I've been testing a Sabaj A20h and it sounds perfect as far as I can tell. The good price, perfect specs, and quality relay attenuator seem top class.
My idea is to combine a number of these units to make a multichannel attenuator - to be controlled by a 'master unit'. Does anyone have a schematic or experience of this hacking this? On first inspection the amp and attenuator sections are connected together by headers - I imagine that some of these are relay control lines.
I wonder if anyone has had a similar idea before and can help?
My idea is to combine a number of these units to make a multichannel attenuator - to be controlled by a 'master unit'. Does anyone have a schematic or experience of this hacking this? On first inspection the amp and attenuator sections are connected together by headers - I imagine that some of these are relay control lines.
I wonder if anyone has had a similar idea before and can help?
I came across the A20h by chance and immediately had the same idea ... Have you gained any insights in the meantime? I wonder if a simple parallel operation of several A20hs might work in the sense that a single remote control can control all devices without volume deviations ... 🙄
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From what I read its using a digipot of some sort, which in the marketing blurb comes out as "high-precision low-noise 256-level relay to control the volume". Whether its log law or linear isn't clear - in fact I saw conflicting images of the internals of the unit. No relays here, its likely I2C or SPI bus controlled.