em) that the phone is not adversely affected. -- Eric Black "Garbage In, Gospel Out" UUCP: {sun,pyramid,hplabs,amdcad}!chronon!eric VOICE: (415) 941-0403 US SNAIL: Chronon Computer Corp. 2570 El Camino Real W. Suite 206 Mountain View, CA 94040