---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Thu 04/20/06: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:54 AM - Re: Music wiring and switching (Brian Lloyd) 2. 07:16 AM - Re: Re: RV-List: Helmet & Headset ponderings (Brian Lloyd) 3. 07:34 AM - Re: (Brian Lloyd) 4. 07:41 PM - Re: Old Stuff (John McMahon) 5. 08:58 PM - Re: Old Stuff (glong2) 6. 09:36 PM - Re: Old Stuff (Richard E. Tasker) ________________________________ Message 1 _____________________________________ Time: 06:54:03 AM PST US From: Brian Lloyd Subject: Re: AeroElectric-List: Music wiring and switching --> AeroElectric-List message posted by: Brian Lloyd SteinAir, Inc. wrote: > Another way that is the easiest and quickest way around this issue with both > the -347 and the PMA8000x's is to just use one of the unused "switched" > inputs on the audio panel itself and forget about the actual music inputs. > Not many are actually using the ADF or DME inputs, They aren't stereo and not suitable for music. -- Brian Lloyd 361 Catterline Way brian-yak at lloyd dot com Folsom, CA 95630 +1.916.367.2131 (voice) +1.270.912.0788 (fax) I fly because it releases my mind from the tyranny of petty things . . . - Antoine de Saint-Exupery ________________________________ Message 2 _____________________________________ Time: 07:16:46 AM PST US From: Brian Lloyd Subject: Re: AeroElectric-List: Re: RV-List: Helmet & Headset ponderings --> AeroElectric-List message posted by: Brian Lloyd Richard E. Tasker wrote: > --> AeroElectric-List message posted by: "Richard E. Tasker" > > Your first answer was correct, but this is plain wrong. The audio > signal comes in from an entirely separate source than the noise > cancellation signal. There is no reason whatsoever that the cutoff > frequency has anything to do with the desired audio response. If you > have found this to be true with any design then the engineer doing the > design didn't know what he was doing. Uh, perhaps. Sometimes you can get a lot of consistency and stability by limiting the bandwidth of your servo. > Now, if you are talking about hearing someone talking to you NOT over > the intercom or airwaves, then, yes, attenuating (noise canceling) > frequencies in the voice band would make it more difficult to hear > them. But definitely NOT so for signals piped in through the phone cord. You can drive the main transducer from the audio input but the microphone in the ANR is still going to generate an out-of-phase signal for that too. The electronics needs to also cancel the desired audio signal coming in from the sensing microphone. It is not an easy problem and it is made much simpler by just separating the audio bands. When I was a kid about 10-years-old, I discovered the noise cancellation property when I had a microphone, an audio amp, and a headset. If I placed the microphone near the earcup of the headset everything got deadly silent. It was a cool phenomenon but I didn't quite grasp its significance. -- Brian Lloyd 361 Catterline Way brian-yak at lloyd dot com Folsom, CA 95630 +1.916.367.2131 (voice) +1.270.912.0788 (fax) I fly because it releases my mind from the tyranny of petty things . . . - Antoine de Saint-Exupery ________________________________ Message 3 _____________________________________ Time: 07:34:27 AM PST US From: Brian Lloyd Subject: Re: AeroElectric-List: --> AeroElectric-List message posted by: Brian Lloyd Nathan Ulrich wrote: > So, back to my original question. Any way to "split" the audio from the 396 > so it can feed both MUSIC 1 and MUSIC 2 without changing volume depending on > whether one or both is active? Here is what I did with my PMA-7000 which has the same set of dual music inputs, i.e. "front office" and pax. I installed separate jacks for the two inputs. I added a DPST switch to bridge the two inputs together. Switch on and both hear the same source. Switch off and I can put in different sources. Don't worry about the level going down when you tie the two inputs together. Their input impedance is pretty high compared to any signal source you will plug in. I doubt you will hear any level difference at all with them tied together. You can use a pair of DPDT switches to allow you to select between XM audio and external audio for each input. Imagine you have J1 and J2 (input jacks), and S1 and S2 (switches). J1 is the input for pilot and J2 is input for pax. S1 is selector for pilot and S2 is selector for pax. XM audio feeds one set of terminals for S1. J1 feeds other set of terminals for S1. Center terminals for S1 feeds pilot input to audio panel. J2 feeds one set of terminals for S2. Center terminals from S2 feeds pax input on audio panel. The remaining terminals for S2 connect back to the center terminals on S1. (I should make a schematic for this.) Here is your logic list: S1 position 1 -- pilot hears XM radio S1 position 2 -- pilot hears source from J1 S2 position 1 -- pax hear source from J2 S2 position 2 -- pax hear what pilot hears. Place J2 and S2 in the back seat. Now your pax can plug in their own source (walkman, diskman, iPod, etc.) and switch S2 and not bother the pilot. Good for kids who prefer Marky Mark to Frank Sinatra, or, worse still, pilot who is practicing scat solos. (I sing in a jazz ensemble and often practice while on long cross country flights. My kids definitely know what the "pilot isolate" switch does on the audio panel.) Hopefully this will solve your problem. -- Brian Lloyd 361 Catterline Way brian-yak at lloyd dot com Folsom, CA 95630 +1.916.367.2131 (voice) +1.270.912.0788 (fax) I fly because it releases my mind from the tyranny of petty things . . . - Antoine de Saint-Exupery ________________________________ Message 4 _____________________________________ Time: 07:41:13 PM PST US From: "John McMahon" Subject: Re: AeroElectric-List: Old Stuff --> AeroElectric-List message posted by: "John McMahon" Two Virgins Make Dull Company! True / Variation / Magnetic / Deviation / Compass heading How 'bout the one for resistor color stripes????? On 4/14/06, BobsV35B@aol.com wrote: > > --> AeroElectric-List message posted by: BobsV35B@aol.com > > > I kinda remember something about virgins in there too! I believe it > referred to the letter V. > > John McMahon Lancair Super ES ________________________________ Message 5 _____________________________________ Time: 08:58:24 PM PST US From: "glong2" Subject: RE: AeroElectric-List: Old Stuff --> AeroElectric-List message posted by: "glong2" John: Bad Boys Rape Our Young Girls But Violet Gives Willingly Black Brown Red Orange Yellow Green Blue Violet Gray White Eugene Long Lancair Super ES glong2@netzero.net -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of John McMahon Sent: Thursday, April 20, 2006 8:30 PM Subject: Re: AeroElectric-List: Old Stuff --> AeroElectric-List message posted by: "John McMahon" Two Virgins Make Dull Company! True / Variation / Magnetic / Deviation / Compass heading How 'bout the one for resistor color stripes????? On 4/14/06, BobsV35B@aol.com wrote: > > --> AeroElectric-List message posted by: BobsV35B@aol.com > > > I kinda remember something about virgins in there too! I believe it > referred to the letter V. > > John McMahon Lancair Super ES ________________________________ Message 6 _____________________________________ Time: 09:36:45 PM PST US From: "Richard E. Tasker" Subject: Re: AeroElectric-List: Old Stuff --> AeroElectric-List message posted by: "Richard E. Tasker" Are you asking, or just commenting on the fact that is rather off color :-) . Dick Tasker John McMahon wrote: >How 'bout the one for resistor color stripes????? > -- Please Note: No trees were destroyed in the sending of this message. We do concede, however, that a significant number of electrons may have been temporarily inconvenienced. --