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Post by Johnkenn on Jun 19, 2015 20:00:16 GMT -6
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Post by baquin on Jun 19, 2015 21:42:49 GMT -6
Yes, it seems like a sweet idea, maybe it would be great to try it with the colourupter or go crazy with the implode.
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Post by winetree on Jun 19, 2015 22:41:05 GMT -6
I think I'll try one with the fuzz for bass and vocals.
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Post by jimwilliams on Jun 20, 2015 9:49:39 GMT -6
Looks like another THAT 1510 chip mic preamp. Good contender for using the Audio Upgrades PIP modules in place of them.
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Post by ngallio on Jun 20, 2015 10:38:52 GMT -6
DIYRE is certainly moving in the right direction.
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Post by Johnkenn on Jun 20, 2015 11:03:29 GMT -6
Jim - how do you consider yours to be superior? Don't mean that in a adversarial manner - just want to know what the differences might be.
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Post by wiz on Jun 20, 2015 18:59:56 GMT -6
I have a few of Jims first generation PIPs. I compared them directly to the the 1510 In a circuit I built ( i compared a lot of those type of chips at the time). Its much clearer and faster sounding to me.
He has released a 2nd generation PIP which I haven't heard.
I ended up using 2 of Jims PIPs in the dual channel preamp I ended designing and finishing.
cheers
Wiz
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Post by jimwilliams on Jun 20, 2015 20:54:02 GMT -6
Jim - how do you consider yours to be superior? Don't mean that in a adversarial manner - just want to know what the differences might be. I only said they were an alternative, not superior, but they do sound different. They do spec better. The PIP uses the same ADA 4898-2 opamp as I suggested for the Svart ADC box and used by Ross Martin per my request on my old DAC he built. At fifty bucks, the PIP costs less than a decent mic transformer. The low noise spec beats all the chip preamps so they will have less hiss using low output dynamic and ribbon mics. |
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Post by wiz on Jun 20, 2015 21:39:38 GMT -6
Jim - how do you consider yours to be superior? Don't mean that in a adversarial manner - just want to know what the differences might be. I only said they were an alternative, not superior, but they do sound different. They do spec better. The PIP uses the same ADA 4898-2 opamp as I suggested for the Svart ADC box and used by Ross Martin per my request on my old DAC he built. At fifty bucks, the PIP costs less than a decent mic transformer. The low noise spec beats all the chip preamps so they will have less hiss using low output dynamic and ribbon mics. I will say they sound better 8) cheers Wiz |
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Post by BradM on Jun 21, 2015 19:20:49 GMT -6
Yes, it seems like a sweet idea, maybe it would be great to try it with the colourupter or go crazy with the implode. Don't forget you can set the jumper to Bypass on Implode and then basically have the compression disabled while still going through all the discrete circuitry. It would be like an 1176 flavored mic pre! Brad |
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Post by Guitar on Jun 25, 2015 19:35:17 GMT -6
I for one like the THAT 1510 mic pre based on my experience with the SCA T15. I'd like to try some of these. Seems more appealing to me than the regular color modules, which I doubt if I will ever buy.
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Post by gouge on Jul 1, 2015 5:29:27 GMT -6
seems to be a that 1512 chip. wondering what peoples thoughts are?  |
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Post by gouge on Jul 1, 2015 5:49:28 GMT -6
jimwilliams
hi Jim,
I was hoping you might comment on your pip versus the Jensen 16-a input transformer. I notice there is an upgrade schematic on the Jensen website for opamp based pre where it provides 6-9db better noise rejection. wondering how your pip compares?
I'm also not so sure the pip will fit into the CP5
cheers
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Post by ngallio on Jul 1, 2015 6:59:18 GMT -6
Pre-order of the modules has started today.
@ 149 USD it's a very serious contender in the transformrless 500 pre category.
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Post by jimwilliams on Jul 1, 2015 9:15:13 GMT -6
jimwilliams
hi Jim,
I was hoping you might comment on your pip versus the Jensen 16-a input transformer. I notice there is an upgrade schematic on the Jensen website for opamp based pre where it provides 6-9db better noise rejection. wondering how your pip compares?
I'm also not so sure the pip will fit into the CP5
cheers
The JT-16 does provide good CMRR at lower frequencies, but it does fall off quickly at higher frequencies. I do match input transistors on the PIP, an 80 db CMRR is typical. That goes from 20~20k hz. Yes, you could add the JT-16 in front of the PIP, but it will degrade the noise specs a few db's. A well made JT-16 preamp will do -128 db EIN at 150 ohms. The PIP does -129.6 db EIN at 150, -132 at 50 ohms. |
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Post by scumbum on Jul 1, 2015 10:21:55 GMT -6
This is exactly the mic pre I've been looking for !
DIY , 500 series , cheap , Clean ......finally someone delivered .
