# Digital I/O for QA402 **URL:** \ **Category:** QA40x\ **Created:** [September 1, 2021, 8:35pm UTC](https://forum.quantasylum.com/t/digital-i-o-for-qa402/465 "2021-09-01T20:35:35Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![blurpy](https://avatars.discourse-cdn.com/v4/letter/b/958977/32.png) [@blurpy](https://forum.quantasylum.com/u/blurpy)\ **Post date:** [September 3, 2021, 1:50pm UTC](https://forum.quantasylum.com/t/digital-i-o-for-qa402/465/2 "2021-09-03T13:50:58Z")
I’m curious of the status of that as well. Matt showed a breakout board in this post a while ago: > [@Sneak Peek: The QA402](https://forum.quantasylum.com/t/sneak-peek-the-qa402/203/79): > > Hi @ChUml, Below is a representative plot of THD. Below is a representative plot of THD+N Compared to what was previously posted you can see a lot of clean-up around discontinuities. This is from smarter switching points for the relays. For loopback, here is THD And for loopback, here is THD+N One issue is that the input and output relays need to be configured differently depending on whether you are wanting to optimize for THD or THD+N. For best THD… But I haven’t seen any news after that. --- _[View the full topic](https://forum.quantasylum.com/t/digital-i-o-for-qa402/465)._