Re: 1351-Mouse From: John Iannetta <76703.4244@CompuServe.COM> Reply to: John Iannetta Date: Mon, 10 Aug 1998 08:10:05 -0400 Organization: CompuServe, Inc. (1-800-689-0736) Newsgroups: comp.sys.cbm Followup to: newsgroup(s) References: Thorsten Oelfke said, "I saw a 1351-Mice with a power-indicator. Three LED's were built in and if the voltage is in range of 5VDC a green LED illuminates. If the power gets to high a red LED comes and if the ower is under a value of 4.75V a yellow LED comes.". Here's a design using an LM613 IC, three PNP transistors, and a tri-color LED. LM613 TO ----- ------------------------------ 1 Q1 base through R1 2 Wiper of R8 3 Tie point 1 4 +5 VDC, tie point 1 through R6 5 Tie point 1 6 Tie point 2 7 Base of Q3 through R3 8 Ground 9 Tie point 1 10 11 12 13 Ground 14 Tie point 1 15 Wiper of R7 16 Tie point 2 R7 Hi side to +5 VDC R7 Lo side to ground R8 Hi side to +5 VDC R8 Lo side to ground Q1 Emitter to +5 VDC Q1 Collector to tie point 3 Q2 Emitter to +5 VDC Q2 Collector to green anode of D1 through R5 Q2 Base to tie point 2 through R2 Q3 Emitter to +5 VDC Q3 Collector to tie point 3 D1 Red anode to tie point 3 through R4 D1 Cathode to ground Q1, Q2, Q3 = 2N3906 D1 = Panasonic LN11WP23 R1, R2, R3 = 15 kohm, 1/4 W R4, R5 = 180 ohm, 1/4 W R6 = 39 kohm, 1/2 W R7, R8 = 10 kohm 20-turn cermet trimmer potentiometer R7 sets the high threshold and R8 sets the low threshold. In my post about the firing button, the negative pulse is about 10 milliseconds wide. That may be too short for some programs; I suggest that you change the 0.22 uF capacitor to 0.47 uF. -- When backing up your hard drive, shift into reverse gear S M O O T H L Y. John