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Author Topic: New TS-2 Preamp ... under development (part II)  (Read 92497 times)

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Offline fivefishdiy

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Re: New TS-2 Preamp ... under development (part II)
« Reply #45 on: August 14, 2008, 10:14:11 AM »
the Grace Designs V2 pre-amp draws 600-700mA at 6VDC.

Thanks Jason! Good info to know. 

** Now I feel better :)


Here's the Hosa model...YXF-247



I like the concept, but I don't like the internal connection of that Hosa. It's shorting pins 1 and 3. That's shorting one leg of the output to GND!

I'd rather see Pin1 connected to the Sleeve, pins 2 connected as shown and just leave pin 3 alone and unconnected.




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Offline anechoic

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Re: New TS-2 Preamp ... under development (part II)
« Reply #46 on: August 14, 2008, 12:28:21 PM »
HPF, same....but I would like this feature since ultra low lows have no real value in recording anyway.

hpf is very very useful outdoors probably not so in a controlled situation like a recording studio
when a low freq clips your signal it is very difficult and sometimes impossible to fix this in post
been there done that
'In the new world the characteristic unit will be
small, highly mobile, independent and intelligent.'
                                - Robert Fripp

Offline anechoic

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Re: New TS-2 Preamp ... under development (part II)
« Reply #47 on: August 14, 2008, 12:31:34 PM »
Hosa makes versions of the "special cable" with two XLRF to 1/8-inch TRS.
Check out the Hosa YXF-247 (1 ft.) or YXF-302 (2 ft.) or XYF-305 (5 ft.).
Price is less than $20 from your favorite online audio merchant.

Flintstone

I just bought this:
http://www.audiogear.com/cgi-bin/shopper.cgi?key=Adpt2FXMSM&preadd=action
nicely made and only $13USD
'In the new world the characteristic unit will be
small, highly mobile, independent and intelligent.'
                                - Robert Fripp

Offline PH

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Re: New TS-2 Preamp ... under development (part II)
« Reply #48 on: August 14, 2008, 02:55:52 PM »
HPF, same....but I would like this feature since ultra low lows have no real value in recording anyway.

hpf is very very useful outdoors probably not so in a controlled situation like a recording studio
when a low freq clips your signal it is very difficult and sometimes impossible to fix this in post
been there done that


I've done tons of work in both areas, studio and indoor/outdoors. HPF is very useful in both. I believe I said several times that I would like to have the HPF filter included.
However, it can be done in post with no ill effects.

There is another earlier thread where much of this is discussed. Many of these suggestions have already been suggested a few weeks back.
This is the essentially the finished version, save a few minor revisions before it's finalized for production.

I just can't see any reason to want an unbalanced output on any device, especially when you can make or a buy a cable that will accomplish that desire for less than $20.
A balanced output is MUCH preferred for many reasons.

Keep up the good work Five Fish   +T

Offline Colin Liston

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Re: New TS-2 Preamp ... under development (part II)
« Reply #49 on: August 14, 2008, 03:12:17 PM »

Here, here.  Keep up the good work.
Occasionally....music mics record

Offline anechoic

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Re: New TS-2 Preamp ... under development (part II)
« Reply #50 on: August 14, 2008, 03:48:17 PM »
HPF, same....but I would like this feature since ultra low lows have no real value in recording anyway.

hpf is very very useful outdoors probably not so in a controlled situation like a recording studio
when a low freq clips your signal it is very difficult and sometimes impossible to fix this in post
been there done that


I've done tons of work in both areas, studio and indoor/outdoors. HPF is very useful in both. I believe I said several times that I would like to have the HPF filter included.
However, it can be done in post with no ill effects.

right but that is not always the case with outdoor sound
(I'm not talking about live music taping)
there are times when, sans hpf, the low freqs in a gust of wind or the rumble inside a car will clip the entire signal
and is not something that can be fixed (easily or otherwise) in post
and makes a good case for a hpf

 
 
'In the new world the characteristic unit will be
small, highly mobile, independent and intelligent.'
                                - Robert Fripp

Offline ero3030

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Re: New TS-2 Preamp ... under development (part II)
« Reply #51 on: August 14, 2008, 03:48:44 PM »
w/ nashplil on keeping it clean and easy.  if all works out, like it looks like it is going that way,   this little box will have plenty of mods/features 5-fish will add later.  ed
needin some fishhead music!

