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This is a list of the least expensive 'hobbyist' parts available from popular distributors such as Mouser, Digikey and Jameco. The aim is to provide a library of the most commonly used parts. So when you need a 100uF capacitor you can be sure that the links here will take you to the cheapest part.
Mouser's in-house brand (Xicon) is inexpensive and good for general hacking. The "General Purpose" part numbers look like this: 140-XRLxxVyy-RC where xx is the voltage and yy is the capacitance. For example 150-XRL-50V1.0-RC is a 1.0uF/50V capacitor.
Digikey's cheapest brand is Panasonic KS, KA and M series. The part numbers look like ECE-A1CKA470U where the single letter encodes the voltage rating.
|6.3V||Digikey Mouser||Mouser Digikey||Digikey Mouser||Digikey Mouser||Digikey Mouser|
|10V||Mouser||Mouser Digikey|| Mouser Digikey || Mouser Digikey ||Mouser Digikey|| Mouser Digikey
|16V|| Mouser || Mouser Digikey ||Mouser Digikey||Mouser Digikey||Mouser Digikey Jameco||Mouser Digikey Jameco|| Mouser Digikey
|25V||Mouser|| Mouser Digikey ||Mouser Digikey|| Mouser Digikey || Mouser Digikey || Mouser Digikey ||Mouser Digikey Jameco||Mouser Digikey Jameco|
|50V||Mouser Digikey Jameco||Mouser Digikey Jameco||Mouser Digikey Jameco||Mouser Digikey Jameco||Mouser Digikey Jameco||Mouser Digikey Jameco||Mouser Digikey Jameco||Mouser Digikey Jameco|
Standard ceramic 'blobby' bypass capacitors: good for high frequency filtering. Less leaky than electrolytic.
|1.0uF / 50V 10%||AVX SR215E105MAR|| Mouser, Digikey
|"||1.0uF / 50V -20%/+80%||
|"||0.1uF / 50V 20%||AVX SR205E104MAR|| Mouser, Digikey,
|"||0.1uF / 50V -20%/+80% reel||Mouser|
|"||0.01uF / 100V||Kemet C315C103K1R5TA|| Mouser,
|0.1uF 100V||Generic||Digikey Mouser|
|680pF ceramic capacitor||Murata RPER72A681K2P1B03B||Mouser Digikey|
|20pF ceramic disc capacitor||Generic||Mouser Digikey|