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Hi Guys - need a little help.
So decided to take your advice and jump straight in. I had the opportunity to buy for not much what looked like someone else's DIY project which was a stepped attenuator in a aluminium case single input / output. There was some issue with the grounding so I took out the attenuator which seems to be made nicely and bought RCA connectors some wire, solder, a switch, cheap multimeter and spent yesterday wiring it up,
Attached my wiring diagram - done on powerpoint (this is my first attempt - so no cheap shots). Does this look correct?
I wired it up yesterday (only burnt myself twice) and I have tested the resistance between the Right input and Right output = 10 kΩ same for left, and the switch works (switching signal from one input and the other.
I'm a little confused on how to test the attenuator. I found the following wiring diagram from hificollective (it looks like the attenuator was from them and I bought my bits and pieces from them too - nice service)
So it looks like testing resistance between in and out will just give you the resistance of IPR (in the diagram) in my case 10kΩ - so all good?
How do I test the various points along the attenuator?
I'm off to pick up a set of old powered speakers from a mate to test my monstrosity as Im scared to blow up my hifi
Can anyone comment on the diagram and on the attenuator testing?
Thanks
Petert
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I guess this threads gone dead. Just to feedback the whole thing worked fantastically.
Absolutely loving the passive pre, it just seems to have sharpened everything up. I think I have been bitten by the DIY bug. Need a next project.
Peter
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No not dead it all the Xmas shopping we have to do,
But this site is good fun and well enjoyed by many give it a go, Marco is there any way we can dump mini books on the system like a library ?
http://sound.westhost.com/projects.htm
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Thanks Colin.
I am just loving listening to my passive pre. Despite my rather amateur soldering it sounds just wonderful and there is something about having cobbled it together yourself that makes listening a little sweeter.
I have several components that may benefit from low noise PSUs (Caiman DAC Mk2 (12v), Angle Audio Phono stage (12v) and Squeeze (9v)) I'm considering building these if I can find the components at a decent price and not kill myself in the process.
I have some info on PSU design and get the gist of transformers, rectifiers, smoothhing etc (well in theory anyway).
If anyone has some direction on nice simple design and cost effective components that would help. - I think Ill start a new thread on this.
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Somewhere in my past drawings I have a PSU that use voltage doubling technique, now this may sound strange, but the ripple frequency is also doubled this means smaller caps or less ripple, give it a spin.
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