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Thanks for your help OperaHouse. This worked. I'll play with resistor values to get brighter LED. Banderas[2thumbsup]

skogsgurra, Sorry if my question irritated you,but I tried to build something really simple to indicate when NC switch opens.And I got stuck.I tried pasting my circuit to forum the but it didn't work.I know how to to this with the logic gates but I don't have power available.Thanks for your...

I tried to build a simple LED circuit that is going to operate from 9V battery. When NC switch is closed I wouldn't want to draw any current, but this NC switch opens turns on red LED. Circuit I build was heating up the battery. My only requirements are low power consumption (so battery can last...

Melone, Hi, with "micro" you mean microprocessor? I thought of that originally, but my budget is limited with stock on hand and probably couple more inexpensive chips. I thought of using 68HC11, but those boards are expensive for my application. And I believe HC11 has intergrated 8...

Hi, Sorry for the confusion guys. Let me start all over. I'm building a box that will help me diagnose if my heat exchanger ( here heat exchanger beeing a support equipment for some other tool) communicates with the main tool, before I install it. I'm trying to build a box that will send...

Hi, thanks for replaying to this question. I have already used 7805 to step down voltage from my regulated DC power supply (+-15 V)to 5V and potentiometer in series to change output voltage.I can control temperature by adjusting potentiometer( I believe 40 mV is one C).I'm trying to find some...

Hi, I'm trying to build a box that will simulate 0-5V signal.I'm using this signal as a remote temperature set point for a heat exchanger. I have already tried it using DC power supply and potentiometer in series and it works. Now I'm wondering if there is a driver chip that will do same?Thanks