Compnents help

[moaner]

I'v edecided to build a solid state mic preamp, and I'm currently looking at all the components I need.

When I came to find ym resisotrs, I found they came in different wattages. the strongest signal there will be in a preamp is presumably either the signal from the battery or the line level signal produced. Will 3w be enough, or will I have to go for nearer 5w or 10w resistors? The higher wattage ones don't seem to come in higher ohmage options, so I'd have to put them in series.

moaner

[moaner]

£5.47 of components without housing, wires or solder. not bad. Why doesn't everybody do this?

This is what I'm gonna make:
http://www.mitedu.freeserve.co.uk/Circuits/Audio/ecm.gif



Also, I've been thinking about the housing. would something like a biscuit tin or Jam jar with a drilled lid and all the wires inside do the job? 100% low budget....

Also, When I looked at capacitors, they didn't make audio quality ones to the values i needed, so i got normal ones. They said the audio ones were for things like crossovers, and that the ones i had were suitable for "coupling" or somehting. Is it ok to use cheap caps?

[moaner]

Also, is ground connected to the casing, the -ve XLR, the -ve jack or what?

[Aes820]

1/4 watt resistors should be fine for up to 24 volts.
Use 1% tolerence ones for best results.

Because those capacitors in the schematic are polarised. You'll probably need to use Tataluym capacitors. Or Electrolic for the higher value ones.
Once again, use low tolerance ones for best results.

You can buy aluminium or plastic project boxes from electrical hobby stores (like radio shack). rig them up in that.

All grounding points should be connect to each other in some way or another. If you are mounting it in a metal project box, then the boxes casing would work well as a common grounding point.

[moaner]

1/4 watt resistors should be fine for up to 24 volts.
Use 1% tolerence ones for best results.

Because those capacitors in the schematic are polarised. You'll probably need to use Tataluym capacitors. Or Electrolic for the higher value ones.
Once again, use low tolerance ones for best results.

You can buy aluminium or plastic project boxes from electrical hobby stores (like radio shack). rig them up in that.

All grounding points should be connect to each other in some way or another. If you are mounting it in a metal project box, then the boxes casing would work well as a common grounding point.

ok, thanks.

[moaner]

would a 1k3 resistor be ok for the 1k one? maplin don't do 1k resistors in the wattage and tolerance i was on.

[Aes820]

Go for a 2% or a 5% tolerence one then. There should be millions of 1K resistors going around.