GSSL short question - capacitors swap ?

[frejo89]

Hey All!

I have a question concerning the GSSL project and Iam pretty sure you all will be able to assist quite easily.

I would like to avoid the tantalum capacitors in there.

What should I go for ?
- Low ESR electrolyte ?
- multilayer ceramic capacitor (MLCC) ?
- foil cap ?
- ...

any other advice/recommendation ?

Thank you in advance!

Jonas

 

[Script]

The tantalums are only in the ATT and REL timing network. Some say tants are particularly good for that application.

 

[TwentyTrees]

If you do decide to go ahead and substitute the tants though, you're probably looking at aluminium electrolytic.

 

[frejo89]

What will happen by using a ceramic one ?

 

[TwentyTrees]

It depends entirely on the capacitor's value and what it's doing in the circuit. I don't know the GSSL circuit so I can't tell you, but other dielectrics would usually be physically a lot larger than electrolytic - often too large to fit.

There may be other factors at play here too, as Jakob's schematic for the GSSL specifies tantalum in those positions. I remember JR noting that they can behave slightly differently from other types in timing circuits.

 

[gyraf]

ceramic (mlcc) won't work well, they have hugely voltage-dependent capacitance

just use tantalums as suggested - or possibly wima mks02-type polyesters if you for some reason can't source the tantalums..

/Jakob E.

 

[frejo89]

Ok