Tortuga Audio LDR3x DIY Preamp Controller w/ Remote - Page 3 - diyAudio
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View Poll Results: What type remote do you prefer to control your preamp?
Use a dedicated custom remote? 2 10.53%
Use the Apple Remote? 5 26.32%
Use an app on my iPhone, iPad or Android? 9 47.37%
Custom plus apps? 2 10.53%
Apple plus apps? 1 5.26%
Voters: 19. You may not vote on this poll

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Old 25th July 2013, 12:48 PM   #21
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Default Now includes IR Remote & reduced price for Slave Board

We've made some changes!

1) Our LDR DIY Preamp Controller Master Board now also includes our custom IR remote. All you need to supply is your own 12 VDC power supply and you'll have a fully functional state-of-the-art LDR attenuator/preamp controller - $295

2) If you're looking to build a balanced preamp, we've reduced the price of our optional Master Board - $150

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Old 25th July 2013, 01:47 PM   #22
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We've made some changes!

1) Our LDR DIY Preamp Controller Master Board now also includes our custom IR remote. All you need to supply is your own 12 VDC power supply and you'll have a fully functional state-of-the-art LDR attenuator/preamp controller

2) If you're looking to build a balanced preamp, we've reduced the price of our optional Master Board by $50

Click the image to open in full size.Click the image to open in full size.

The LDR3x - What Is It?
  • Digitally controlled, analog audio preamp controller in the form of a populated 2.5 inches wide by 4.7 inches long printed circuit board
  • Comes with a handheld IR remote
  • Allows the DIY audio enthusiast to build their own exceptionally transparent and articulate balanced or unbalanced audio preamplifer
  • Rivals the performance of even the best high end preamp costing 10-100 times more than the LDR3x
  • By itself is an unrivaled passive preamp/controller but can also be incorporated into any DIY active preamp design
  • Utilizes light dependent resistors (“LDR”) in lieu of conventional potentiometers or stepped resistive attenuators for volume control
  • Precision control of the LDRs and all other functionality of the LDR3x is done via a software driven on-board microcontroller (microprocessor)
What's Included?
  • Tortuga Audio 2.5 by 4.7 inch printed circuit Master Board populated with components
  • Vishay TSOP1138 38kHz high performance IR Receiver which can be inserted/soldered into the board or located external to the board
  • Tortuga Audio IR remote with full functionality
  • Optional - matching Tortuga Audio Slave Board to enable balanced inputs - $150 additional (must be purchased with matching Master Board)
Functionality
  • Smooth custom attenuation curve from -60 to 0 dB
  • Accepts one (1) single ended unbalanced stereo input
  • Accepts one (1) balanced stereo input when mated with the LDR3x Slave Board
  • Can switch between 3 inputs (unbalanced or balanced) when mated with an appropriate external relay/input board
  • Fully controllable via infrared remote
  • Fully controllable via an encoder with integral switch
  • Alternatively controllable via discrete user inputs including a conventional volume control pot
  • Output muting with smooth ramp down and ramp up
  • Status output than can drive a status LED
  • Provides traditional left/right channel balance for fine tuning
  • By itself, is an LDR based passive preamp/controller
  • Mated with a buffer output stage, can be an active LDR preamp/controller
  • Electrical and optical isolation between audio and power/control signals
  • Provides a 12 VDC trigger out to turn other audio system components on/off
  • Runs off of any 5 VDC or 12 VDC power supply (12 VDC trigger out feature requires 12 VDC supply)
How Much Does One Cost?
  • Master Board including IR Remote - $295
  • Optional Slave Board for balanced inputs - $150
How Do I Buy One?
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Old 5th August 2013, 01:04 PM   #23
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We're running a whopping 33% off summer sale on our DIY LDR preamp controller board.
  • Master Board w/ remote - normally $295 - sale price $195!!!
  • Master & Slave Boards w/ remote (for balanced signals) - normally $445 - sale price $295!!!
We accept all major credit cards plus PayPal.

PM me or email me at morten@tortugaaudio.com with any questions. Or just post you questions and comments here.

Here's the link to our website/store for more info: LDR3x DIY Preamp Controller Board | Tortuga Audio
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Old 5th August 2013, 02:14 PM   #24
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Is it possible to use these after a multichannel dac in a biamping setup with computer based crossovers?

Is it possible to use one after a 2 channel dac, before an outboard active crossover in a 2 or 3 way bi/tri amp set up?
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Old 5th August 2013, 07:58 PM   #25
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Originally Posted by kuribo View Post
Is it possible to use these after a multichannel dac in a biamping setup with computer based crossovers?

Is it possible to use one after a 2 channel dac, before an outboard active crossover in a 2 or 3 way bi/tri amp set up?
This simple answer is a qualified yes.

It's helpful to use pics to talk about this so I've attached the diagram below.