" known for f**king up a good weekend on a Thursday nite "

Offline PH

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Re: New TS-2 Preamp ... under development (part II)
« Reply #52 on: August 14, 2008, 04:13:25 PM »
HPF, same....but I would like this feature since ultra low lows have no real value in recording anyway.

hpf is very very useful outdoors probably not so in a controlled situation like a recording studio
when a low freq clips your signal it is very difficult and sometimes impossible to fix this in post
been there done that


I've done tons of work in both areas, studio and indoor/outdoors. HPF is very useful in both. I believe I said several times that I would like to have the HPF filter included.
However, it can be done in post with no ill effects.

right but that is not always the case with outdoor sound
(I'm not talking about live music taping)
there are times when, sans hpf, the low freqs in a gust of wind or the rumble inside a car will clip the entire signal
and is not something that can be fixed (easily or otherwise) in post
and makes a good case for a hpf

 
 


I think you must be arguing with yourself, since no one is disagreeing with you.
HPF is a great option, I believe I said that about 5 times already.
  -T


Offline anechoic

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Re: New TS-2 Preamp ... under development (part II)
« Reply #53 on: August 14, 2008, 04:40:59 PM »
HPF, same....but I would like this feature since ultra low lows have no real value in recording anyway.

hpf is very very useful outdoors probably not so in a controlled situation like a recording studio
when a low freq clips your signal it is very difficult and sometimes impossible to fix this in post
been there done that


I've done tons of work in both areas, studio and indoor/outdoors. HPF is very useful in both. I believe I said several times that I would like to have the HPF filter included.
However, it can be done in post with no ill effects.

right but that is not always the case with outdoor sound
(I'm not talking about live music taping)
there are times when, sans hpf, the low freqs in a gust of wind or the rumble inside a car will clip the entire signal
and is not something that can be fixed (easily or otherwise) in post
and makes a good case for a hpf

 
 


I think you must be arguing with yourself, since no one is disagreeing with you.
HPF is a great option, I believe I said that about 5 times already.
  -T



no I'm disagreeing with your 'However,...' part where you claim the artifacts created by not having a hpf can be fixed in post
capishe?
« Last Edit: August 14, 2008, 04:42:30 PM by anechoic »
'In the new world the characteristic unit will be
small, highly mobile, independent and intelligent.'
                                - Robert Fripp

Offline anechoic

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Re: New TS-2 Preamp ... under development (part II)
« Reply #54 on: August 14, 2008, 05:14:58 PM »
HPF, same....but I would like this feature since ultra low lows have no real value in recording anyway.

hpf is very very useful outdoors probably not so in a controlled situation like a recording studio
when a low freq clips your signal it is very difficult and sometimes impossible to fix this in post
been there done that


I've done tons of work in both areas, studio and indoor/outdoors. HPF is very useful in both. I believe I said several times that I would like to have the HPF filter included.
However, it can be done in post with no ill effects.

right but that is not always the case with outdoor sound
(I'm not talking about live music taping)
there are times when, sans hpf, the low freqs in a gust of wind or the rumble inside a car will clip the entire signal
and is not something that can be fixed (easily or otherwise) in post
and makes a good case for a hpf

 
 


I think you must be arguing with yourself, since no one is disagreeing with you.
HPF is a great option, I believe I said that about 5 times already.
  -T



no I'm disagreeing with your 'However,...' part where you claim the artifacts created by not having a hpf can be fixed in post
capishe?

Some folks would rather argue with themselves than actually take the time to read the thread, and maybe even learn something.
It's easier to argue a silly point of symantics, especially when you can't spell either.
capiche?

haha! touché
http://www.urbandictionary.com/define.php?term=capishe
btw, 'symantics' is actually spelled 'SEMANTICS'
but hey you're from Nashville so I understand! ;)
« Last Edit: August 14, 2008, 05:19:15 PM by anechoic »
'In the new world the characteristic unit will be
small, highly mobile, independent and intelligent.'
                                - Robert Fripp

Offline digifish_music

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Re: New TS-2 Preamp ... under development (part II)
« Reply #55 on: August 14, 2008, 06:57:17 PM »
Hosa makes versions of the "special cable" with two XLRF to 1/8-inch TRS.
Check out the Hosa YXF-247 (1 ft.) or YXF-302 (2 ft.) or XYF-305 (5 ft.).
Price is less than $20 from your favorite online audio merchant.

