can any one help with the voltage of polyprop caps

[gasket]

hiya guys im trying to build an led tachometer but I don't know what voltage the polyprop capacitors are I have attached the wiring diagram and here is the parts list any help would be appreciated



LEDs:
21 LEDs of any color you want. I used bright white ones. You can use some green, some yellow & some red for the red zone. You MUST use bright ones if you are planning to put paper covers over the LEDs or they are going to be simply invisible
The first LED is continously lit as long as the +12V source is connected. The remaining 20 will be lit one by one as you increase the engine speed

Diodes:
1 x 1N4007
1 x 1N4148
1 x Zener diode 12 Volts

Resistors:
1 x 220 Kohm Trimpot variable resistor (for calibration)
2 x 1 Kohm
3 x 10 Kohm
1 x 22 Kohm
1 x 2.2 Kohm
1 x 470 ohm (I forgot I have one So, I connected two 1Kohm in parallel, see photos)

Electrolytic Capacitors:
1 x 470 µFarad 25 Volts (µ = micro)
1 x 2.2 µF 16 Volts

Polypropylene Capacitors:
3 x 100 nF (nano)
1 x 47 nF
1 x 1 µF (Instead,I used 8 x 100nF in parallel = 0.8 µF :$ & it works)

[pebe]

The highest voltage on any of them is only 12V, so any voltage above that would be OK.
The lowest voltage I have seen for 100nF poly caps is 63V.

[gasket]

thankyou for your reply can you explain how this works I can use any voltage ?

[pebe]

The rated working voltage of a cap is the maximum voltage that can be applied to it without it breaking down. Note 'maximum'. So it is quite OK to use a 63V cap for a circuit that uses only 12V.

If a manufacturer made a 12V working cap he would not sell many. It would have limited use because many people would want a higher voltage working..

[gasket]

thankyou you've made it easy to understand I will post updates as I build im dure ill be back asking more questions lol