A few people (such as GameSX member "matt") have mentioned the option of buying ready-made versions of some simple circuits rather than building them. I will probably be building my own, but if I change my mind (or if someone reading this doesn't have the time or skills), where are good places to buy simple pre-built circuits?
The type of circuits I am talking about are 3.58 MHz oscillators (for building RGB to NTSC encoders), adjustable attenuators
(for converting speaker level audio to line level audio), and similar such things.
Any suggestions for sources?