Search found 1165 matches

by brianroth
Sat Jan 26, 2008 10:31 pm
Forum: Creative Recording
Topic: my q is too tight
Replies: 10
Views: 2069

That looks like a variation of a gyrator:

http://en.wikipedia.org/wiki/Gyrator

Bri
by brianroth
Sat Jan 26, 2008 10:26 pm
Forum: Creative Recording
Topic: QQ: where can one get 'blank'/uncut racks for gear?
Replies: 15
Views: 3389

Check around for local "trophy" shops, which do a lot of one-off engraving.

Bri
by brianroth
Sat Jan 26, 2008 10:24 pm
Forum: Creative Recording
Topic: Altec Lansing 1210: anybody??
Replies: 9
Views: 3872

I dunno...I prefer live rooms, myself! <g>

Bri
by brianroth
Sat Jan 26, 2008 12:41 am
Forum: Creative Recording
Topic: Altec Lansing 1210: anybody??
Replies: 9
Views: 3872

Dusty Archives (scan of ancient pages):

http://www.brianroth.com/library/altec/

Bri
by brianroth
Fri Jan 25, 2008 11:16 pm
Forum: Creative Recording
Topic: Altec Lansing 1210: anybody??
Replies: 9
Views: 3872

In the latter years, a lot of Altec-branded electronics gear was built here in OKC. Sigh...it was a sad day when the old University Sound/Altec factory plant went dead. (Sidebar: eons ago, when I was in high school, a University Sound engineer gave me a factory tour, including the anechoic chamber.)...
by brianroth
Fri Jan 25, 2008 9:31 pm
Forum: Creative Recording
Topic: Source for germanium transistors? (besides e-Bay)
Replies: 8
Views: 1835

i'm not that happy with the fuzz pedal i recently built. i'll order some germanium transistors and see if that makes my casiotone sound like fella kuti's organ (not the one his 20 wives enjoyed, the other one.) Be aware that most germaniums are PNP, while silicon transistors can be either PNP or NP...
by brianroth
Fri Jan 25, 2008 9:24 pm
Forum: Creative Recording
Topic: Input impedance
Replies: 24
Views: 5519

As discussed in the Shure article that Rod linked, modern systems use a "bridging" topology, with a low source impedance driving a comparatively high load Z. This maximizes the transfer of voltage. So, impedance mismatches are a relatively uncommon problem. One area where a problem can arise is usin...
by brianroth
Fri Jan 25, 2008 9:19 pm
Forum: Creative Recording
Topic: Input impedance
Replies: 24
Views: 5519

You can TRY the "diddle the pot" method with balanced inputs, but the results may not be accurate with electronically balanced ins or outs, depending on the circuit design. The pot trick WILL work when transformer I/Os are involved. Hmmmm...maybe a 2-gang pot might work (one section in series with t...
by brianroth
Thu Jan 24, 2008 11:07 pm
Forum: Creative Recording
Topic: Input impedance
Replies: 24
Views: 5519

"Seat of the pants" test method.

Bri
by brianroth
Thu Jan 24, 2008 9:17 pm
Forum: Creative Recording
Topic: Input impedance
Replies: 24
Views: 5519

Quick and dirty way to check (approx.) input impedance, specifically for an unbalanced input: 1. Locate a potentiometer with a value *higher* than what you guesstimate it will be. I'd start with a 50K pot for newer gear. 2. Wire the pot in series with the "hot" audio lead between a signal generator ...
by brianroth
Thu Jan 24, 2008 1:31 am
Forum: Creative Recording
Topic: Alternative Op Amp
Replies: 4
Views: 1136

TI is offering these as an "upgrade", but I've never tried them.

http://focus.ti.com/docs/prod/folders/p ... e2074.html

Bri
by brianroth
Tue Jan 22, 2008 11:56 pm
Forum: Creative Recording
Topic: bridge rectifier (?) question. its a simple one.
Replies: 5
Views: 1310

sorry, its probably a transistor. my bad. here's a schematic of the board, it is the M-BOARD : http://bermuda.ucd.ie/bridge/cs80/cs80_circ5.jpg if i trace the +14v leg of the transistor(?), it comes directly from one of the incoming wires to the board. so if someone can confirm that a 3-legged beas...
by brianroth
Tue Jan 22, 2008 11:52 pm
Forum: Creative Recording
Topic: modding the attack/release times on compressors
Replies: 18
Views: 5925

Of course it probably wont work so easily for an optical compressor. The attack/release time constants for an opto compressor are almost always due to the response of the photoresistors. Example: in the LA-2/3, the audio signal is used to directly drive the electroluminescent panel, so the "time co...
by brianroth
Tue Jan 22, 2008 1:43 am
Forum: Creative Recording
Topic: Otari MX5050 MKIII-2 problem
Replies: 11
Views: 2544

Re. the Otari...maybe a short "spritz" of QD contact cleaner into the guts of the switch might kerp it heatlthy got awhile. Re. syncing....that is tricky. At a minimum, you will require something like a Lynx unit, or at least a MOTU "MIDI Timepiece". Digidesigns also sold a "Universal Slave Driver" ...
by brianroth
Mon Jan 21, 2008 8:53 pm
Forum: Creative Recording
Topic: Otari MX5050 MKIII-2 problem
Replies: 11
Views: 2544

nate wrote:
brianroth wrote:I can be the speed selector switch itself.
Do you charge by the hour or by the job? :lol:
LOL...

So, did the problem get fixed?

Bri