Sean Cody Streaming Free Iphone

Tip of the Day: How do I turn the startup sound of my Macs a silent and for all?

Why does my Mac I normally say that he's fine, that I know. If you have a Mac

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Separate headphone with a stereo interface? Thanks Apple!

. Finally a Mac feature that can really save money thanks to the

Many musicians, myself included, have probably asked yourself: now I've had a high-quality stereo interface, and can still create a dedicated headphone, no matter whether

GarageBand, Logic , Live sequencer or another, whether to exploit a home recording or as a DJ or just to all its flexible inputs and outputs to a theoretically available.

Good news for Mac users because Apple
has long been in his

OSX

CoreAudio Services

accurate account of that case.

Only a few know, however, likely that they are wasting their resources and perhaps unfounded expensive audio interfaces just buy from the above-described reason. With the built-in

Apple

OSX

Audio MIDI Setup in the utilities, it can happen all of its inputs and outputs as the line-in and headphone output of a MacBooks
with any other audio interfaces to to combine a single, as it were, virtual interface, which can then eg in

Apple Logic or can use other software as an audio device. only prerequisite for this is that all devices are being combined to work with the same sampling rate or sample rate. This, unfortunately, I had to figure out when I tried my SonyEricsson Bluetooth headset with my
Novation X-Station

cross. But no matter. Let me briefly explain how you a combined interface (for the nerds among us

A

ggregated Device

) drawn up under OSX and finally an example of can use Logic Pro 8 .

Sets First make sure that all of the devices you want below together into a well connected and have your Mac recognizes it correctly (which I now just go out). then Open the Audio MIDI Setup

, which should be in your Utilities folder, or if you want to go the short way it opens with spotlight on CMD + Space and type in the name.

It should now open a window that looks not unlike the following hopefully. This interests us but not once, but then we stay on the menu and open the audio for many users safe unknown device editor, like by using the key combination Shift + CMD + A

.

opens a list of all your audio devices that provide
CoreAudio

inputs and outputs, be it software or hardware. But first of all, you have a new

Aggregated Device build on the little plus at the top of the window. Give it a meaningful name (especially if you want to work later, perhaps depending on the situation with several of these "virtual" interfaces) in my case goes Mydevices . Now you can check the box next to your "real" devices to decide which inputs and outputs to use your integrated interface.

MacBooks, which I will use later for the headphone mix, my admittedly not very professional but quite practical

Logitech headset that I will get in touch with the headphones, as a kind of talk back and my current recording interface, a small but nice synth from Novation of the condenser microphones and monitor speakers hanging. You can already see that to be true in the two inputs and two outputs on my interface than three inputs ( Logitech and interface) and all six outputs. ( Logitech , interface and integrated output of the MacBook )

The order of the units can be changed as needed by the way drag and drop. The result of that move then the outputs of the "virtual" interface. In my example, would therefore output 1 & 2 the integrated output, 3 & 4 of the headsets and 5 & 6 of the synths. It should be remembered well, especially for the next step in the audio host program or write it better, so you can assign everything after the fact.

1. But with a spirited click on "Finish " we leave this menu again. The points Clock
and
2. Resample
   to us for the time being remain uninteresting.
   
   
   
   
   
   we come to practice. For me it means
   
   Apple Logic Pro 8 , but all future steps are also nearly one-to- one on all the other "professional" sequencer transferred.
   
   
   
   
   After we have created a new project (which also works for old projects), we look just at our audio setup and Tadaa! Our
Mydevices
3. was recognized properly as expected and can now be selected as the device in Logic
   
   .
   
   
   
   
   
   
   
   
   
   
   What does this mean to us now?
   
Quite simply, our sequences of this "virtual" interface exactly the same treatment as any other compatible device and we in our Channels, busses, sends, and sums these inputs and outputs to fall back.
4. 
   