The first configuration is your basic 2 channel DAC-preamp-amp with passive crossovers in the speakers.

The second shows the same 2 channel DAC-preamp but with an external active crossover feeding a tri-amp but could also be a bi-amp. This was the configuration of my personal rig for quite some time where I used our LDR6 Passive Preamp (same technology as the LDR3x). I've since gone to using full range speakers.

In both the first two configurations a single LDR3x preamp board handles the job just fine.

The third shows a bi-amped 4-channel DAC configuration where the crossover is done digitally upstream or integral with the DAC. Here we use an LDR3x in a master/slave configuration where the master handles the 2 left channels and the slave handles the 2 right channels. Please note that these are all unbalanced signals.

Where it gets even more interesting is in the last configuration which is a tri-amped 6 channel DAC again with the crossover done in the digital domain. Here we need 6 channels so a single LDR3x master/slave isn't enough. We could go with 2 pairs of LDR3x master/slave boards. How does this work with 2 masters? Actually this works quite well. We sold a pair of our LDR6 Passive Preamps to one customer who wanted mono-preamps. Using a single remote, the volume of both mono-preamps followed in lock-step even though they weren't actively slaved to each other. In the event they ever got out of synch (not at the same volume level) it's a simple matter of driving volume to zero via the remote to re-sync them.

I'm sure there are other possible variations on these scenarios but in most cases I can think of the LDR3x should be able to work quite well.

Cheers,
Morten

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Old 5th August 2013, 08:16 PM   #26
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Thank you for your detailed reply.

I should have mentioned that I am interested in balanced inputs and outputs. How would this change things?

Thanks again.
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Old 5th August 2013, 10:40 PM   #27
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Quote:
Originally Posted by kuribo View Post
Thank you for your detailed reply.

I should have mentioned that I am interested in balanced inputs and outputs. How would this change things?

Thanks again.
Handling balanced I/O basically means that for each nominal signal you actually have two signals, a so called + and a - which are 180 degrees out of phase with other.

In terms of the diagram in the previous post, you would basically need twice the number of LDR3x boards since you'd have twice the signals. This gets back to the dual board LDR3x Master/Slave scenario which was designed for handling balanced inputs/outputs where the Master handles say the left channel +/- pair and the Slave board handles the right channel +/- pair. But with multiple channels the hardware count adds up.

And while it gets messier with multiple boards, we can easily match the attenuation curves off all the boards needed using our established LDR testing and curve correction protocols.

Alternatively, you could use transformers to briefly convert the signals to unbalanced at the input to the preamp and back to balanced at the output of the preamp. This would save you all the extra boards and prove to be a less costly approach. Edcor makes some nice transformers for this that run about $25 for a pair. You'd need 3 pairs for the tri-amped case in lieu of the extra LDR3x boards. I'm generally not in favor of all extra signal manipulation with transformers but they are quite quiet and introduce minimal signal loss.

Best,
Morten
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Old 8th August 2013, 01:45 PM   #28
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We were just informed by one of our customers that if you're using Microsoft's Internet Explorer during purchase/checkout on our website/store that you might encounter a security warning page with the message..""This website's address doesn't match the address in the security certificate"

This is unique to IE and doesn't happen with either Chrome or Firefox. It's just our friends at Microsoft being more special again.

We have our hosting service looking into this but meanwhile be assured that our website is indeed secure and that we have all appropriate security certificates are in place. You can confidently bypass this warning message and purchase through our web store. LDR3x DIY Preamp Controller Board | Tortuga Audio

If you encounter this problem or have any related concerns or problems with our website please don't hesitate to PM me or contact me directly at morten@tortugaaudio.com

Enjoy!
Morten
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Old 10th August 2013, 07:52 PM   #29
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Quote:
Originally Posted by CaptainWatt View Post
We were just informed by one of our customers that if you're using Microsoft's Internet Explorer during purchase/checkout on our website/store that you might encounter a security warning page with the message..""This website's address doesn't match the address in the security certificate"

This is unique to IE and doesn't happen with either Chrome or Firefox. It's just our friends at Microsoft being more special again.

We have our hosting service looking into this but meanwhile be assured that our website is indeed secure and that we have all appropriate security certificates are in place. You can confidently bypass this warning message and purchase through our web store. LDR3x DIY Preamp Controller Board | Tortuga Audio

If you encounter this problem or have any related concerns or problems with our website please don't hesitate to PM me or contact me directly at morten@tortugaaudio.com

Enjoy!
Morten
Just a quick note to let everyone know we've resolved the above problem with Microsoft Internet Explorer. Turns out we didn't have a fixed IP address even though we ordered one and have been paying for one. We have one now! Trust yet verify indeed.
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Old 13th August 2013, 11:48 AM   #30
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Default Thank you!

A quick shout out to our new friends in Portugal, Singapore and New Zealand!

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