Search found 323 matches

by nclayton
Thu Feb 16, 2006 9:41 pm
Forum: Creative Recording
Topic: How would I invert an unbalanced audio signal?
Replies: 17
Views: 6523

You used the description 180? out of phase, which is a time-based measurement that is only accurate at one frequency. For example, a 180? phasse shift at 500Hz would be a delay of 1ms, not an inversion of the alternating current signal, and indeed at 1000Hz, that time-shift would be right back "in ...
by nclayton
Tue Feb 14, 2006 10:28 pm
Forum: Creative Recording
Topic: How would I invert an unbalanced audio signal?
Replies: 17
Views: 6523

I'm going to go ahead and say no, it's not possible to invert phase passively w/o a transformer of some kind. Well....a passive capacitor-inductor filter can theoretically do a 180 degree phase shift on an unbalanced signal, but only as long as there is no real resistance anywhere -- none in the sou...
by nclayton
Mon Feb 13, 2006 4:30 pm
Forum: Creative Recording
Topic: DIY 80hz low cut pad?
Replies: 16
Views: 4198

I feel like an idiot. I thought you said you wanted a pad AND high pass filter. By the time I get to the end of a thread I forget the beginning....

Ned
by nclayton
Mon Feb 13, 2006 11:12 am
Forum: Creative Recording
Topic: DIY 80hz low cut pad?
Replies: 16
Views: 4198

Here are a couple of pictures: http://www.cc.utah.edu/~nwc4396/HPpad.jpg The first one would be around -20dB (a fraction of a dB more) nominally, then 3dB more down at 80Hz, and falling at just a bit less than 6dB/oct because of the 150 ohm resistor after the caps. Because the 750 ohm resistors are ...
by nclayton
Mon Feb 13, 2006 8:58 am
Forum: Creative Recording
Topic: i need help with wiring piece of gear-electrodyne eq
Replies: 24
Views: 9830

Everything tough about figuring this thing's pin out from the pictures has something to do with that big black capacitor. the power connections and the input are for sure on the far side of the cap from the photo's perspective, and so the most important components for figuring that stuff out are blo...
by nclayton
Mon Feb 13, 2006 7:33 am
Forum: Creative Recording
Topic: Modifying an Altec 1588B Mic Pre for Higher Gain
Replies: 16
Views: 27286

FWIW...I just got a 1592b (unmodded), and it's a cool beast when pushed hard. Yeah, they're a nice little bargain. The unmodded channels are definitely cooler than the modded ones since they go through the summing/output amp for the extra gain and drive needed by a real mic preamp. I just like to m...
by nclayton
Sat Feb 11, 2006 9:49 am
Forum: Creative Recording
Topic: DIY headphone driver
Replies: 5
Views: 1628

A "2 Watt" driver will probably not make you happy. I always wondered about using a "70 Volt" output from a PA amplifier for this task as well, but never tested the concept. My interest on that path began to fall apart when studios and musicians *required* a zillion separate mixes for each performe...
by nclayton
Sat Feb 11, 2006 8:49 am
Forum: Creative Recording
Topic: Modifying an Altec 1588B Mic Pre for Higher Gain
Replies: 16
Views: 27286

Nice work on this 1592b. I've read your posts here on TOMB about it and also read the Ebay item page. I just got a 1592b, and I'm planning on doing similar work to it. For modding the 1588s, do you have any advice for opening those cans gently? Also, if you didn't care about balanced output for the...