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picbits said:For measuring battery voltage this isn't an issue at all but for some of the more sensitive sensors it could be.
Want a fight ?Nigel Goodwin said:Which was why I specifically mentioned that reason - if it's for a high impedance source then simply use a higher value potential divider followed by a buffer (as my tutorial hardware does).
jay543_uk said:how does the 7660 give out a negitive figure if its running on dc, negitive figures are only on ac. is the 2.5 ref on the pic ad3
can you make it any simplier or is that as simple as it gets.
iv just re read the basic electronics book iv got on opamps and it just talks about ac
jay543_uk said:iv attached a circuit that i made from info in one of the last posts by picbits, iv not added any filters yet but is this the right sort of idea. i under stand that the opamp will never go above 3.2 volts so the pic is safe.
does it need a filter after it, ie resistors and caps.
picbits said:I only put the filter after the opamp so I interfere with the input signal as little as possible. Some of the crankshaft/camshaft sensors use a high frequency drive to them so I'm a little wary about putting any capacitance on thats side of the opamp.
In practice it probably wouldn't affect them too much but as I'm desigining stuff for use on customers cars I wouldn't want to take the chance.