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

Mad Scientist Jr wrote in news: snipped-for-privacy@22g2000hsm.googlegroups.com:

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.

.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

snipped-for-privacy@22g2000hsm.googlegroups.com:

Mad Scientist Jr wrote in news: snipped-for-privacy@d55g2000hsg.googlegroups.com:

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.

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