Pass B1

[KiranPS]

Mr OMishra,

When I drive the Arduino with the PS board's secondary output (+15,0,-15), The regulator is getting very hot, I had set the output voltage to 9v, I guess its because of the big voltage difference between the input and output. Is it a better option to have a secondary power supply (12-0-12) for the arduino ? Will using a 5V SMPS board introduce noise ?

Warm Regds,
Ravi Kiran.

 

[omishra]

Mr OMishra,

When I drive the Arduino with the PS board's secondary output (+15,0,-15), The regulator is getting very hot, I had set the output voltage to 9v, I guess its because of the big voltage difference between the input and output. Is it a better option to have a secondary power supply (12-0-12) for the arduino ? Will using a 5V SMPS board introduce noise ?

Warm Regds,
Ravi Kiran.

Yes, that voltage difference contributes to heat. If you need 9V output then it would help 9-12V secondary. Also add some U shaped heatsink. SMPS introduces switching noise which affect ground floor noise.

 

[KiranPS]

Thanks Mr Mishra,

I have added a secondary 0-12v power supply and this took care of the issue.

Warm Regds,
KiranPS.

 

[quad]

All,

I just completed my OPS + Pass B1 + CNC phono + source selector.
It is housed in the superb cabinet provided by FM Raghunath.
Front panel is home made from a piece of Alucabond which is used for facade of buildings. I picked it
up from scrap discarded outside a new commercial building.
Raghu's chassis has a hole at the back for an xlr type power socket. I used an old blown prestige pressure cooker safety valve to plug
that hole.

Thanks to everyone behind this - everything is working great.
It is dead quiet - in fact, I initially thought it was not working!!

For the feet, I am using a cheap item (Rs 45) from a local glass/plywood shop.
It is a Round (Diamond or crystal type) Mirror Bracket.

http://2.imimg.com/data2/JM/LF/MY-2769667/mirror-bracket-diamond-500x500.jpg
Cyrstal Mirror Bracket Full (Dabi) - Cyrstal Mirror Bracket Full (Dabi) Manufacturer & Supplier, Jamnagar, India
http://krishnaindustriesrajkot.com/header/ss_diamond_mirror_holders.jpg

 

[TheCoolestOne]

Quad, very neat work. The cabinet especially the front panel looks splendid indeed.

 

[sachu888]

Nice build :clapping: Did you like the SQ?

Regards,
Sachin

 

[linuxguru]

Front panel is home made from a piece of Alucabond which is used for facade of buildings. I picked it
up from scrap discarded outside a new commercial building.
...
For the feet, I am using a cheap item (Rs 45) from a local glass/plywood shop.
It is a Round (Diamond or crystal type) Mirror Bracket.

Great work - the front panel and the feet are excellent improvisations. Is that Alucabond easy to work on with just say a hacksaw, file, electric hand drill and emory paper?

I'm using really cheap feet (white moulded polycarbonate bushings available at electrical/hardware shops for ~Rs.3 each) now, but they're just bolted on and can be replaced any time. They're also available in a larger diameter (~40 mm) version that could in principle be painted black or bright silver if needed. These are also perfect replacements for the feet of older Baby AT and ATX PC cases which have ~6mm drilled holes for push-fit plastic feet (which tend to break over time).

 

[quad]

Great work - the front panel and the feet are excellent improvisations. Is that Alucabond easy to work on with just say a hacksaw, file, electric hand drill and emory paper?

Extremely easy to work with. I was working with just a hand drill (not even power
drill), and even made countersink holes at the back so the front
panel is flush, hiding the nuts of the selector switch and volume control.
Alucabond is about 6mm thick resin, with a thin metal cladding on both sides.
It was fun and fast to work with, cheap (free!!) with great results.

 

[quad]

Nice build :clapping: Did you like the SQ?

Regards,
Sachin

B1 is too good. CNC too. Glad I finally built it

 

[nraghunadh]

Neat build, Faceplate looking very nice. .. :clapping:


Thank you
Raghunadh

 

[Anil kumar]

Neat work

 

[omishra]

Beautiful build and nice cabinet from Raghunadh. Good thing is that Raghu provided threaded spacers for mounting general PCB for selector LEDs. great idea.

 

[captrajesh]

Superb looking preamp. If paired with a right power amp, will sound like million bucks too.

 

[AmitKumar]

Hi Quad,

This has come up very well and looks very neat.

That cabinet from Raghunadh is also very nice.

You are going to pair it with which power Amp?

 

[Santy]

Wow nice work Prasad.
Great cabinet too.
Congrats.

 

[quad]

Hi Quad,

This has come up very well and looks very neat.

That cabinet from Raghunadh is also very nice.

You are going to pair it with which power Amp?

Thanks!
I am using a diy tube amp similar to the Dynaco ST70.

 

[captrajesh]

I am using a diy tube amp similar to the Dynaco ST70.

Quite an interesting pairing. Which speakers are you driving them with? Does the amp use EL34s or KT88? (in PP mode I guess)

 

[quad]

Quite an interesting pairing. Which speakers are you driving them with? Does the amp use EL34s or KT88? (in PP mode I guess)

Yes, quad of KT77 in a push pull config. Speakers are Fostex FE206 in a Sachiko cabinet.

 

[omishra]

Insite of yet another Pass B1, completed yesterday. This is using Resistance Ladder 23 step volume control - 47K?. I am utilizing dual power supply output for external phono pre amplifier.

This is how I connected source selector LEDs from backside.

Now playing nicely into my rack.

As always testing this as clean and silent pre-amplifier. I will try to get hold on another Pass b1 kit to make this another double Decker which is my liking. But this is still cleanest preamp.

Thanks Raghu for cabinet help.

Thanks

 

[AmitKumar]

This has come up very well, that wooden front is looking great. Not able to make out of the wooden front is allready polished or the same needs to be done.