Gday
I want to obtain a 4db output from a normal soundcard(about -15db or something) Does anyone know how to do this, and cheaply. I am on a tight budget and i didnt even know until two days ago that pro equipment ran at 4db, now i have spent $212au on a power amp i find i need to buy a mixer or something. Please help.
Daniel
I want to obtain a 4db output from a normal soundcard(about -15db or something) Does anyone know how to do this, and cheaply. I am on a tight budget and i didnt even know until two days ago that pro equipment ran at 4db, now i have spent $212au on a power amp i find i need to buy a mixer or something. Please help.
Daniel
Hi Daniel,
I think it is -10dB out from your soundcard and in this case it´s 14dB up to get +4db out.
There are a lot of semipro to pro level interface on the market in varying price range, but one nice I have use a lot are Radio Design Labs "flat-pak range" type: FB-UBC2 unbalanced to balanced converter (input RCA connectors and output XLR connectors) and have adjustable gain from -5 to +10 dB balanced output in 600 ohms.
I think you can get it from the mostly pro-audio dealers.
If you have audioelectronics as a hobby you can easy build a own, tell me if you want some tips for this.
-Bo Hansén, Gothenburg, Sweden
I think it is -10dB out from your soundcard and in this case it´s 14dB up to get +4db out.
There are a lot of semipro to pro level interface on the market in varying price range, but one nice I have use a lot are Radio Design Labs "flat-pak range" type: FB-UBC2 unbalanced to balanced converter (input RCA connectors and output XLR connectors) and have adjustable gain from -5 to +10 dB balanced output in 600 ohms.
I think you can get it from the mostly pro-audio dealers.
If you have audioelectronics as a hobby you can easy build a own, tell me if you want some tips for this.
-Bo Hansén, Gothenburg, Sweden
reply -
Yes that would be very good, i found that i had a yamaha souncard lying around, but it is pretty lousy although it does have a strong output. The amp i have got takes XLR sockets unbalanced. SO id need a converter from RCA to XLR (or that large headphone socket) but it needs to be unbalanced. if you could send me any cicuits of how to do this thatd be great!!
Thanks
Daniel
Yes that would be very good, i found that i had a yamaha souncard lying around, but it is pretty lousy although it does have a strong output. The amp i have got takes XLR sockets unbalanced. SO id need a converter from RCA to XLR (or that large headphone socket) but it needs to be unbalanced. if you could send me any cicuits of how to do this thatd be great!!
Thanks
Daniel
i had a look at the product
Input impedance: 10 kOhm
Input configuration: Unbalanced
Output impedance: 150 Ohm balanced, drives 600 Ohm or 10 kOhm lines
Output configuration: Balanced or unbalanced - - - wow!!!
Frequency Response: 20 Hz to 40 kHz (+/- 0.25 dB)
One of these would be great, however i betcha itd cost an arm and a leg, if you know how to buil one anything like this id love to know.
Thanks
Daniel
Input impedance: 10 kOhm
Input configuration: Unbalanced
Output impedance: 150 Ohm balanced, drives 600 Ohm or 10 kOhm lines
Output configuration: Balanced or unbalanced - - - wow!!!
Frequency Response: 20 Hz to 40 kHz (+/- 0.25 dB)
One of these would be great, however i betcha itd cost an arm and a leg, if you know how to buil one anything like this id love to know.
Thanks
Daniel
i had a look at the product
Input impedance: 10 kOhm
Input configuration: Unbalanced
Output impedance: 150 Ohm balanced, drives 600 Ohm or 10 kOhm lines
Output configuration: Balanced or unbalanced - - - wow!!!
Frequency Response: 20 Hz to 40 kHz (+/- 0.25 dB)
One of these would be great, however i betcha itd cost an arm and a leg, if you know how to buil one anything like this id love to know.
Thanks
Daniel
Input impedance: 10 kOhm
Input configuration: Unbalanced
Output impedance: 150 Ohm balanced, drives 600 Ohm or 10 kOhm lines
Output configuration: Balanced or unbalanced - - - wow!!!
Frequency Response: 20 Hz to 40 kHz (+/- 0.25 dB)
One of these would be great, however i betcha itd cost an arm and a leg, if you know how to buil one anything like this id love to know.
Thanks
Daniel
Here is an RDL product that already has the I/O jacks on it: RU-LA2D This is a little bit more money than the Flat-Pack, but it does have the jacks. This is a great sounding piece. If you need to do this on a smaller budget, try the Ebtech : LLS-2 .This still does a decent job and won't break the bank.
If you are handy with electronics, you can easily build a basic circuit around the BB DRV134 to balance your circuit and feed your amplifier.
Cheers,
Zach
If you are handy with electronics, you can easily build a basic circuit around the BB DRV134 to balance your circuit and feed your amplifier.
Cheers,
Zach
Daniel,
What soundcard do you have ? - quite a lot of cards can get this sort of level (Soundblaster etc). However, changing a few resistors on the card could very well do the job.
Also, what power amp have you got? - some use pin3 hot on the XLR, whilst others use pin 2
Cheers
What soundcard do you have ? - quite a lot of cards can get this sort of level (Soundblaster etc). However, changing a few resistors on the card could very well do the job.
Also, what power amp have you got? - some use pin3 hot on the XLR, whilst others use pin 2
Cheers
Remember that +4dBu / +4dBm is the operating level. Any circuitry you use should have a further 20dB of headroom.
