Re: Focusrite Saffire Pro 40 re-cap



Yes I'm here unfortunately. It was the broken E-Mu 1820M which brought me here in the first place. It's still working but the drivers doesn't support Windows 10 anymore, but there are some hacks which keep her going (so far, next update may break them). Anyway, I'm going to recycle the A/D PCB from the 1820M to build an 8 ch ADAT converter, there are three great AKM (rip the burn factory) A/D converter chips on it, AK5394A with a 123 dB SNR (on paper anyway), and then I'll use Nihtila's ([url]https://www.tindie.com/products/nihtila/adc-ak5572-high-performance-audio-ad-converter/[/url])...

Re: Focusrite Saffire Pro 40 re-cap

Got a second hand Pro 40, thought it could be used at least as ADAT A/D now as officially it's not supported/working with Windows 10 anymore. Anyway, it does, at least on my 20.04, and I have it connected to 1820M's FW port, the 1820M sits on PCI bus converter which connected to PCIe slot (there are no PCI slots on the motherboard).

Now the PSU is some generic one made by FEREX, model name is FP07M063. That same one is used on many (all?) Focusrite interfaces, though afaik they are planning to replace it. It's specs look like this:...

Re: EMU 1820M not working properly

The measured ohms are in circuit without power, the device is biased by the DMM and resistors around. Using another DMM you might get different readings.

Anyway, I used TP0610K and was able to fix all but one channel (it still measures the lower ohmage). I also noticed a similar problem in one input channel (didn't fix that yet).

Re: EMU 1820M not working properly



Check the output section. I had similar problem (1820M) with the SMD MOSFET's used as switches, they were marked "6K". Measured (without power) the Rds and in lower output level channels that was way below (something like 18k vs. 54k) causing voltage drop....