Choke specs for the Crack

[Paul Birkeland]

Add a 100 Ohm 3W resistor as a series component in the power supply to drop the voltage that the 193C doesn't.

This is kind of a moot point though, finding a place to mount that choke will be the tough part.

 

[modestmeowth]

Add a 100 Ohm 3W resistor as a series component in the power supply to drop the voltage that the 193C doesn't.

This is kind of a moot point though, finding a place to mount that choke will be the tough part.

I'm working on making a different base plate and box, something along the line of 12" x  12". Couldn't I mount the choke up top if I go this route?

 

[Paul Birkeland]

Yes indeed.

 

[modestmeowth]

Yes indeed.

Just to clarify before I order, I want two right?

 

[Paul Birkeland]

Yes indeed.

Just to clarify before I order, I want two right?

I don't know, I could see situations where 1, 2, or 3 of these chokes could be used.  The specifics are up to you.

 

[NightFlight]

http://ca.mouser.com/ProductDetail/Triad-Magnetics/C-7X/?qs=%2fha2pyFaduhbeVQomtZQm6Wo19J3RkQe24jRzwLg5Ow%3d

I just wanted to point out that new Triad C7X are available from mouser for $CAN 13.79. That is about the 1/2 the price as seen posted on ebay earlier in this thread. Possibly cheaper shipping too.  From a reputable seller like mouser its a better deal all around.

 

[mcandmar]

Whats the difference between the new and old?

 

[JamieMcC]

http://ca.mouser.com/ProductDetail/Triad-Magnetics/C-7X/?qs=%2fha2pyFaduhbeVQomtZQm6Wo19J3RkQe24jRzwLg5Ow%3d

I just wanted to point out that new Triad C7X are available from mouser for $CAN 13.79. That is about the 1/2 the price as seen posted on ebay earlier in this thread. Possibly cheaper shipping too.  From a reputable seller like mouser its a better deal all around.

Whats the difference between the new and old?

Not sure if its a new version myself they look to be the same the specsheet Mouser link is dated 2006.

The Ebay ones I expect are brought in baulk wholesale most probably from Mouser and then just marked up for retail.

 

[NightFlight]

Ordered mine early Wednesday morning from Mouser with other goodies. Received it Thurdsay afternoon at my work. That's from TX to Ontario Canada. Amazing turnaround.

Stuffed it in my Crack (lol) last night and heard it briefly. I used a couple 1" standoffs and I almost accidentally drilled through my transformer, but its in!  I had to turn it off right away because it was 1am and I would have been there all night.  This morning there is yet again more prat coming out of the PS and I swear its digging deeper for detail.  Its worth it.

 

[williaty]

Hi all, just wanted to say thanks to all those who helped hold my hand with the choke installation details and share a couple of pics of how its turned out. Keeping the fasteners out of sight behind the transformer worked well I intend to go back over the connection with some better insulation or shrink wrap to make the connections look a bit more tidy at a later date.

While it's the chokes I'm mostly interested in, what are you doing with the circuit that allowed you to use such small output coupling caps? I thought going that small would raise the lower -3dB point to a problematic degree.

 

[Paul Birkeland]

While it's the chokes I'm mostly interested in, what are you doing with the circuit that allowed you to use such small output coupling caps? I thought going that small would raise the lower -3dB point to a problematic degree.

Those are 10uF caps in parallel with some other caps.

-PB

 

[JamieMcC]

Not sure how to answer that myself but there is a  graph on the forum somewhere that showed how the Cracks 3dB point changes by interpolating different capacitor uf values with differing headphone impedances which was quiet interesting. Perhaps someone will remember where it was posted.

 

[EarWorm]

Is this the chart?

 

[i luvmusic 2]

I just want to make sure that this is the right choke (C-7X) for the Crack before i ordered them.Thanks!

 

[Grainger49]

Yes that is it.

 

[i luvmusic 2]

Thank You!

 

[Jimb0]

Does the choke need to be mounted away from the chassis or can I use velcro to secure it right on it?

 

[Strikkflypilot]

I believe it is a good thing to ground the choke metal.

 

[Grainger49]

Others have mounted the choke on standoffs under the top plate.  A look through the Gallery folder or in the Crack folder will yield a number of pictures.

The choke needs to be a way from other inductors, like the transformer, to keep it from picking up hum.

Yes, it needs the frame, mounting screws, tied to the safety ground.

 

[Jimb0]

Thanks guys. The standoff idea seems like a good method. Will run to home depot tomorrow to pick up a couple 

James