This means you must buy a professional interface of some sort, or make one.
The suggestion by Usekgb of the DRV143 is a good one. You'll need +&- 18v supply rails at least. No non-prof sound card will be able to reach these levels.
You should be able to "****" the feedback of the 143 to get the gain you need. It may not keep all elements of it's exemplary spec, but will be well useable.
This means you must buy a professional interface of some sort, or make one.
The suggestion by Usekgb of the DRV143 is a good one. You'll need +&- 18v supply rails at least. No non-prof sound card will be able to reach these levels.
You should be able to "****" the feedback of the 143 to get the gain you need. It may not keep all elements of it's exemplary spec, but will be well useable.
You could even put an op-amp before the DRV134 to get a little bit of gain. Also, when you balance a signal, you are actually sending two signals, thus doubling the voltage at the receiving end.
Also, for the most part, Pin 2 will be hot. That is the industry standard. There are still a few pro sound companie that use pin 1 as hot (what a pain!), but pin 2 hot is the standrd.
Cheers,
Zach
Also, for the most part, Pin 2 will be hot. That is the industry standard. There are still a few pro sound companie that use pin 1 as hot (what a pain!), but pin 2 hot is the standrd.
Cheers,
Zach
The DRV134 will give you better performance than the 5532 layout due to the fact that all of the resistors required to set the gain of the op-amps are internal and laser trimmed in the DRV134. So, in reality, using the DRV134 will be cheaper, use less parts, and will give better performance.
Cheers,
Zach
Cheers,
Zach
Hi,
Yes, but this isn't here on first place of priority. Daniel needs moderate quality preamp with 20dB gain; the DRV134 hasn't gain.(I use AD SSM 2142 for high quality applications).
Regards
usekgb said:
Yes, but this isn't here on first place of priority. Daniel needs moderate quality preamp with 20dB gain; the DRV134 hasn't gain.(I use AD SSM 2142 for high quality applications).
Regards
Actually, you can get gain out of a DRV134 by inserting resistors in pins 2 & 7, but as I intimated earlier, it will start to degradr the performance.
Moamps solution is elegant.
I believe you need "golden ears" to tell the DRV134 and SSM2142 apart. To me they're functionally equivalent.
Moamps solution is elegant.
I believe you need "golden ears" to tell the DRV134 and SSM2142 apart. To me they're functionally equivalent.
Moamps,
Have you considered arranging the opamps in parallel rather than in series in order to achieve a more accurately balanced output?
In your diagram you would disconnect R5 from the o/p if IC1A and connect it to pin 3 of IC1A, then remove R1 completely.
Have you considered arranging the opamps in parallel rather than in series in order to achieve a more accurately balanced output?
In your diagram you would disconnect R5 from the o/p if IC1A and connect it to pin 3 of IC1A, then remove R1 completely.
Hi,traderbam said:
this is another possibility, but you must change resistors values to get the same gain in two topologies (noninverting and inverting opamps). Those values are then outside the E24 range, etc..
regards
Hi all,
I was looking for something like Moamps' circuit to up the sub out level of my av receiver into a behringer ultracurve pro. (then onto pro amps)
I have opa 2134's lying about here, and a power supply already built. Can I use these instead of the 5532 ? - I read elsewhere on the forum that the 5532 will handle a higher voltage.
Cheers
Rob
I was looking for something like Moamps' circuit to up the sub out level of my av receiver into a behringer ultracurve pro. (then onto pro amps)
I have opa 2134's lying about here, and a power supply already built. Can I use these instead of the 5532 ? - I read elsewhere on the forum that the 5532 will handle a higher voltage.
Cheers
Rob
Rob,
The 2134 is a different animal. But practically any opamp will work. It depends on how good you want it to be. If you want the best, then go for the dedicated chip DRV134.
Oh, the datasheet say the 2143'll take + - 18v.
The 2134 is a different animal. But practically any opamp will work. It depends on how good you want it to be. If you want the best, then go for the dedicated chip DRV134.
Oh, the datasheet say the 2143'll take + - 18v.
Hi John,
Would the DRV134 drop straight into the above circuit or do I need a new one? - You know that electronics ain't my forte😉 😱
Cheers
rob
Would the DRV134 drop straight into the above circuit or do I need a new one? - You know that electronics ain't my forte😉 😱
Cheers
rob
😀 Cheers John but...,
I've added a couple of them to an order I've just placed. How different would a 'proper' circuit be in complexity ? I've got a few transformers lying around and am looking for a UK supplier of the DRV134 right now. Can probably adapt the power supply I've got at the mo : http://sound.westhost.com/project05.htm
I'll do a search for the DRV cicuits and see what I find.
EDIT: found this : http://www.jensen-transformers.com/as/as022.pdf
Has an option without transformers...(not drv134 though)
Cheers
Rob
I've added a couple of them to an order I've just placed. How different would a 'proper' circuit be in complexity ? I've got a few transformers lying around and am looking for a UK supplier of the DRV134 right now. Can probably adapt the power supply I've got at the mo : http://sound.westhost.com/project05.htm
I'll do a search for the DRV cicuits and see what I find.
EDIT: found this : http://www.jensen-transformers.com/as/as022.pdf
Has an option without transformers...(not drv134 though)
Cheers
Rob
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