what kind of capacitor do I need? (preamp circuit)

I would like to buy parts for this schematic
http://www.electronicsteacher.com/circuits-and-diagrams/audio-preamp-circuits/preamp.gif

I had a 0.1 uF ceramic disc capacitor laying around which worked, now
I want to make some more of this circuit and am not sure exactly which
type of capacitor to use. Searching mouser.com or digikey for "0.1 uF
ceramic disc capacitor" brings up a ton with all sorts of properties.
I basically want something that is cheap and reliable and general
purpose, so in case I have some left over I could use them for other
projects (probably 3-12v DC audio circuits, small robotic projects,
etc.) I would probably want to spend around $5-$10 and get somewhere
between 25-100 of them. Any help appreciated, thanks...

 

For small general purpose I like the tiny blue ones, epoxy coated ceramic.
Usually good for voltages to 100V, maybe a bit more. Values ranged from 22
pf to 0.47µF last time I looked. You can get cheaper, but if you want to
reuse easily in experiments, and still be left with something fit for
permanent wiring later, those things rule.

 

http://www.allelectronics.com/
..1 uF radial ceramic CAT# RM-104 10 for $.70
..1 uF disc ceramic CAT# 104D50 10 for$1.00
2N3904 CAT# 2N3904 5 for $.75
100K CAT# 100K-1/4 10 for $.50
10K CAT# 10K-1/4 10 for $.50

 

Thanks lots - I will check those out...
If you just want to power your circuit with a 9V battery,
would components rated for 100V drain the battery more than you would
like,
or otherwise be overkill?
Thanks again

 

No overkill. Small ceramic capacitors usually have a high(ish) working
voltage. The ability to take 100V will also make sure that any leakage at
9V is low, not high, so that makes them ideal on low-volt circuits.

The epoxy coating is impermeable to moisture, and withstands a lot of heat
too, so unless there is some quality you specifically need from another
type, those small epoxy coated ones are a good first choice. Maybe if
you're making mass-produces stuff they aren't the cheapest for general use,
but in small scale work it's worth buying them, they don't cost a lot.

 

IDIOT

 

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