Pro Audio Design Forum

Hi, It's better to maximize the copper area under the chip to spread the heat better, therefore having the pad on the top and the bottom of the PCB joined by vias is a good start. My design has 4 vias to stitch the pads, not 5, the number doesn't matter that much at the end of the day. =) I have 4 ...

I figured it out. Apparently in Eagle, it's tricky to include the thermal pad and vias in the component package itself. So I made a new 1570 component without them and simply added them to the board layout after the fact. I put reference guides as to where to place the thermal pad and vias in layer ...

Thanks guys! Exactly what I needed. My design has 4 vias to stitch the pads. [s]Actually, I'm having a little trouble getting the device's thermal pad to "stitch" to the vias and the bottom layer thermal pad on my layout. I'm working in Eagle, and it seems there are several ways to do this...

Hi Wayne, A quick question about the 1570 and pcb layout. I'm a little confused about the thermal pads. It's not quite clear to me if I need a full pad on the top layer of the pcb (same shape as the bottom of the chip) connected by 5 vias to another thermal pad on the bottom layer; or if the top lay...

So I put a 5V zener on the output of the +5V analog supply regulator, and put the unit back into service at the studio. I then went and did the same thing on my test rig on the bench. The prototype at the studio still shows little transients now and then, but the production model on my bench seems p...

I'm out of the country mixing and will be away from my bench for a week. I'll do a bunch more testing when I return, and report back. Thanks for all of your help guys!

IIRC the - bias supply going slightly positive should not be a problem. You could slow it down, also. Just RC filter the output? I am more concerned about -1V on the +5V supply. I wonder if this is coming from a half wave rectified unregulated supply that randomly comes up negative first then posit...

Scope is connected to the same ground as the 5V reg. Here are some screen captures of the DC coupled scope with a 4.3V zener I had on hand. Obviously that zener is conducting all the time on a 5V supply. Maybe try a 5.1V zener or TVS diode?: +5V supply at power-up, derived from +18V supply: http://w...

Bought a Rigol 1052E scope, which is pretty good considering it's low cost. What I've found is that I have two issues: 1 - My 7.5V switching supply is throwing about 22mV of crap into my otherwise clean linear supply. With the switcher shut down, the +/-18V linear supply exhibits about 2.5mV of ripp...

mediatechnology wrote:I think I suggested the same thing back in posts 4 and 6.

You did indeed. But, with my lack of EE background, I didn't get it. Now that it's been explained to me twice, I'm starting to understand Sorry Wayne!