That looks like a variation of a gyrator:
http://en.wikipedia.org/wiki/Gyrator
Bri
Search found 1165 matches
- Sat Jan 26, 2008 10:31 pm
- Forum: Creative Recording
- Topic: my q is too tight
- Replies: 10
- Views: 3619
- Sat Jan 26, 2008 10:26 pm
- Forum: Creative Recording
- Topic: QQ: where can one get 'blank'/uncut racks for gear?
- Replies: 15
- Views: 5222
- Sat Jan 26, 2008 10:24 pm
- Forum: Creative Recording
- Topic: Altec Lansing 1210: anybody??
- Replies: 9
- Views: 5376
- Sat Jan 26, 2008 12:41 am
- Forum: Creative Recording
- Topic: Altec Lansing 1210: anybody??
- Replies: 9
- Views: 5376
- Fri Jan 25, 2008 11:16 pm
- Forum: Creative Recording
- Topic: Altec Lansing 1210: anybody??
- Replies: 9
- Views: 5376
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.)...
- Fri Jan 25, 2008 9:31 pm
- Forum: Creative Recording
- Topic: Source for germanium transistors? (besides e-Bay)
- Replies: 8
- Views: 2841
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...
- Fri Jan 25, 2008 9:24 pm
- Forum: Creative Recording
- Topic: Input impedance
- Replies: 24
- Views: 8442
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...
- Fri Jan 25, 2008 9:19 pm
- Forum: Creative Recording
- Topic: Input impedance
- Replies: 24
- Views: 8442
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...
- Thu Jan 24, 2008 11:07 pm
- Forum: Creative Recording
- Topic: Input impedance
- Replies: 24
- Views: 8442
- Thu Jan 24, 2008 9:17 pm
- Forum: Creative Recording
- Topic: Input impedance
- Replies: 24
- Views: 8442
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 ...
- Thu Jan 24, 2008 1:31 am
- Forum: Creative Recording
- Topic: Alternative Op Amp
- Replies: 4
- Views: 1738
TI is offering these as an "upgrade", but I've never tried them.
http://focus.ti.com/docs/prod/folders/p ... e2074.html
Bri
http://focus.ti.com/docs/prod/folders/p ... e2074.html
Bri
- Tue Jan 22, 2008 11:56 pm
- Forum: Creative Recording
- Topic: bridge rectifier (?) question. its a simple one.
- Replies: 5
- Views: 2240
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...
- Tue Jan 22, 2008 11:52 pm
- Forum: Creative Recording
- Topic: modding the attack/release times on compressors
- Replies: 18
- Views: 8530
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...
- Tue Jan 22, 2008 1:43 am
- Forum: Creative Recording
- Topic: Otari MX5050 MKIII-2 problem
- Replies: 11
- Views: 4299
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" ...
- Mon Jan 21, 2008 8:53 pm
- Forum: Creative Recording
- Topic: Otari MX5050 MKIII-2 problem
- Replies: 11
- Views: 4299