Pro Audio Design Forum

We don't have a disagreement, and I do not advise using 2x the supply voltage you actually need. I make a battery powered product and i use a class D chip to drive a speaker very efficiently, with good battery life. IIRC I was suggesting a split supply with ground in the center. This is your design ...

I feel like I am repeating myself, maybe we don't need so many threads for one project. If you use a single supply with v/2 instead of split supply with real ground, that V/2 needs to be "ground like". It would take too many worlds to completely describe what ground is "like" but...

Of course my STC 4038 example is a red herring cos it doesn't need P48V. It's then straightforward to get well under 1nV/rtHz short circuit noise with a dedicated ribbon mike amp. using Cohen without any P48V and protection. But the 4038 ribbon is a passive nominal 200R source. The important noise ...

At 0.8nV/rtHz pretty quiet part... Not as low input C as the 489 but a few pF is not that big of a deal. Might make an interesting mic preamps... if they weren't already decent. The problem isn't getting below 1nV/rtHz on a mike preamp but doing it with full P48V and protection. I am not very sure ...

OK, first trial under fire was disappointing,, food undercooked. :( I just spent a couple hours ASSuming my crude temp calibration was off, but in fact I was pretty damn close ... I can boil off a drop of water on the aluminum heat spreader at the top setting. Just to make it easier to control I off...

The TI version is unclear, but if you follow the thrust if the incomplete text they say the input impedance should equal R1 in parallel with R2. What they mean is the + input termination should equal R1 in parallel with R2 to cancel input bias current effects. It is poorly executed and incomplete as...

Well, I'm not feeling lucky or anything, but I do remember Shure used a very similar method on their famous FP33 mixer, and nobody seemed to ever complaint about it. I only know that because I had the chance to see the schematics. I'm not sure about the FP32, that preceded it, because I also had th...

I't alive cooky.JPG The wiring may look a little dodgy but it should be safe. :o :o I use a 3 wire line cord with the aluminum plate grounded to the wall, all plugged into a GFCI outlet. the two pairs of wires running from the processor board are the two power transistors in upper left hand corner t...

What happens if the switch is grounded when not connecting? Like on the design? That will keep the switch clean... :lol: If you do it right it could be silent when switched off, but if you do one of several things wrong, it can leak into the primary path. Do you feel lucky or smarter than THAT supp...

While this may involve too much design work and impractical for multiple units, but I have seen LED based night lights that use some clear plastic (plexiglas) as a light spreader to take concentrated white LED light and re-radiate it as a diffuse light source. Do any 3-d printers support clear media...