DIY: Pass F5 turbo v2 initiated

[sachu888]

sachin, I have sent you a PM, please check

Hi Sajith,
PM replied.

Regards,
Sachin

 

[captrajesh]

I request to members to clear their dues(pl ignore if paid) in 4-5 days.

I suggest you list handles of all the participants along with a list of those who paid.

It is also a good idea to ask for the mail ids and mobile nos to open multiple channels of communication as some may be busy/ out of station/country and may not be logging into the the forum.

 

[pdhanwada]

I am looking at this website for chasis mounted Fuses.

Chassis Mounting Fuses Holders

Like the cfh-1 type of fuse mount.

Need fuse values for fast blow during testing and slow blow fuses for sustained use.

I want to use two fuses one per each channel.

Per NP SLow blow needed would be 1.25 amp meaning .625 per channel

Fast blow would be 1 amp meaning .5 amp per channel.

Please confirm.

Thanks

 

[nraghunadh]

Pandu,
You can get below chassis mount fuse holders from KOTI(Hyderabad) , and as well slow blow fuses. There are different sizes.
5 x Fuse Holder Chassis Panel Mount for Glass Tube Fuses 5 x 20mm Case 15A 10A | eBay

Thanks,
Raghu

I am looking at this website for chasis mounted Fuses.

Chassis Mounting Fuses Holders

Like the cfh-1 type of fuse mount.

Need fuse values for fast blow during testing and slow blow fuses for sustained use.

I want to use two fuses one per each channel.

Per NP SLow blow needed would be 1.25 amp meaning .625 per channel

Fast blow would be 1 amp meaning .5 amp per channel.

Please confirm.

Thanks

 

[omishra]

Pandu,
You can get below chassis mount fuse holders from KOTI(Hyderabad) , and as well slow blow fuses. There are different sizes.
5 x Fuse Holder Chassis Panel Mount for Glass Tube Fuses 5 x 20mm Case 15A 10A | eBay

Thanks,
Raghu

Yes this is good one. This is same as Raghu pointed out, holds fuse of 5mm X 20mm.

For each 300VA toroidal you have to put 1.25A slow blow fuse. For two you have to use 2.5A fuse.

But for initial Power Supply Testing - use 100W filament bulb in series of each transformer primary. Continuous glowing bulb means some problem and just sudden 1/2 sec flash means okay.

 

[quad]

It may be good to add in a NTC thermistor based slow start circuit like this one -

Controlling the Inrush Current Required by Large Transformers
Inrush Current FAQ

 

[1MOR]

I found 2A slow blow fuse worked well for my F5 build. I used a 400 VA transformer and thermistor delay per Pass's PS design. I tried to use 1A slow blow fuse when testing the PS with negative results. Mains supply here is
120V.

Again, this was for a F5 build, not the F5T. Hope this is of some help.

 

[pdhanwada]

As I understand, Mor1 is talking about the same thing what Quad is mentioning in the previous post.

So per Pass design schematic, we do have the relay mechanism in there.

 

[omishra]

As I understand, Mor1 is talking about the same thing what Quad is mentioning in the previous post.

So per Pass design schematic, we do have the relay mechanism in there.

Pandu, there is no relay in Pass design. We have included two 10ohm NTC for two toroidal transformers and another two for ground isolator bridges. So total 4 are there. I will be publishing this for everybody.

 

[pdhanwada]

check the post # 12639

Intresting and innovative implementation of Heat sink.

F5 power amplifier - Page 1264 - diyAudio

 

[quad]

check the post # 12639

Intresting and innovative implementation of Heat sink.

F5 power amplifier - Page 1264 - diyAudio

Thanks for the link. The active cooling heatsinks which I posted
about sometime back should be similar.
There is a pic on the net somewhere where someone used an
aluminum flywheel from a scooter engine as a heatsink.
For the F5T, it may need to use an entire V-twin cylinder head

 

[pdhanwada]

Thanks for the link. The active cooling heatsinks which I posted
about sometime back should be similar.
There is a pic on the net somewhere where someone used an
aluminum flywheel from a scooter engine as a heatsink.
For the F5T, it may need to use an entire V-twin cylinder head

I remember your post. Wanted to share the practical implementation.

Thanks

 

[anilva]

Some pictures of my F5T v2 chassis which came back from anodizing and powder coating. The chassis and the heatsink costed me around 14000/-. The build is turning out to be not a small investment...

Each side has two heatsinks with fins aligned vertically and both of them are thermally coupled by a nickel plated copper flat to ensure thermal balance between both the heatsink elements.

Cheers.

 

[sachu888]

It looks like commercially made :thumbsup:,very nice:clapping:

Regards,
Sachin

 

[Audiodoc]

Looks great however price is almost equivalent to commercial available ones. Great DIY enclosure though.

 

[omishra]

Looks great however price is almost equivalent to commercial available ones. Great DIY enclosure though.

But what about material? IMO this is very heavy and little bigger compared to those. Isn't it?

 

[anilva]

But what about material? IMO this is very heavy and little bigger compared to those. Isn't it?

There are very few commercially available cabinets (including ones available in china/USA) which have these size of heatsinks.

The empty chassis with heatsink is measured at 25 KGs. It will touch atleast 30-35 KGs I guess with the transformer and 16 large capacitors.

Cheers.

 

[GeorgeO]

Looks good Anil

And can one fry eggs on those once they are suitably warmed up?

 

[anilva]

Looks good Anil

And can one fry eggs on those once they are suitably warmed up?

Ofcourse you can fry, but only once, post which the amp will never turn on.

 

[Audiodoc]

Yes this one in quiet hefty at 25 kg. The ones available in this price range are around 15 kg only. Maybe good for a pass 5 not for the turbo.

By the way one can try a frying pan to fry eggs, seen some people doing so with their class A amps. Atleast this baby will help in keeping us warm though the winter.