   
   Here's an example:
   
   
   
   
   
   I have prepared a backing track for a singer. I am in my direction and listen on demand over my monitors or
   Logitech headset
   my voice, that outputs 5 & 6 from. The singer, however, gets on an AUX send an individual headphones to his wishes with effects and everything that goes with it, without affecting my mixture. He listens to source 1 & 2 in the headphones to the recording room. I need the headphones plug only into the headphone output of my MacBook
   
   . In addition, I could give him now the microphone signal my headset (input 1 in my case), sent to his headphones and have made the communication. (It is the story with the headset could of course solve on the Mac internal microphone). And so the whole thing could look like in Logic (HP_Mix is in this case, of course, for Headphone Mix):
   
5. 
   
   
   
   
   
   
   
   
   I do not want now delve into the signal flow in Logic
   this is only a Example. Use of Aggregated Devices
   
   I can imagine very well as a laptop DJ, with the stereo output of the interface to the mixer and the PA and it goes through the headphone output of the Mac has the option of pre-listen tracks. Let what you think. I'm very curious about your use of this, I think, unique features what Apple
   
   poses as available. If questions or problems, just write or reply to this post, then have everyone else share in the solution.

Until then, I hope this tutorial showed you a little, what great opportunities sometimes discover hidden behind small menus.

In the sense

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The beginning has been made ...

Just another blog was born ...

Well, now it has been quite irritated herself somehow to start a little blog. It is after all not everything around it. But instead of you, dear readers, with minor details a la Twitter terror over what I have to tell just cook or that again, nothing comes on TV, I try to love this blog more or less to keep professional and much more on small achievements to report findings and news on our / my everyday life too much engineered to enrich in the hope of all of us know anyway. Forgive me this banter. In my next life I'll doctor promised your John

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protection measures for the power amplifier circuit with BJTs

Start Blog ppdriver
experimental circuit with BJTs

protection measures for the power amplifier in the power amplifier

In a booster, it can happen that a defective output tube work. To other tubes and the amplifier to protect themselves, protective measures must be taken. These are described here.

grid emission or insulation failure may cause a small grid current. In conventional circuits with Gitterableitwiderstand calls this current a voltage drop on Gitterableitwiderstand, which counteracts the negative bias. As a result, the plate current swings high at first unnoticed, leading to the destruction of the tube and the apparatus. This is one of the most common causes of errors in conventional tube radios and amplifiers and is especially happy after overloading the output tube. The galvanic Coupling avoids this known. The grid would have to complete the rest of the current Katodenfolgers take in order to distort the lattice strain dangerous. In this respect, the electrically to the output tube (s) coupled Katodenfolger a very effective measure against this effect.

course of Katodenfolger can even be dangerous when he has a lattice Katodeschluss or even worse, makes a rollover to the anode. The latter is quite possible if the anode is connected to the anode of the Katodenfolgers pentode. The grid of output tube may be destroyed. To counteract this helps a resistor, which is comparatively small signal not should be recognized as a series resistance. With push-pull circuits, which can very elegantly realized with a common protection for resistance in both push-pull working Katodenfolger. If this resistance is correspondingly high resistance or even a power source, so you get a FREE anode coupled differential amplifier .

A very hot potato is a grid-Katodenschluss in an output tube. This also applies to parallel output tubes. The current flow may not raise enough from the line fuse, which in case of failure of the negative bias may still be possible. A protection circuit that also in case of negative bias or a grid in an output tube Katodenschluss appeals should therefore be missing in any power amplifier. How is the 6 x EL34 amp is made, the diagram shows

Here comes again the galvanically coupled Katodenfolger as rescuers into the game. Without taking into account the need for coupling caps, it makes it relatively low-Sense 56KΩ resistors of the current node P (P = Protect) to lead. If the current at node P has a minimum value, here about 1mA, open collector off the stage in the amplifier existing STBY and anode voltage delay circuit immediately on standby, ie anode-energized when an error in the final stage occurs. The electro-mechanical analogy, would be a relay which drops at low 1mA.

A few additional 0.8 mm holes and the circuit is already accommodated on the board of the amplifier.

This work is licensed under a Creative Commons Attribution
-Noncommercial-No Derivative Works 2.0 United States License .