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Old 28th November 2005, 05:06 AM   #21
Jay is offline Jay  Indonesia
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Quote:
Originally posted by sagarverma
what bout your single supply plans?done anything?
Not yet. I couldn't get my 3875 to sound correctly (My ears tell me it is fake) and I couldn't find my 3886s so I have to cancel this one for later. Actually I could locate my 3876s, but they have mute like 3886 with worse spec.

Currently I'm busy with CDP buffer using OPA2134. This supposed to receive signal from TDA1543 avter passive i/v. But still doesn't produce any sound
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Old 28th November 2005, 09:42 AM   #22
aman is offline aman  India
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Default pcb

Hi sagar
thanks for all this information.I bought tda7294 3-4years back i dont know their current price.I will give a try to toner transfer method it would be great if i get success in it and try the nail enamel too...... .For woofers/tweeters u can try Bolton and philips at reliable shops in LR or Bhagirathi mkt or u can use car speakers if u can, I built a 3-way speaker box 4-5 years back and it is working today also. I used philips dome tweeter, a dome midrange and 10" woofer built by one of my friend who build speakers.I too tried to get power toroidal transformers but couldnt find them in retail ,they sell in bulk,however i use EI transformers only from GURU shop.For car smps toroidal cores i get them from MBK Enterprises in LR Mkt. I hope u can get info abt power toroids from them but not sure........
I am looking for the bass ckt plz wait.....
I live in Dwarka and i hope i have replied every question......

Aman
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Old 28th November 2005, 12:25 PM   #23
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Quote:
I am looking for the bass ckt plz wait.....
i m waiting............

plz tell me shop numbers of good repute in your eyes i.e tried and tested.


philips tweeters!!!!from where?genuine?
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Old 29th November 2005, 05:24 AM   #24
aman is offline aman  India
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Default bass ckt

Hi sagar,
here's the ckt. there are two shops in LR mkt which sell philips speakers. u can ask there anyone,one number is i think 416 from where i bought the dome tweeters were very cheap Rs 300/pair and they r working still now.
www.freeinfosociety.com/.../ schemview.php?id=97
u can use tl072 for making a pair of bass amps
pin 2 is (-)input with 10k resistance
pin 3 is (+)input which is grounded
pin 1 is output for ur amp input
pin 8 positive supply
pin 4 negative supply
the ckt can be built on veroboard very nicely
hope it would help
regards
Aman
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File Type: gif bassamplifier[1].gif (3.6 KB, 887 views)
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Old 29th November 2005, 01:14 PM   #25
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hi aman,
thanks for that.
lemme see if it works for me.

philips tweeters genuine??

torroid transformers not cores.?where to get in delhi?

did u try toner transfer?

should i use this bass amp as my main preamp i.e o/p from discman into this ckt and then to amp?
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Old 29th November 2005, 02:55 PM   #26
aman is offline aman  India
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Default bass ckt

Hi sagar
the ckt will definitely work perhaps without the need of a preamp.I couldnt find power toroids in delhi...sorry.I am not confirmed abt my tweeters.I didnt try toner method. Too busy these days.
regrds
aman
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Old 6th December 2005, 06:36 AM   #27
aman is offline aman  India
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Default bass ckt/pcb

Hi sagar,
hows the bass ckt working?? did it help u in any way??
I used the toner transfer method. I couldnt get the hp/kodak photopaper only CENTURY(very thick) was available for 7/- each and i used it and it worked but a few pin holes were not transfered well , i corrected it with paint........ and etched it another day. It was quite good,i tinned it and populated with components and will test it someday(SymAsym).
Any suggesstions....................
regrds
Aman
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Old 6th December 2005, 07:08 AM   #28
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Quote:
i tinned it
how?
liquid?tell me plz

go to nehru place for hp.

century bundle can be got from there for Rs3 or so per sheet.(papers i told ya will result in seamless transfer)

bass ,will try it when free.
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Old 6th December 2005, 08:48 AM   #29
aman is offline aman  India
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Default tinned

hi sagar
ohhhhhhhhh... yaar sagar,sorry if u misunderstood.
I just used good quality soldering wire and 35watt solder and went over all the pcb tracks.
Thats all and no liquid at all.....
regrds
Aman
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Old 6th December 2005, 01:50 PM   #30
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Default Re: tinned

Quote:
Originally posted by aman
hi sagar
ohhhhhhhhh... yaar sagar,sorry if u misunderstood.
I just used good quality soldering wire and 35watt solder and went over all the pcb tracks.
Thats all and no liquid at all.....
regrds
Aman

do u know bout solution or what is it called in the market lingo at l.r market?

do u know bout any pcb maker person?one who can construct professional pcb's with masking and overlay etc(in India).

or

do u know bout the place where i can get all pcb related maal like mask,overlay transfer,tinning solution chemical,fiber board pcb etc?where can i get double sided boards?

by the way,do u also use epoxy boards or u have fiber boards?
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