Quicksand That Sinking Feeling
- Thread starter aleman
- Start date
I forgot the most important step - drill a 1/4" hole in the chassis plate.
To do this, you must have a piece of scrap wood behind the plate where you will be drilling, or the plate will crack.
It will also go a lot better if you have a bit for drilling plastics, but I use the higher grade of acrylic for these plates (cast), so machining is not as dicey as it could be.
-PB
To do this, you must have a piece of scrap wood behind the plate where you will be drilling, or the plate will crack.
It will also go a lot better if you have a bit for drilling plastics, but I use the higher grade of acrylic for these plates (cast), so machining is not as dicey as it could be.
-PB
Thanks for your help implemented as instructed including the hole in top plate works just fine my fostex speakers now do not jump out of their baskets when being switched on such a simple thing overthought it thus my difficulties glad I asked for help as would still be pondering how to implement this. Will post a picture when phone has recharged to show in in situ .Again my thanks .
aragorn723
New member
Hi,
Out of curiosity, how do you power the quicksand? I see the power jack between the speaker outputs.
Dave
Out of curiosity, how do you power the quicksand? I see the power jack between the speaker outputs.
Dave
Oh, yeah, I didn't notice that.
If you're going to power the Quicksand from a wall wart or other switching supply, capacitor selection on the PC board will be critical in more locations.
-PB
If you're going to power the Quicksand from a wall wart or other switching supply, capacitor selection on the PC board will be critical in more locations.
-PB
Sorry for the late reply ,been away from the computer the power supply comprises of a car battery 12 volt dc 68 amps or 9 volt dc never connected supply in stand alone box from trichord research this was originally to power the trichord clock3 on my teac t1 transport now unused but still in fine fettle. Thus I decided to use a separate socket for attaching power cord to the quicksand.not actually using any wall wart or switching supplies albeit that I have a few belonging to variouse Beresford dacs in my possession but the dac is also dc from a 12 volt dc car battery.one thing of note powered up briefly with lowther dx3 attached still loud thump disconnected lowthers fostex 206e woked fine ,connected lowthers to my ladyday 300b amplifiers with quickie preamp and source speakers fine no switch on thump puzzled but as lowthers very expensive no further experiments with quicksand for now until I can ascertain the problem when using the lowthers but with fostex 206e sound very good .will have to suck it and see any suggestions appreciated.
All problems sorted with lowthers reconnected the lowthers in the early hours followed the exact order of switching on source quickie and quicksand with mute switch on left 15 seconds approx. very low plop sound through with mute switch on nothing to trouble the lowthers or any other speaker after which came forth music bearing in mind lowthers no boxes sounded not to bad.lowthers put away until I can decide which horns to build mute switch fine therefore the error must be mine ,inadvertently pushed switch in wrong order.thanks for all the help quicksand working as it should mute switch and all.
Ah, yes, I could imagine that the turn on thump would be a bit more troubling if the driver wasn't mounted into any kind of enclosure.
Have completed all I wanted to do to the the quicksand now the volt meter has arrived fitted today fairly straight forward but no template .Works as it should will rebuild quickie preamp next year to incorporate these meters as an indicator of batteries running out.Now back to the music.
Attachments
That's pretty cool! You'll end up having the most analog looking digital amp out there.
Must admit had not given any thought to that aspect of things.The amplifier continues to improve I cannot believe the sound quality for the money superb ,from what I have read the parts to burn in last will be the Russian Teflon bypass caps I have used so the sound may change again slightly over time must have about 80 hrs on the amplifier so I will see.
aragorn723
New member
Hi,
Someone might have asked this already, but what kind of wire did you use? Also, where did the voltage meter come from?
Dave
Someone might have asked this already, but what kind of wire did you use? Also, where did the voltage meter come from?
Dave
Wire used is 0.5mm pure silver as had some spare on a reel from about 10 years wire with Teflon insulation Teflon used as does not melt so readily when in contact with soldering iron,there is some debate as to which insulation to use but I find this works for me a now middle aged and hands not as steady as once were . The meter was from this seller on ebay sellerbible price was around £3.21p cheap and works well given coming from china delivery was quicker than expected.Hope this helps also there other sellers on ebay selling these analogue meters if hey should run out of stock.
Does the chip mute when shorted on the output? I saw nothing in the application notes to indicate this as a recommended mute function, in fact, there's a 0-2v mute logic pin included for that purpose, and it's generally poor practice to short output terminals, though being chip based it may simply enter protect mode- I just want to confirm before I drill in my switch hole for the build.
Thanks.
Thanks.
No, the shorted output is just to soak up the turn-on transient. If you left the outputs shorted (and played music through the amp for a long time), the chip may enter protect mode. With no signal going into the amp, it will not see the short at the output.
Grainger49
New member
"You never close your eyes any more when I kiss your lips.... You've got that sinking feeling.... That Quicksand sinking feeling."
Couldn't help it.
Couldn't help it.