Flintstone

I just bought this:
http://www.audiogear.com/cgi-bin/shopper.cgi?key=Adpt2FXMSM&preadd=action
nicely made and only $13USD

Do you know the wiring?

digifish
- What's this knob do?

Offline digifish_music

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Re: New TS-2 Preamp ... under development (part II)
« Reply #56 on: August 14, 2008, 07:04:38 PM »

Here's the Hosa model...YXF-247



I like the concept, but I don't like the internal connection of that Hosa. It's shorting pins 1 and 3. That's shorting one leg of the output to GND!

I'd rather see Pin1 connected to the Sleeve, pins 2 connected as shown and just leave pin 3 alone and unconnected.


I agree, it's easy to open up the XLRs and snip the wire bridge they have soldered in.

The problem for manufacturers (such as yourself) is that you can't control how users will treat your pre, and while you don't like it, your preamp will survive this cable. BTW: It's hardly the users fault if he buys a cable from the shop apparently designed for the task and plugs it in. Sound Devices (OTOH) manual clearly warns against this wiring configuration, I checked with tech support when I bought it and they said it could damage the outputs. I am not sure how conservative they were being, but good design should cope with these two basics (IMO):

1) all the outputs being shorted together (or in any combination)
2) P48V sent into the outputs.

You score +T on those two :)

digifish 
- What's this knob do?

Offline anechoic

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Re: New TS-2 Preamp ... under development (part II)
« Reply #57 on: August 14, 2008, 07:05:08 PM »
Hosa makes versions of the "special cable" with two XLRF to 1/8-inch TRS.
Check out the Hosa YXF-247 (1 ft.) or YXF-302 (2 ft.) or XYF-305 (5 ft.).
Price is less than $20 from your favorite online audio merchant.

Flintstone

I just bought this:
http://www.audiogear.com/cgi-bin/shopper.cgi?key=Adpt2FXMSM&preadd=action
nicely made and only $13USD

Do you know the wiring?

digifish

yeah, I tested the cable with a DMM and pins 1&3 are shorted
so I opened both XLR's and just snipped the connections

'In the new world the characteristic unit will be
small, highly mobile, independent and intelligent.'
                                - Robert Fripp

Offline fivefishdiy

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Re: New TS-2 Preamp ... under development (part II)
« Reply #58 on: August 15, 2008, 05:10:55 PM »
1) all the outputs being shorted together (or in any combination)

I want to have an official answer for this, so I emailed the engineers who designed the chips I use to get the information straight from them... (and not just rely on my own interpretation of the datasheet).

My preamp "will respond to a shorted output from single-ended loads or cables just fine due to the current-sensing nature of OutSmarts (the technology used in my balanced line driver). Excessive load current does not flow from the shorted output into ground. The opposing output, when connected single-ended, produces an automatic 6 dB gain increase to maintain overall system level."

So there you go!  All is good! :)
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Offline fivefishdiy

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Re: New TS-2 Preamp ... under development (part II)
« Reply #59 on: August 15, 2008, 10:28:40 PM »
VU Meter PCBs arrived last 2 days ago. Perfect fit between the motherboard and switchboard.... 1" high.



Built one prototype tonight. Here's to give you an idea of it's size.



Ohh yeah, it works... no problem.




NEXT STEP:
Build a prototype of the High Pass filter on a breadboard.



« Last Edit: August 15, 2008, 10:30:22 PM by fivefishdiy »
SC-1 Mic Preamp Kits... www.fivefishstudios.com
Photo Rig: Canon EOS30D, 70-200 f4L, 24-105 f4L, 50mmf1.8, 10-22mm Wide angle, Sigma 200mm Macro, Harddisk CF card reader/backup
Video: Sony HDV HDR-HC5

 

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