Pro Audio Design Forum

I just recevied the print edition of EDN and noticed the front cover article titled "Test 18-Bit ADCs with an Ultrapure Sine-wave Oscillator." Somehow I knew it was written by the late Jim Williams. It was. :( I can almost always recognize Jim's work by its title, the schematic art and the...

Take a quick look at this article: http://www.waynekirkwood.com/Images/pdf/Mic_Splitters.pdf What you're doing is similar to a split. Do re-draw RE6B when you get the chance. Pins 5 and 7 aren't right. Wouldn't you want the pad ahead of the transformer and C5/C6? Or is the point to overdrive the tra...

JR. wrote:Gotcha... that could damage mics and phantom powered external gear expecting the 6.8k

Definitely not good...

JR

Yep. Very loud. A lot like hot-patching the input.

PS: I think i may have found the link that is trashing my cookies...,http://www.ka-electronics.com/images/jpg/Loftec_TS1.jpg or not...is this the old links you were talking about? No, I think the link would be one that looked like this: "http://www.proaudiodesignforum.com/forum/php/posting.php...

I'm not sure what you are saying is wrong.. The phantom voltage at the mic will drop below 48V in normal use (mic current x 6.8k) so 35V could be normal. By real mic I assume you mean a phantom powered mic. Correct. What he's saying though is that the de-selected "active" input re-charges...

I have some 2SK389s I want to use. I moved my vinyl a couple of weeks ago and just got around to pulling out about 20-30 albums I wanted to re-visit. As I mentioned in another thread the turntable got hooked up before the DVD player. The phono preamp in the Kenwood is a 4560 IIRC. :oops: The servo i...

Today we have better opamps available but I'd still put that preamp [P100] up against all comers.

You like that one better than the P10? Probably a better question posed in that thread but I had to ask.

OK, you made me look. I had a hunch I'd find it in the phono preamp post. For the benefit of our readers it's A2. R17 and C9 form the passive input LPF. R14 and C11 form the output LPF. http://johnhroberts.com/P100.gif There's a lot of LF gain in A1 which makes the Vos requirements of A2 far less de...

The LT1012 is only 0.1 V/uS. I do like the idea of the passive LPF ahead of the integrator. My old servo has a passive LPF in series with it's output too I think I used that in a 1512/1570 summing amp similar to the SSM2017 application note. Too bad (affordable) BIFETS lack the DC precision for many...

It's about 3X faster SR (0.8 V/uS vs. 0.3 V/uS) than an OP07 which work fine as servos. (Though the OP07's DC performance could be better which is the point of this post.) I wouldn't be nervous about using this part in an integrator with <<< 20 Hz cutoff having to slew a few 10's of millivolts. You ...