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THAT Driver :: A minimalistic differential driver / preamp with 0.000021 % THD

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mboxler

Member
Joined 2011
Thanks Tom

Don't know what was going through my head regarding any noise on the THAT Receiver inputs. Sorry you had to explain the obvious. I seem to learn so much more building things rather that getting them assembled.

Got the board today. Looks like the THAT 1646 chips are back ordered at Mouser :(

Mike
 
M

mboxler

Member
Joined 2011
I finally got the board populated. I had my own +- 15 volt power supply, so didn't populate any of the components on the last page of the instruction document. If anyone else goes this route, I found it much easier to install the terminal block to j5, solder jumpers to d9 and d11, and connect the PS outputs to the j5 terminal block.

My testing didn't go as planned, but perhaps I have misunderstood the 6 db gain of the THAT Driver. I applied a .25 volt sine wave to j1, and expected a .5 volts across pins 1 and 2, and .5 volts across pins 1 and 3 of j2. Instead, I measured .25 volts. I did measure .5 volts across pins 2 and 3 of j2.

Does the 6 db gain refer to the voltage across pins 2 and 3, which are the inverted .25 volt sine waves?

Thanks, Mike
 
P

postpunk

Member
Joined 2004
I have finished my build of the THAT driver. I use it between my preamp and mod86. There seems to be a good deal of synergy between the Neurchrome devices. The sound I am experiencing is very clearly greatly improved. I am highly satisfied and would recommend the THAT driver to everyone who are using Mod86 and are currently using it Single ended.

Thanks Tom!
 
P

postpunk

Member
Joined 2004
BrianL said:
I would attribute the "good deal of synergy" to minimal distortion and noise end-to-end. To borrow a hackneyed audio reviewer phrase -- "veils removed"
Click to expand...

Thanks for your comment, I am sure you are right.
I can't stress enough how much of a difference adding the THAT Driver to my system has made. Amazing, I really mean it. Everything is better. Imaging, punch whatever.
 
tomchr

tomchr

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Joined 2009
neurochrome.com
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BigE said:
Will you be making another batch?
Click to expand...

No. The THAT Driver used the LME49710, which has been discontinued by TI for over two years now. It was never a big seller anyway.

I may offer a universal buffer at some point. Maybe in the late spring or over the summer. The idea would be to have a high-end buffer that could replace both the THAT Driver and the THAT Receiver. It would be a fully assembled circuit module; no bare board option. It'd be a stereo board featuring better performance (lower noise) than the THAT boards.

How much would you be willing to pay for such a module? $99? $149? $199?

Whether I'll offer such a module for sale depends a lot on whether I can make the finances work.

Tom
 
tomchr

tomchr

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Joined 2009
neurochrome.com
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For a fully assembled module, $149 doesn't leave much for me and $99 even less if any at all. I could probably do an SMD-prepopulated option for $99. You'd then have to add connectors and a few other leaded parts.

It all depends on the complexity of the circuit. Can I expect you to provide your own ±15 or ±18 V supply? Or will the universal buffer need to have on-board regulators?

Tom
 
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