LM2574 Regulated Power Supply

[tiger0691]

For Multi Purpose Power Supply,
I am going to assemble LM2574 Regulated Power Supply.

This is the PCB

 

[tiger0691]

24V Trans (24-0-24, 5A)
It was Rs. 215 in Chandni Chawk yesterday.

 

[tiger0691]

LM2574 & other parts

 

[tiger0691]

Start soldering

 

[ranjeetrain]

Good to see your DIY work! Do you do it all yourself or do your friends back home give you tech support? Any plans to start a linear power supply project?

 

[saheb11123]

Neat build.
The trannies are so cheap, a regular 20-0-20 5 amps tranny costs around rs600 back here.


Keep up the diy work

 

[tiger0691]

Good to see your DIY work! Do you do it all yourself or do your friends back home give you tech support? Any plans to start a linear power supply project?

I am not able to do all by myself.
My friends support me.

I also have keen interest in linear power supply.

 

[tiger0691]

Completed!
It is only step down regulaltor.
24V input, 21V out supply is ready for Hybrid Headphone Amp
and it can be used TPA 3116 small amp

 

[tiger0691]

Neat build.
The trannies are so cheap, a regular 20-0-20 5 amps tranny costs around rs600 back here.


Keep up the diy work

In Chandi Chawk, there are many manufacturers
Though quality is not good, we can have some options
This trans gives lot of heat:sad:
Better go for Chinese Troidal Trans.

 

[saheb11123]

In kolkata's chadni chowk you can only get el traffo's . I already told you the cost, these are standard of the shelf product. There are other traffo provider's here too, like you said either they produce heat(a lot) or they(like in my case) generate a distinct odor.
There is a option of custom made traffo but the costing increases for that.

 

[saheb11123]

BTW, how much is the current draw?

 

[quad]

In Chandi Chawk, there are many manufacturers
Though quality is not good, we can have some options
This trans gives lot of heat:sad:
Better go for Chinese Troidal Trans.

Nice work.

Chinese Toroidals - are they available in local market? or ebay?
Where did you get the PCB and components for this supply?

 

[tiger0691]

Nice work.

Chinese Toroidals - are they available in local market? or ebay?
Where did you get the PCB and components for this supply?

When I check it is not available in Delhi local market. (I found but expensive than web)
On the web, it is not cheap.

Toroid transformers for audio amplifiers buy online

 

[tiger0691]

BTW, how much is the current draw?

Trans : 5A X 2
Circuit : Max 3A
With loading (TPA 3116 Amp) : 1.5~2 A

I don't know why this trans gives heat with less loading.

 

[omishra]

Trans : 5A X 2
Circuit : Max 3A
With loading (TPA 3116 Amp) : 1.5~2 A

I don't know why this trans gives heat with less loading.

Because to save copper its coils are bare minimum #turns in primary and ratio of primary:secondary maintained. So inductance is on lower side. The core material & stack build is putting lot of magnetic resistance to field and loss is dissipated into heat.

 

[reubensm]

Start soldering

Nice soldering station, where did you get that from?

 

[tiger0691]

Nice soldering station, where did you get that from?

It is available in Chadni Chawk, Delhi.
The price I remember is Rs. 700.

I needed it for my eyes(presbyopia):sad: