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changing LCD display to LED display?
I have a DM303 digital multimeter. It has a NJU9201BD A/D converter. I know that NJU9201BD is for LCD display, and NJU9202BD is for LED display but they are otherwise identical. I have my LCD display damaged and want to make it a LED display as I don't get spare LCD display. I want to make it by 7segment common anode LED displays. So, How can I do that? I know, just soldering right pins to right segment won't work. I tried to use a transistor to amplify the voltage, but in that case, the led display dims when it is opposed to be OFF. and not major luminance change occurs when it is opposed to be ON. I think I have successfully given details needed. If any further clarifications needed, just mail me. Thanks
You need the LED version of the chip, or lots of drive transistor cicruits that can discern between the "on" and "off" state. LEDs drive with funny waveforms.
That chip is rather common, and should be pretty easy to get a compatible LCD, but you may need to modify your circuit board. You could ask around for a DMM somebody has blown, which likely will have a good LCD which you can likely use, or move your A/D chip to.
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