[ebag4]

Very nice!!

Question, did you use anything (diodes for instance) to keep the various units you are powering from injecting noise into each other or is this not necessary?

Best,
Ed

[praedet]

I did.  I used the same diodes as Gary uses in the Buffer kit on all 5 in/outs...

Hopefully it will prevent exactly that

[HAL]

Did you put the diode in parallel with the DC input as Gary does for protection, or in series with the DC input?  In parallel, it will only limit voltage peaks to the diode Peak Inverse Voltage rating.  In series it will also protect the unit from reverse voltage, will have a max 0.7VDC drop across the diode and may help with back noise transfer.  If you follow the diode with a capacitor to ground, it will also help with HF noise getting back to the other wiring.

Just a thought.

[praedet]

^^^I had no idea to do that

Any chance you can draw me a diagram?

[TrungT]

Did you said "diagram"?


Saigon VN   

[HAL]

This is what I am describing.



The diode still needs a high current rating like the one that Gary uses.  The voltage drop across the diode will be up to 0.7VDC depending on current draw.  The cap should be a plastic film or HF cap like Silver Mica to help filter any noise at high frequencies. 

[praedet]

Hmmm, would that 0.7 VDC drop be bad for any components running off this power source?  What size cap should I be looking for?

How much do I loose out if I don't have this in place?

[HAL]

It is only an idea. 

The cap does not have to be a large value, probably 0.1uF/50VDC to act as a HF filter for any noise the components downstream might generate.  Just has to be a cap that works in the frequency the component generates noise.  That is why a silver mica or film cap would be a good option.

If it already sounds good without it, I would not bother. 

[praedet]

Well, right now I only have the buffer on it.  I plan to have an amp, the buffer, and a DAC running on it in the future.

Right now it sounds exactly like it did when I ran the batter directly to the buffer.  It does not seem to change when the charger, or the gauge, are on...

[HAL]

Just listen as you add components to see if there is a change. 

If so, try the parallel caps on the Neutrik output connector without changing the diode and see if it makes an improvement.  By putting it at the output Neutrik connectors will help shunt the noise to ground before getting to other components.

[praedet]

^^^Sounds great, thanks a lot!!!!!