Pro Audio Design Forum

The Susumu RR series seem to be readily available but the "audio" version RRS is pretty much unobtainium. That was my experience too. I'll see if I can find Dave's original research on the resistors "not as good" and then ask for his permission to use the data. EDIT: I found the...

Are those still available? With 20 modern LEDs at 1 mA/each you should be able to light the room at FS. I think on one of the LM3914 GR-10 builds we had a series resistor in series with the entire parallel LED array. The problem was dropping the brightness beyond the LM3914's minimum current so Roge...

Im also still not decided on if i should integrate this with a analog sum box im designing. Im leaning toward keeping this a separate unit all together. Well, with all the insert points it has you'll probably run out of back panel before you have room to put anything else in the box. :D On those LE...

sr1200. I found the original document link on the web server: http://www.ka-electronics.com/PicoComp/PCB-Kits/Documents/PSU/PSU_Documents.htm The values you show are about right based on the BOM there. C3 is meant to be a film or mono ceramic around 100 nF. Here's a ripple estimator: http://www.proa...

Correct. I need to see if I can find the brands that "weren't as good."

We went from 0603 to 0805 resistors for the lower values. In larger values there's unlikely to be a difference but in the low values where the signal current was a significant percentage of the power dissipation the tempco caused modulation. I agree with John that with caps bigger isn't necessarily ...

Here's the Susumu link:

http://www.susumu.co.jp/english/pdf/products-j01-04.pdf

Availability of these resistors with "comfort sound" through distribution was an issue:

http://www.susumu.co.jp/english/pdf/products-j01-05.pdf

I seem to recall reading something that the physically larger components are better behaved. Like given two resistors of the same value and composition, the larger of the two would be better behaved. We up-sized resistors by one size on a later spin of the board and changed vendors to reduce the se...

Thanks for joining us! There are some pretty significant differences in SMT resistors which, due to signal-induced self-heating, have better or worse THD-3. On a recent demo board THAT used Susumu because they tested better. Those are available from Digi-Key. Dave Hill of Crane Song shared some of h...

The only one I remember having a mechanical VU was the MasterRoom B-series for broadcast. The model number doesn't seem to fit. I'd be intersted in seeing a picture. If there is a problem with the driver or electronics the parts will be numbered. IIRC the driver transistors were Motorola TO-66 devic...