The simplest HPF circuit is the RC high pass filter. The are just like rc fliters but use an inductor and capacitor instead That is it, just using simple series capacitors and resistors produces a high-pass or low-pass filter depending on their orientation.Īdditionally, if you want a slightly different design check out lc filters. Stick with standard ceramic capacitors unless your design requires something else. One word of caution when designing rc filters, try to avoid using an electrolytic capacitor as it is polarised and will have problems with the AC signal being fed into the circuit. If you are worried the real values are too far away just plug in the values you can get into the filter calculator and see if the cutoff frequency of a high pass filter with the real component values will give the output voltage while attenuating the low frequency signals to an acceptable level for your application. The odds are slim you will be able to find the exact values for your resistor and capacitor values but if you get close enough than you should be good to go. That is it, now all you need to do is get the filter components as close to the calculated values as you can. So be sure to choose component values that are rated for your application It is important that you select component values that are able to handle the input voltage and current you expect to flow through the circuit.
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