At $150 that is a great deal .
Question for you guys that have used a THAT 1510 chip mic preamp , Do they sound good on Vocals ?? I've read that its best to have transformers when tracking vocals ?
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Post by tonycamphd on Jul 1, 2015 10:51:39 GMT -6
Peterson Goodwyn is awesome, and he's done a ton for the DIY community, but i'm surprised he went with THAT line amps, i opted out of the that THAT drivers in lieu of the superior AD4898 op amps in my converters, they are the same 8 dip pinout and work beautifully at 16v, so at such a low price point he could have afforded to make these significantly better for around $20 additional... or am i misunderstanding the design?
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Post by gouge on Jul 1, 2015 17:55:50 GMT -6
jimwilliams
hi Jim,
I was hoping you might comment on your pip versus the Jensen 16-a input transformer. I notice there is an upgrade schematic on the Jensen website for opamp based pre where it provides 6-9db better noise rejection. wondering how your pip compares?
I'm also not so sure the pip will fit into the CP5
cheers
The JT-16 does provide good CMRR at lower frequencies, but it does fall off quickly at higher frequencies. I do match input transistors on the PIP, an 80 db CMRR is typical. That goes from 20~20k hz. Yes, you could add the JT-16 in front of the PIP, but it will degrade the noise specs a few db's. A well made JT-16 preamp will do -128 db EIN at 150 ohms. The PIP does -129.6 db EIN at 150, -132 at 50 ohms. I'm keen to give your pip a go in the CP5. once I've got the board in my hand i'll see if the pip can fit. I'm guessing the dip8 near the gain pot is the that chip. if so there are some big caps around it that may mean I need to double socket the pip to gain some height. |
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Post by gouge on Jul 1, 2015 17:56:50 GMT -6
Peterson Goodwyn is awesome, and he's done a ton for the DIY community, but i'm surprised he went with THAT line amps, i opted out of the that THAT drivers in lieu of the superior AD4898 op amps in my converters, they are the same 8 dip pinout and work beautifully at 16v, so at such a low price point he could have afforded to make these significantly better for around $20 additional... or am i misunderstanding the design? I'm guessing it's a case of dip being easier to diy for the beginners. would it not be possible to use a soic on an adaptor instead? |
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Post by tonycamphd on Jul 1, 2015 19:16:17 GMT -6
Peterson Goodwyn is awesome, and he's done a ton for the DIY community, but i'm surprised he went with THAT line amps, i opted out of the that THAT drivers in lieu of the superior AD4898 op amps in my converters, they are the same 8 dip pinout and work beautifully at 16v, so at such a low price point he could have afforded to make these significantly better for around $20 additional... or am i misunderstanding the design? I'm guessing it's a case of dip being easier to diy for the beginners. would it not be possible to use a soic on an adaptor instead? Yeah, i blew that one, i meant to say the lme49720, the AD4898 is soic, it would be better still probably, and would also work with the adapter board, a bit of a pita to solder though. |
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Post by gouge on Jul 1, 2015 21:44:21 GMT -6
tonycamphd I'm not technical when it comes to these things but have some lme chips. do you know if they are pin compatible?
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DaveC
New Member
Posts: 12 
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Post by DaveC on Jul 2, 2015 5:33:19 GMT -6
The THAT 1646 is line driver IC meant to convert the single-ended signal from the 1512 to a balanced output. It is not pin compatible with a LME49720 (or AD4898). The THAT 1646 is pin compatible with the TI134/135 or AD SSM2142 line drivers.
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Post by gouge on Jul 2, 2015 6:41:57 GMT -6
thanks dave.
just had a look at your pre. looks like a step up :-)
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Post by tonycamphd on Jul 2, 2015 8:58:09 GMT -6
The THAT 1646 is line driver IC meant to convert the single-ended signal from the 1512 to a balanced output. It is not pin compatible with a LME49720 (or AD4898). The THAT 1646 is pin compatible with the TI134/135 or AD SSM2142 line drivers. thanx D, welcome to the forum man! i was about to look all that up, you saved me at least 2 days of  haha, I'm getting in over my head here for sure, I know Peterson isn't messing about, the 1512 seems a differential amp... here's some typical apps for these amps, I've read those balancing drivers tend to step on the sound, is this correct to your knowledge?   |
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Post by jimwilliams on Jul 2, 2015 9:15:27 GMT -6
I've found pin compatability to be subject to the layout and parts choices. In D+R consoles, the that parts will oscillate, they are not completely stable.
Funny how this thing isn't out yet but we are all talking about ripping it up and modifing it? I like this place.
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haha, I'm getting in over my head here for sure, I know Peterson isn't messing about, the 1512 seems a differential amp... here's some typical apps for these amps, I've read those balancing drivers tend to step on the sound, is this correct to your knowledge?
