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-   -   PCB makers in Bangalore, India (http://www.diyaudio.com/forums/chip-amps/110642-pcb-makers-bangalore-india.html)

nitinbose 24th October 2007 11:38 AM

PCB makers in Bangalore, India
 
2 Attachment(s)
Hi Members,

I require some advice on the following:

I intend to construct a chip amp based on the STK412-170, as shown in the attached pdf.

I would like to know if there are any firms that can make the PCB, as well as the availability of the components mentioned to construct the amp.

awaiting your responses,

Thanks,

Nitin.

gmphadte 25th October 2007 05:22 AM

There are some questions u have to ask yourself...

Why 180 Watts/Ch when 50Watts/ch in a minute is unpleasantly loud when listening in a large living room.

Why STK...
There are so many reasons not to use them except less component count.
A discrete amp will sound much better.
Suppose, somehow u source an STK and then blow it now or later, then u will have to buy one somehow. ICs are never made for long time due to new/better products.
This is never the case with transistors.

enough for now

Gajanan Phadte

kesee 25th October 2007 06:56 AM

I just found this on the web.
very interesting DIY way of making your own pcb
I downloaded it from this web add http://www.fullnet.com/~tomg/gooteepc.htm

Regards KC

nitinbose 25th October 2007 07:35 AM

Hi gmphadte,

Thanks very much for the response.

The main reason for choosing STK is for the less number of external components required.

I do understand that discrete component amplifiers sound even better, but unfortunately, I do not have the time and patience to assemble one.

As for the wattage, I thought of constructing the best possible amplifier, so that I can listen to music at low or moderate volumes with good bass and music quality.

Please let me know if there are any organizations that can make the PCB for me.

Please let me know of good alternatives as well, as you sound more experienced. I'm located at Bangalore as well.

Cheers,

Nitin.

kesee 25th October 2007 07:37 AM

Hi,

If you are planning to build very hi quality chip amp follow the lead on diyAudio Forums > Top >Amplifiers >Chip Amps >LME49810 - a new cousin for LM4702
Check this out I have change little bit of the original design by gmikol [ ]diyAudio Member

gmphadte 25th October 2007 09:27 AM

Quote:

Please let me know if there are any organizations that can make the PCB for me.
Mahesh B.J.
Orion computers
366, 38th cross, opp 21st main,
4th T block, jayanagar,
Bangalore 560 041
India

bj.mahesh@gmail.com
orioncomputers@airtelbroadband.in

Phone- 080-26655442
Mobile- 9886092836

Besides making pcb from your file, they will also design an artwork if u want.
Also their charges are reasonable. (Cheap in International standards)

Quote:

Please let me know of good alternatives as well, as you sound more experienced. I'm located at Bangalore as well.
I am in Goa.
The two nice well documented amps are Symasym and DX amp. Read about them on the forum and decide which one u prefer.
If u ask me, both are good.

Kesee wrote
Quote:

If you are planning to build very hi quality chip amp follow the lead on diyAudio Forums > Top >Amplifiers >Chip Amps >LME49810 - a new cousin for LM4702
Check this out I have change little bit of the original design by gmikol [ ]diyAudio Member
This will be a better choice but not in our part of the world.

Enjoy.

Gajanan Phadte

Edit +/-54V is required for the STK. That makes it 108 Volts. This voltage is considered dangerous and is not for the inexperienced.

linuxguru 26th October 2007 08:57 AM

I'd suggest doing a gainclone/chipamp instead of one based on STK hybrid modules. The TDA7294 is widely available and gives excellent results up to 50W+, and it can be bridged to give about 100W. There's also a Class-G version that can give over 100W. The LM3886 is slightly more expensive, but also gives great results. There are also very good op-amp + power drivers avilable today, like the LM4702/LME49810, which can be used to drive multiple external output power devices to give fairly high output powers (up to 250W is easily within reach).

My personal suggestion is the TDA7294, which is inexpensive (lots of devices can be stockpiled) and for which bare PCBs are readily available.

Paswa 26th October 2007 12:07 PM

if you're unable to make the PCB or unable do find the PCB Maker just to it in veroboard. I've made some high end amps in veroboard and this works very fine. can u tell the cost of the STK412-170 that u purchased coz I wanna make the circuit same :whazzat:

nitinbose 27th October 2007 07:23 AM

2 Attachment(s)
Thanks everone for all the valuable suggestions.

I have not purchased the STK412-170, I'm not sure of its availability in India, though its available online, for about US$30.

I just wanted to be sure of the PCBs and the full availability of all the components before I venture into this project:)

Linuxguru has made a wonderful suggestion of the TDA7294 chipamp. I too have been considering this chip for quite sometime.

A quick question: Would there be any difference in the quality/performance of amps made of monolithic chips, STK modules and discrete components?

Am also attaching the circuit of TDA7294 that mentions a "high efficiency circuit". I could not attach the entire pdf as its too big.

Please suggest if this circuit is good enough.

What is the opinion of assembling a chip amp on a generic PCB?
I believe there may be some instability due to oscillations etc.

Has anyone also come across a circuit that boosts bass & treble as found in some televisions with "super woofer" etc?

Paswa 27th October 2007 07:43 AM

2 Attachment(s)
you can make the high eff. circuit(TDA7294) but it is too complex. But you can make the circuit shown in Fig. 1 in the official datasheet. the PCB layout is also included in the datasheet

please keep my this request, if u buy the TDA7294, please inform me about the cost of that at : paswanath@yahoo.co.in



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