5!Schematic File!5Sß †Fù™ ¨ÿÿðANDRESEN ELECTRONICS LTD. April 20 2007Tahomaóÿÿÿ ²:?¨ !,7BMName#Value ToleranceGROUND "?¨!,7BMXcName#Value ToleranceGROUND 𠪨€ !,7BMXVin2REF #Value Tolerance TESTPOINT,V X¸?¨!,7BMXcName#Value ToleranceGROUND ð. ¨€ !,7BMXVoutREF #Value Tolerance TESTPOINT,V X?¨ !,7BMName#Value ToleranceGROUND á²ú<¨  ! , 7 B M XB2152REF #Volts ToleranceBATTERY á²Z<¨  ! , 7 B M XB1152REF #Volts ToleranceBATTERY* ³– dP_¨PèÿÿÿPóÿÿÿPþÿÿÿP PPP*P5U1LM741/NS SUB5REF #Value ToleranceOPAMP9OPAMP9UPd(2  P(17V+TT~<(FP17V+TT~<FP P17V+TT~< dP1++TT~< 2d2P2-+TT~< <<3+VTT~< P<=<4-VTT~< ((5-+TT~< ((6-VTT~< P(3(7-VTT~< "8-VTT~< P.9-VTT~< \SubCircuits\TI LM741.MOD _‚ 2¨ !,7BMXR11KKREF #Value Tolerance Temp CoeffRESISTOR _" 2¨ !,7BMXR21KKREF #Value Tolerance Temp CoeffRESISTOR áXr<¨  ! , 7 B M XB41.2REF #Volts ToleranceBATTERY áX<<¨  ! , 7 B M XB31.00REF #Volts ToleranceBATTERY ²@?¨!,7BMXcName#Value ToleranceGROUND ªm2 ¨èÿÿÿóÿÿÿ  +6AR314.5KREF #Value Tolerance Temp CoeffRESISTOR) êÜ <¨€( ((!(,(7(B(M(XVs1REF # DC: Volts AC: Volts AC: PhaseTran: Distort: VSOURCEANALYSIS0.0011.01.00010000" "‚°!¨ÿVrefESEN ELECTRONICS LTD." "ðŽ!¨ÿEThis circuit displays Hysterisis. If we assume R1=R2=R. Following the" "ð„!¨ÿ=derivation on pg 448 Simpson we find Vr=(+-)R*R3/(2*R3+R)*15." "ð.—!¨ÿDLetting R=1K and R3=14.5K yields Vr=+-0.5V. When the input is rising" "ðBh!¨ÿ?the output changes state when it passes +0.5V, when falling it " "ðVÔ!¨ÿ#changes state when it passes -0.5V.¡"¡ÒÜ¡ÈÒ¡d´d¾¡úÈÈ¡Èr¡Ürr¡È6È¡6¾6È¡¾6¾@¡¾ð¾ú¡¾–¾ ¡¾P¾Z¡dxd‚¡d2d<¡d¾–¾¡Ò–Ò¡–rªr¡–"–r¡d"–"¡d¾d"¡dTdr¡d®d¸¢ÈÈ¢ÒÒ¢d¾d¾¢d"d"