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Old 31st October 2005, 04:07 AM   #1
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Default car preamp with artificial earth(ESP)

anyone made car preamp with a.e from esp site.

suggest improvements.

i m setting gain at 3.

how is performance?is it worth?

advise please.
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Old 31st October 2005, 04:10 PM   #2
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preamp done

any advise on how to inc the low freq resp. in the ckt itself so that the bass is heavy throughout the spectrum.
can preamp b modified ad-hoc or do i require a seperate ckt for the purpose.advise plz
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Old 31st October 2005, 04:56 PM   #3
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Default Re: car preamp with artificial earth(ESP)

Quote:
Originally posted by sagarverma
anyone made car preamp with a.e from esp site.

suggest improvements.

i m setting gain at 3.

how is performance?is it worth?

advise please.

Can you post a link or attach the schematic?
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Old 1st November 2005, 05:45 AM   #4
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hi to3

thanks for reply

link is

http://www.sound.westhost.com/project32.htm

i have done it totally.though the pcb has provision for a.e circuitary also,i havent used it.

plz suggest the req mods to serve my desired purpose.
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Old 1st November 2005, 03:12 PM   #5
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Here are a couple things you can do. If you are confident in the circuitry before this circuit, remove C101, 102, 201, 202, or change them to polypropelyene. Never use electrolytics in the signal path. This will give you more bass as the electrolytics block those desired lower frequencies.

Another thing you can do is use good opamps. Using audio grade opamps will increase your signal-to-noise and lower your THD substantially. I always use AD 823s for my audio. These run about $4.50USD each, but they are dual channel and I think the AD821 or 822s are the singal channel version. But a good part is the Burr-Brown OPA2134(dual) or OPA134(singal) and they cost about half as much as the Analog Devices parts, but are still a much better choice then those horrible TL072s.

Here's a link to the Burr Brown devices:
http://focus.ti.com/docs/prod/folder...t/opa2134.html
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Old 1st November 2005, 07:13 PM   #6
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hi to-3

how much do tlo72 cost u.it will help me do comparison bec i got 20 of them here at Rs12 per peice.opa2134,i suppose will suffice bec i have heard many a praises bout them.$2.25 as u sayin they cost,it equates to bout Rs100.very costly bec i got lm series amp chips for this price!!so tell me that r opa's worth the price.if they have excellent performance then i will buy them for pamp.tell accordingly

how bout ne5532?good or not?

i have used tl02 in lr xover from esp site.the filter works brilliantly.the opamps operate at unity gain so no cause of concern even if u use prehistoric 741.
****tl072 is a good ic,dont call it bad( i got 20 of them:-)****

one point,are such vaues as 10 or 100 uf available in polypropylene?i doubt.even if they r they would b very huge and very costly.if they really have the performance to justify the bulk they carry,only then i should go for them.reply accordingly.

thanks in advance
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Old 1st November 2005, 08:07 PM   #7
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Quote:
Originally posted by sagarverma
hi to-3

how much do tlo72 cost u.it will help me do comparison bec i got 20 of them here at Rs12 per peice.opa2134,i suppose will suffice bec i have heard many a praises bout them.$2.25 as u sayin they cost,it equates to bout Rs100.very costly bec i got lm series amp chips for this price!!so tell me that r opa's worth the price.if they have excellent performance then i will buy them for pamp.tell accordingly

how bout ne5532?good or not?

i have used tl02 in lr xover from esp site.the filter works brilliantly.the opamps operate at unity gain so no cause of concern even if u use prehistoric 741.
****tl072 is a good ic,dont call it bad( i got 20 of them:-)****

one point,are such vaues as 10 or 100 uf available in polypropylene?i doubt.even if they r they would b very huge and very costly.if they really have the performance to justify the bulk they carry,only then i should go for them.reply accordingly.

thanks in advance
Just to give you an idea of the differences:

THD @ 1kHz with Rload= 2k ohms
TL072= .01%
OPA2134 = .00008%

Input noise margin @ 1kHz:

TL072 = 15nV/sqrt(freq)
OPA2134 = 8nV/sqrt(freq)

So the TL072 has almost twice the amount of noise.

I found these prices on www.digikey.com
TL072= $0.65
OPA2134 = $2.63

As for the NE5532, it costs around $0.80 and has low input noise, however. Unlike the other two, this can only swing +/-15V and the slew-rate is rather weak 9V/us(at unity), while the other two are 15V/us and better respectively. I would say no to that part.

Polypropelynes are usually larger than electrolytics. If you are confident in your other components, just lose the caps altogether. You will get less phase distortion, but at the cost of passing direct current through your circuit.
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Old 2nd November 2005, 05:26 AM   #8
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from your suggestions,i can deduce that switching over to opa2134 is really a good choice.
it will cost much less out here.in bulk much less:-)
will change over to this chip on monday or so and will post the result.

what bout the bass boosting?any good tried and tested ckt?
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Old 2nd November 2005, 03:08 PM   #9
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Quote:
Originally posted by sagarverma
from your suggestions,i can deduce that switching over to opa2134 is really a good choice.
it will cost much less out here.in bulk much less:-)
will change over to this chip on monday or so and will post the result.

what bout the bass boosting?any good tried and tested ckt?
I don't have any circuits, but after you ops in the circuit I am sure you will be pleased by the difference in sound.

I have a real project I need to get to someday. I have a PPI DEQ-230, a 1/3 octave crossover that I need to modify. I want to replace all of the crappy quad ops to some nice ones. The only thing that is stopping me is the cash. It has been awhile since I looked at the board, but there are at least 15 quads to replace.
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Old 2nd November 2005, 04:51 PM   #10
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hi to3
see this.is it worth??

http://www.sound.westhost.com/project28.htm

know anything more(practical) bout simulated inductors.i read in details bout them in my 2nd year(final year elect. n comm. engg.).
but that was all theory with derivations etc.i need the practical day to day usage and performance info.any idea or link?

i didnt understand parametric equaliser.parametric amp was in syllabus too but i never bothered to read it then.any info bout it too.

see it if any improvements possible.


advise::
in your xover,r the opamps operating at unity gain????if its that then forget bout changing the ics bec NO IMPROVEMENT will b there.if the ics have gain,only then change.
-----------------------------------------------------------------------------
calculations
::::quads:unit price=Rs350 approx.for 15 its approx Rs5000=price of a good sony amp.but here,quads will cost 1/5 or less of what u pay.dunno y but its a pleasant reality
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