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In Reply to: For high current low voltage pure DC & low cost, what else can beat it? (nt) posted by cheap-Jack on May 8, 2007 at 10:50:46:
A SLA with a wide bandwidth series inductor?dave
Follow Ups:
Hi.Battery, dry or wet, is a very complex AC network by itself, techncally much worse than a capacitor.
To provide a bypass for the return signals, I installed a 5uF250VAC fan-motor cap, & a 333nF250VAC PP box film cap parallel to the battry O/P terminals. Also 2uF100V PE box film cap at the heater
DC supply I/P in the phonostage side.If the idea of addding a "wideband" series inductor is to remove the RF noises emitted from the SM charging board, then it would be needed.
As when the SLA cell is draining to power the tube heaters, the SMPS board is swithced off & electrically totally disconnected from the battery circuit. Of course, I already add RF ferrous suppressor ring onto the phonostage power cord as well as the DC O/P power cord of the batttery power pack as a RF safeguard.
the last thing you want to do is bypass the battery. since AC signal (your music) will appear on the + terminal it has two choices to get to audio ground. through the DCR of the filament or through the impedance of the filament supply. The wideband series choke prevents the music from using the battery as a path to ground.
Hi.Do I still need a wideband choke?
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