LDR PRE

Stereo LDR Pre MkII kit

Includes:

Main PCB
Upgraded Nano Clone with Atmega328PB and latest firmware
Linear power supply PCB.

Features: 4 stereo inputs and 2 outputs, LDR volume control. Can be remotely operated by Apple compatible remote or rotary encoder with push button. Runs on 7.5-9V (I>300mA) switching power supply adapter (not included) or linear power supply (PCB included). For BOM see link below.

See forum link for more details:

LDR Pre MkII

Fully Completed LDR Pre MkII SE Kit

Includes:

Fully built and tested main controller PCB with latest firmware
2.42" graphical OLED
IR sensor
Rotary encoder
Interconnecting cables and connectors
Packaging and postage

All you need to add is 7.5V power source, remote, RCA connectors and enclosure of your choice. A cheap 7.5V 500ma power supply from Amazon or Aliexpress is enough, like this one for example:

https://www.aliexpress.com/item/32857105606.html

as all regulators and filtering is included in the board. If you still prefer linear power supply, I can provide that as well. Sonically, there is no difference between two types whatsoever. Bare in mind that linear power supply runs on 220V only. If you need 110V version, you need to install a different power transformer.

You can find cheap compatible remote here: https://www.aliexpress.com/item/1005002033357156.html

or buy original A1294 Apple remote:

https://www.amazon.de/-/en/MM4T2ZM-A-Apple-remote-control/dp/B01FG0ZVEI/

LDR Pre MkII BOM with Mouser and Digikey ref

LDR Pre MkII User Manual

Questions? Send an email to dacgear@gmail.com

LDR Pre MkII BOM and firmware:

goo.gl/frBoKs

Google Sites

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