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Old 3rd December 2012, 07:51 AM   #351
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Quote:
Originally Posted by gmphadte View Post
Use NE5532

Read op amp cost

Gajanan Phadte
@Gajanan Phadte
Thanks for your kind reply, the NE5532 (or JRC2068D) will be used for gain stage
- but JRC4556 (100mA peak current into 150R) is simply double of NE5532(50mA peak into 600R). The JRC4556 are needed to drive h/p as low as 16 Ohms.SOIP JRC4556 are available in Mumbai but they get hot above +/- 7V.

availlyrics

Last edited by availlyrics; 3rd December 2012 at 08:10 AM.
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Old 4th December 2012, 03:51 AM   #352
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Location: Dona paula, Goa
Don't bother to search for JRC4556, not worth it. Anyhow, these r dual 741s, so just buy two metal can 741s of good specs/mfr and fix it on a dummy ic socket.

Gajanan Phadte
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Old 6th December 2012, 09:50 AM   #353
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Quote:
Originally Posted by Roushon View Post
Yes, that is the main problem. Spent a lots of money, time and energy behind the
open baffle and using it without any grill. Afraid one of these days the maid will poke the drivers with the broom...
Haa.. sahi bola, Agar kisi din maim sahab se panga hua, to gussa yaha pe niklega...
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Old 6th December 2012, 10:05 AM   #354
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Quote:
Originally Posted by availlyrics View Post
@Gajanan Phadte
Thanks for your kind reply, the NE5532 (or JRC2068D) will be used for gain stage
- but JRC4556 (100mA peak current into 150R) is simply double of NE5532(50mA peak into 600R). The JRC4556 are needed to drive h/p as low as 16 Ohms.SOIP JRC4556 are available in Mumbai but they get hot above +/- 7V.

availlyrics
Can you share the circuit diagram with us, so it would be easy to suggest you.
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Old 6th December 2012, 10:07 AM   #355
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You could place a reasonably open metal mesh over the drivers. If made well it will not detract from the looks or performance. I've seen dented dome tweeters cause by the maid moving the speaker around to clean the floor. The cloth grille was on and she had no idea where her fingers were placed. Luckily the owner pulled it our reasonably well with a vacuum cleaner ( carefully!) and is happy that it's been 'fixed'. You can still see some faint creases on the ( cloth) dome. Obviously he is not an audiophile !
But a speaker attack by the 'better half' would be permanently damaging !
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Old 6th December 2012, 10:17 AM   #356
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AD8273ARZ Analog Devices | Current Sense Amp Dual18V | 709-7095 | Welcome to RS Online

Check If you can configure this Op-amp for your need.
Attached Files
File Type: pdf AD8273.pdf (390.6 KB, 0 views)
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Old 7th December 2012, 03:15 AM   #357
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Quote:
Originally Posted by Roushon View Post
Yes, that is the main problem. Spent a lots of money, time and energy behind the
open baffle and using it without any grill. Afraid one of these days the maid will poke the drivers with the broom...
I clean my own room as I prefer no grill/mesh/cloth spk. setup. No one else is allowed to clean - seriously
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Old 7th December 2012, 03:27 AM   #358
Roushon is offline Roushon  India
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Default Speaker building raw materials

Hi All,
Thanks for your advices and sharing real life experience. I finally found a website (suggested in some other forum) where one can get things for speaker building. It was very comforting to see this web shop. Here it is:

diyaudiocart

Hope it helps people who likes to shop on the web sitting in the comfort of home/office (like me).

Roushon.
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Old 7th December 2012, 04:06 AM   #359
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Quote:
Originally Posted by Aucosticraft View Post
Can you share the circuit diagram with us, so it would be easy to suggest you.
I've been following nwavguy's blog for quite some time(He has stopped updating from last May 2012 though). The objective analysis & measurements plus comments are very exhaustive & in depth but at the same time very "enlightening". A must read for all DIYers.

For detailed explanations-
NwAvGuy: O2 Details

Dispelling opamp myths-
NwAvGuy: Op Amps: Myths & Facts

Objective measurements of different opamps-
NwAvGuy: Op Amp Measurements

nwavguy a.k.a. RocketScientist thread-
The Objective2 (O2) Headphone Amp DIY Project

I've got PCBs for the same from jtkam at diyaudio.(a kind DIYer from Canada who has given away more than 100 PCBs free all over the world with the only condition that 5$ per PCB be donated to diyaudio.com & a postcard to him. Well that might explain my "single star" status)

If any body in Mumbai wants to hear this headphone amp(I'm going to build with smd JRC4556 for the time being), they can PM me.

Thanks,
availlyrics
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File Type: png nwavguy o2 schematic 30aug11[3].png (165.0 KB, 54 views)
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Old 7th December 2012, 04:35 AM   #360
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Headphone amp based on a DRV134 driver ic would sound much better than this.

Gajanan Phadte
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