Wednesday, March 19, 2014

How to instal a headphone jack, so that the speaker is off when you plug your headphone in?




Adriaan


Im building a shortwave radio the conrad shortwave radio kit


Answer
Three ways.

For lower power (3W or less), you use an interrupter jack, where for each channel there is an input and output terminal and one ground for both. The speaker connects to the NC terminals and ground. When you plug headphones in, the contact mates with the plug and disconnects from the speaker.

For over 3W, you use an isolated switch, where there is an electrically isolated switch contact (or two), which are often double throw. With such a switch NC goes to speaker, common to amplifier out, and NO through a 150 ohm 1/4W resistor to the headphone contact for that channel. I used to see that arrangement in smaller stereo systems.

The third is pretty new. An isolated switch in the jack, or another sleeve terminal (which a normal headphone plug will short out), provides a logic signal which mutes the main speaker amp, unmutes the headphone amp.

Home Studio Recording... Computer & Recording Kit?



Hi,
I am a singer, guitarist & piano player & I would like to set up a little studio at home...

The Recording Set I'm looking at getting has:
1x iSK RF-2 Vocal Booth / Reflection Filter
1x iSK BM-700 Condenser Microphone
1x HP-580 Monitoring Headphones
1x iSK SPS014 Pop Filter
1x iSK ARF Vocal Booth Stand
1x Microphone XLR Cable - 5m

Is that okay just to start off with? It's $300 off Swamp Industries (If that helps)

ALSO What would be the best computer and software to use?
I was looking at a MacBook Air...& people say Audacity's good for recording?

If you have any other tips or ideas or other sets that'd be better please tell me!

Thankyou! :)
I have to buy an Ipad anyway for school next year, so could I even use that?



Answer
It's nice to get everything all at once. 8^)

I have a couple of things though. First of all, in the demo clips for the mic it actually sounds pretty bad! It looks like a good mic but it doesn't sound as good as it looks. You'd think the samples they put on the website to sell the thing they could get it to sound better. (In one sample, 'customer supplied' of a solo guitar it sounds very good! But not in the VOICE sample. And you're a singer, right?)

Second, if you plan to plug it into a computer, not a mixer or professional pre-amp, why are you getting an XLR connector? I mean where are you going to plug an XLR connector into your computer? Wouldn't it be better to get a USB mic if you're going to be recording on a computer with just one mic??

(You can get an XLR/USB converter, with the phantom power you need also, but that's more money! But you can get a USB mic. for about what this one costs. Look on EBay and you could get a good used one for half the money!)

Third, the mic comes with a wind/pop filter, so why are they selling you another one? (Or are they just mentioning it in the kit to make it look like something extra?)

Finally, you will also need some audio recording/editing/mixing software. Audacity will work great, and it's free, but there are other moderately-priced products out there that are better. Strange it wouldn't be included in his website selling all the other stuff you need. Plus when you get the microphone you'd wonder where you're supposed to plug in this strange three-prong plug. 8^)




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