Earphone (Line Out) to Mic In Recording Cable?

Question

I would like to connect Line Out / Earphone to my Recording Device that only has Mic In and no Line In

Basically I just have to convert Line Out signal which is around 500mV, to Mic In which is around 2mV.

How do I do this, I just put a resistor between two connection. If so, how many do I need and how much?

Answer 1

You need to make an attenuator, or "pad". A pad has a minimum of 2 resistor, most have 3, but 2 will work just fine in your case.

I have built a few of these in the past 10 years, so here's one that will work:

1. The shield connection will be common to both earphone and microphone jacks, and we'll call that 'ground'.

2. The tip of each connector (mic and ear) we'll call 'hot'

3. Connect a 10 k Ohm 1/8th Watt resistor (or any size 1/4W, 1/2W) between the 2 'hot' wires.

4. Connect a 100 Ohm resistor (any size, but 1/8th watt is best) across the 'hot' and 'ground' wires of the microphone jack.

5. As stated in item 1, make sure both 'ground' wires are connected together.

That should get you going.
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Answer 2

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RE:
Earphone (Line Out) to Mic In Recording Cable?
I would like to connect Line Out / Earphone to my Recording Device that only has Mic In and no Line In

Basically I just have to convert Line Out signal which is around 500mV, to Mic In which is around 2mV.

How do I do this, I just put a resistor between two connection. If so, how many do I...

Answer 3

I wouldn't suggest you do this.......

The line out connector creates it's own signal and delivers power in the process. The microphone jack is not capable of handling this. Even if you put a couple of resistors in between. It will work mind you, but at serious expence of you requipment. On top of that you will find you end up with a very distorted signal. It won't be quite as clear as you expect it to be. I would rather suggest you borrow a laptop or computer from a friend and make a digital recording through that, throw it onto a cd and Voilla!

If however you insist on going through with this, you will need to find out how many amps you are running at as well. The use the following formula:

(Max Voltage)/(Max amplitude) = Resistor power. Make sure of your units though. Do not mix mV for instance with uA.