Can I Replace 10uF Disc Ceramic Capacitor C4 With Electrolytic in PICMeter Part2?

I am having some problems obtaining a single  10uF disc ceramic capacitor, shown as  C4 on Fig.8, at a reasonable price. Is it detrimental to replace it with an ordinary electrolytic capacitor? Resistors R1 1Mohm and R2  10kohm, shown on Fig.8 appear to have had their idents accidentally reversed on Fig.4 but I think that is obvious from the writeup. The project so far  shows great promise and I look forward to its development.Thanks Mike (in the plural).Regards Ken.

I do not have access to the article or to the schematic. If C4 is a power-supply filter capacitor, an electrolytic would probably work. If C4 is in a signal path or precision timing circuit, try using a 10uF film capacitor. A 10 uF film capacitor has more stable capacitance than a 10 uF ceramic capacitor usually has.

Thanks for your advise, C4 is in a signal path so it looks as if I will have to bite the bullet and buy one.Cheers.

High-capacitance ceramic capacitors are notorious for their capacitance changing with temperature and with applied voltage. Look up the datasheet for the 10uF ceramic capacitor to see the size of these effects. Film capacitors do not show these effects. Think about what happens if C4 drops in value as the voltage across C4 increases.

In the circuit, C4 is a low ESR capacitor for the built-in 3.3V regulator. Confusingly the schematic does not show the power supply connections but working with DSPIC devices in the past, I know RA6/VCAP needs a 10uF Tantalum capacitor to work reliably.
Take a look at section 2.4 of the PIC24FV16MK202 datasheet, http://ww1.microchip.com/downloads/en/DeviceDoc/30003030b.pdf for more details.
Ian

Hi Peter and Ian. Thanks for the advice, I now have some 10 uF Tantalum caps on order.  At least I will now have a reasonable chance of a working circuit.Ken

On page 50 the author says he has forgotten to connect AVDD
(pin 28) and AVSS (pin 27) but on Fig. 8, pin 28 is connected +3v and  pin 27 to ground, presumably he means to
their respective pins and not to each other? So far I have the display up and
running and it looks pretty good though a little small for octogenarian eyesight.
Unfortunately I get no response from a voltage applied to the input so its back
to the drawing board!