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| General Electronics Chat This forum is for general chat about electronics, eg: Dont know what a part does? Dont know how to read a circuit? Want to get an opinion? |
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28th September 2007, 11:14 AM
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 i see. yeah i connected to resistor and cap already. when i switch it do i on and off? or just turn it on? | |
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28th September 2007, 11:18 AM
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Dont leave the START switch ON, its just needed to start the ADC ic running.
__________________ Eric "Good enough is Perfect" PIC tutorials: Gramo's: www.digital-diy.net/ Bill's: www.blueroomelectronics.com/ | ||
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28th September 2007, 12:40 PM
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| do i have to pulse the start switch? or simply turn it on? i have a vref and the analog input voltage is provided by a voltage divider made up of a potentiometer and a fixed biasing resistor | |
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28th September 2007, 12:43 PM
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| okay ill try | |
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28th September 2007, 01:04 PM
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Just pulse it once, after you have connected power to the ADC. That will start it going.
__________________ Eric "Good enough is Perfect" PIC tutorials: Gramo's: www.digital-diy.net/ Bill's: www.blueroomelectronics.com/ | ||
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28th September 2007, 01:07 PM
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| hi, i solved the problem. the problem was caused by a wrongly connected pin. the circuit works fine now. however, it seems to work even without pulsing the switch. this seems weird. by the way i'm running the whole thing on a 6 V dc power supply. any simple ideas on how i can reduce it to 5? i tried biasing with a 2k and a 10k resistor but it doesn't work | |
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28th September 2007, 01:14 PM
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Try this, it should be OK.
__________________ Eric "Good enough is Perfect" PIC tutorials: Gramo's: www.digital-diy.net/ Bill's: www.blueroomelectronics.com/ Last edited by ericgibbs; 7th July 2008 at 12:22 PM. | ||
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28th September 2007, 01:17 PM
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| how does that work? btw should i just leave the switch as it is? it seems to not be contributing to the circuit | |
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28th September 2007, 01:21 PM
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Sometimes the ADC will work without the Start switch, but sometimes it won't, so leave the switch in as the datasheet says. Use it when it dosn't start itself, OK  The diode 1N4001 drops about 0.7Volts.
__________________ Eric "Good enough is Perfect" PIC tutorials: Gramo's: www.digital-diy.net/ Bill's: www.blueroomelectronics.com/ | ||
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28th September 2007, 03:13 PM
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| okay. oh yeah! how did i not think of that. diodes have constant voltage drops cool. thanks. | |
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9th October 2007, 03:55 PM
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| im done with my project. demoed it yesterday. thanks alot for helping me with the ADC. here's a pic. cheers | |
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