470pF non polarized, non ceramic

[r00n]

I am making

 https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwjY7K-y7_aCAxXQyDgGHegNCAEQFnoECBUQAQ&url=https%3A%2F%2Fwww.instructables.com%2F3340-Voltage-Controlled-Oscillator-Module-for-Modu%2F&usg=AOvVaw1fzwP18kthiOJkNYixX6-V&opi=89978449

The BOM refers to "1x 470pF non polarized, non ceramic (you need something stable with temperature)". I only know the non polar ceramic caps and the polar canister caps and have no knowledge of other types.

Could you please assist me if you have a moment? Thanks for your help.

*fixed link

[Slh]

The link isn't working but from the description I don't know why an NP0/c0g ceramic cap wouldn't work. Alternatively, you want to look at silver mica or film caps. I can't remember what the best film material is for temperature stability but elsewhere on the internet will help.

[bdunham7]

It sounds like they mean a film or metallized film capacitor, typically mylar, polypropylene or similar polymer films.

https://www.digikey.com/en/products/detail/wima/FKP0C004700B00KSSD/9370033

[Coordonnée_chromatique]

https://www.eddybergman.com/2020/01/synthesizer-build-part-18-really-good.html

[wraper]

Actually the requirement is nonsensical. COG or NP0 ceramic capacitor like this https://eu.mouser.com/ProductDetail/TDK/FG28C0G1H471JNT06?qs=qf2ddTMq67XgQnSCHEHPgQ%3D%3D is more stable than film (that was most likely meant) and will work just fine. Why in hell write what it shouldn't be instead of writing what it should be. Also I suspect that for some other capacitors "non polarized" requirement by itself is not adequate and you need something more stable than Y5V ceramic capacitor. Post the circuit here, not going to register just to see it.

[floobydust]

The Curtis IC CEM3340 VCO goes back to the 1980's, an era full of drifty ceramics.
Today you would use a C0G or NPO. Mica costs a small fortune, $4-8ea.  CD15FD471JO3.

[Kleinstein]

Ceramic capacitors come in different version. C0G version are actually quite good (better than most film types) when it comes to stability and they are perfectly available as 470 pF.
Even in the 1980s they should have had C0G - maybe called by a different name.  If needed there are also capacitors with defined positive and negative TC to compensate for other parts drifting.
In the early days 470 pF may have been relatively large for a C0G cap, but todays it is absolutely no problem.

There are more tricky ceramic type like X7R and X5R, but these are usually used only for higher capacitance, mainly for decoupling and similar tasks where the exact capacitance does not matter.
With 470 pF a electrolytic version makes not sense - these are usually 0.5 µF and up, so at least 1000 x larger.

[DavidAlfa]

Probably because the inmense majority of ceramic caps are x5r/x7r, not c0g, so they simply state to not use them to avoid issues.

PP/MKT capacitors will do great.

[TimFox]

Before MLCC ceramic construction was available, "disc ceramic" (one dielectric layer with two electrodes) capacitors were made for relatively high voltage, but low capacitance in NP0 (good) dielectric.
For example, the Ceramite (originally Sprague) NP0 discs rated at 1 kV are still available up to 270 pF (0.89 inch diameter), but in N750 ceramic they are available up to 1000 pF (large negative tempco but good loss).
So, when that design was made a stable disc ceramic capacitor was iffy at 470 pF, but mica capacitors were not yet overpriced.

[Dan123456]

If it is the blue one on the top right of the red board (near the trim pots), that looks like a MKT 

From the picture though, it seems to say “1N” on the board but maybe there is just a 1N ceramic hidden behind it 

[r00n]

thanks, sorted.