DIY Preamp Components

DIY Preamp Components

Tortuga Audio is pleased to offer the following preamp components for the DIY audio enthusiast. These components make it possible to build your own audiophile grade high performance passive preamp.

More detailed information on each component is available by clicking on its title or More Details button.

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LDR V25 Preamp Controller

The LDR V25 preamp controller (the “V25”) is a software driven audio volume control and input switching device for high performance passive and active audio preamps. Like its predecessors (the V1, V2 and V2.1 preamp controller) the V25 utilizes light dependent resistors (LDRs) to attenuate volume. Tortuga Audio’s LDR based volume control is now in its 4th generation and delivers a level of sound quality that once you experience it you won’t want to go back to conventional potentiometers, stepped attenuators or even transformer based volume controls. By itself, the V25 preamp controller board allows the audio hobbyist, professional designer or OEM to build an exceptional passive audio preamp that rivals the performance of some of the best high end preamp equipment available today regardless of price. When mated with a downstream preamp gain stage and buffer, the V25 becomes the heart of a very high performance active preamp.


DM1 Display Module

The Display Module (“DM1”) is a 1.8 inch x 1.8 inch, 2 digit, 7-segment numerical LED display board that can be interfaced with the LDR3x Preamp Controller Board to provide numerical/visual feedback of volume level and status of the LDR3x.


Apple Remote

All Tortuga Audio LDRx preamp products can be controlled remotely via the highly affordable and elegantly simple Apple Remote. As of May 1st, 2014, the Apple Remote has replaced the previously offered Tortuga Audio Remote as our primary remote.


Encoder Module

The encoder module is a rotary encoder with integral push button moun …

Encoder ModuleRead More »


LDR Module

The LDR Module is a replacement part for the Tortuga Audio LDR Passive Preamp Controller board. It applies to all versions of our preamp controller boards starting with version 2 (the V2). LDR Modules can be easily removed and replaced and plug into any of the four primary LDR locations on the preamp controller board plus also for input switching on the V25 board. It’s important to orient the LDR Module properly. The white dot on the LDR Module should be the same side as the white dot on the controller board. Replacing an LDR Module should only be necessary if the LDR preamp controller exhibits a significant permanent shift in channel balance or a channel stops responding to volume changes. If these problems can’t be resolved by running an Auto-Calibration cycle or if the controller board hangs during an Auto-Calibration cycle, then probably at least one LDR Module requires replacement.


USB Port & Cable

This 1 foot cable makes it easy to provide an externally accessible USB connection port to update firmware in a LDR3x Passive Preamp Controller located within an enclosure. One end of the cable provides a type A USB port that can be attached via 2 screws to a panel. The other end has 5 pin female header that connects to the J8 5 pin male header on the LDR3x board. For those with a V2 board that already has a micro-USB port board soldered onto the J8 header, you’ll need to first remove that board from the J8 header. We recommend this be done by carefully cutting up the micro-USB port around the pins using a plier/cutter and then using a solder iron to remove any remaining materials from the J8 pins.  


Cardas RCA Jacks (pair)

Beautiful Cardas GRFA Long RCA jacks.  They are made of non- magnetic …

Cardas RCA Jacks (pair)Read More »

$31.04 $24.83