# Buying from AliExpress

**URL:** <https://rpi-rgb-led-matrix.discourse.group/t/buying-from-aliexpress/862>\
**Category:** Uncategorized\
**Created:** [August 27, 2024, 2:52am UTC](https://rpi-rgb-led-matrix.discourse.group/t/buying-from-aliexpress/862 "2024-08-27T02:52:25Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![MaxMatrix](https://avatars.discourse-cdn.com/v4/letter/m/ecae2f/32.png) [@MaxMatrix](https://rpi-rgb-led-matrix.discourse.group/u/MaxMatrix)\
**Post date:** [October 12, 2024, 10:24pm UTC](https://rpi-rgb-led-matrix.discourse.group/t/buying-from-aliexpress/862/5 "2024-10-12T22:24:38Z")

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I just posted documentation on that cheap 2-string passive interface board.

> [@Documentation on 2 string passive adapter for $1.56](https://rpi-rgb-led-matrix.discourse.group/t/documentation-on-2-string-passive-adapter-for-1-56/892/2):
>
> Here’s a snapshot of the connection expected by the rpi-rgb-led-matrix code. The cheap board appears to exactly match the standard for string 1 & 2.

The sage advice from the 7 year old 3 string passive board docs:

**LED panels that have 74HCT245 (as opposed to just 74HC245) in their input stage, can deal properly with the 3.3V logic levels.**

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