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19th June 2008, 11:30 PM
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 The Schmitt trigger inputs require VDD*0.8 (4V when VDD = 5V). I've tossed a transistor on the input, although the relay ON should turn off the transistor. | |
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20th June 2008, 01:24 AM
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| Hi Bill, provided the relay is powered by +12V you've plenty to play with. Use 8K2 for R3 and 4K7 for R1 in the voltage divider. This will give you 0.532V for 'L' and 4.292V for 'H' with the same (as mentioned before) coil resistance of 240Ohm. Using 5K1 for R1 won't change much, but the 'L' condition will also travel upwards. CMOS Schmitt-Triggers are satisfied with lower input voltages. They just require VDD/2 (in that particular case slightly above 2.5V) Hans | |
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Linear Mode
