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differential Amplifier Problem on oscope(50HZ)
Hi , Friends
I need to ampifire a small Ac Signal that between (1 to 20 mv on 1000 HZ ) so i found this when i try to test this circuit with Dc input it work good
as ac signal add on dc for dc blocking i should to add 2 cap in input , after...
sorry for bad wring ! I'm beginner in English . no i can not purchase that in my country its unavailable here.
about power supply i have +5 V , -5 and Gnd
and i can purchase 0.1 % resistor .
Thanks for your kindness .
Hi ,
Could you please help me for read voltage battery in series same as this block diagram but Adc of microcontroller. how i can divide voltage of each cell ?
Thanks in advance
Dear i use another diode and use oscope for directly measurement , but as you see in picture they are not equal , did you have another method for convert sin wave to dc for measurement?
Hi friends ,
I have 100 mV to 3 V Ac signal with 700 Hz frq and i should to measure the rms value with Mirocontroller (Avr -BasCom) then i use this circuit but that is very big error that you can see in attached picture , please help me for find best method to convert Peak Voltage to Dc value ...
Dear srizbf
this method Dependent on shunt error .for measure that we need precise shunt do you have any method can measure current without shunt resistor as i ask that in previous post ?
Hi My friends.
I have a problem with measure ac current , I have a 100 to 200 ma AC @ 1KHZ current that should be measure via ADC , first step i use acs715 but low current cause very low voltage plus noise on acs712 output so i can not use acs712 for this range of current .
anyway i should use...
Re: Virtual ground problem . not eqal ecah output Voltage
thanks its good idea but i con not find LT1118 in this region , could you please Suggest me another regulator
Thanks
Nima
Virtual ground problem . not eqal ecah output Voltage
Hi ,
I have 12 VDC but i need + and - 5 Volt for micro-controller and op-amp on my board
i see this model of convert 12 to +-5 Volt but when I test this method i have + 6.4 in one of and in another side i have -5.1 why they don't equal ...
Hi My friends
i need pure sin wave that Fixed at 1khz But we have two limitation
1- i need 500 mA Current
2- i Can not use transistor for that current because in some of method that transistor going to hot .
power supply is 12Vdc
amplitude near 5 V
Thanks
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