I just posted one on another forum for a lead-acid. The monitor had a range of 11.8 to 13.8V. I could change it for you if you tell me the range you want to cover.
What does the power supply's voltage have to be? I would like to use the battery I'm monitoring as a supply, with a voltage regulator to cut down the voltage to however much the 3194 needs.
The only thing I'm confused on is the TL071 (U2). What are the pins that are shown in the schematic? I'm guessing IN+, IN-, OFFSET 1 and OFFSET 2, while OFFSET 2 is attached to GND? Or is IN- attached to GND? Also, on R5, and R8 - are those linear pots?
EDIT: What do the LEDs have to be rated at, in voltage?
The only thing I'm confused on is the TL071 (U2). What are the pins that are shown in the schematic? I'm guessing IN+, IN-, OFFSET 1 and OFFSET 2, while OFFSET 2 is attached to GND? Or is IN- attached to GND? Also, on R5, and R8 - are those linear pots?
EDIT: What do the LEDs have to be rated at, in voltage?
I've edited the schematic to show op amp pin numbers. You can actually use almost any op amp.
The pots are linear. Adjust R8 first, and then R5.
Red LEDs drop about 2 volts, but you can use other colors. Keep in mind that you will only get about 10mA per LED as designed. Let me know if you need more current.
I have a schematic setup question simlair to the opening posters.
I need a 7.2V 6-Cell battery monitor, doesn't need to be adjustable, that will be supplied by the battery it is monitoring, the red LED would light up when it drops 2V or so. I would really appreciate it if someone could tell me how the previously posted schematic can be modified.
I need a 7.2V 6-Cell battery monitor, doesn't need to be adjustable, that will be supplied by the battery it is monitoring, the red LED would light up when it drops 2V or so.
The Opamp is acting as a Non Inverting Buffer. LEDs can be regular LEDs you buy at the store, I think Blue or white would also work, you would have to adjust the resistor for more or less current.
interplex said:
Hey guys,
I have a schematic setup question similar to the opening posters.
I need a 7.2V 6-Cell battery monitor, doesn't need to be adjustable, that will be supplied by the battery it is monitoring, the red LED would light up when it drops 2V or so. I would really appreciate it if someone could tell me how the previously posted schematic can be modified.