A question on power supply:
The best solution is to provide an independent PSU just for the Flea. Although this
may sound extravagant, a suitable transformer (0-15 or 0-18v, 3VA) will be both very
compact and cheap. Follow it with a simple rectifier and reservoir cap (1000uF is
plenty), and fed the raw DC into the Flea . The clock circuit is then galvanically
isolated from the player, and the output wiring is only carrying the clock signal. When
the Flea is powered by an existing onboard supply via a single +ve lead, then all the
noise currents from the raw supply bypassed by caps C1, C2, C4 are returned to the
raw supply circuit via the shared 0v wire which is also carrying the clock signal
return. Providing an independent supply prevents this intermodulation happening, and
the audible benefits are not subtle.
If I use an external supply, I connect the "power in" +18V and 0V leads direct to the Flea.....but do I connect the Flea Output 0V to the CD player, or just the clock output? The manual is confusing me slightly as it mentions the galvanic isolation benefit of the external supply and implies no 0V connection to the CD player by saying that the output wiring is only carrying the clock signal.
Sorry to be slow on the uptake....!