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metal
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« on: September 16, 2019, 04:54:51 04:54 »

I have a problem in my office where I usually use headphones for my mobile and PC audio, and I have to either two headphones for phone and PC and keep removing/putting them according to which audio I need, or use one headphone and move the 3.5mm Jack from phone to PC and vice versa. I know this sounds silly, but it is really annoying when you have to switch between the PC and phone audio during 8~16 hours everyday.

I want to make an audio switch which has two inputs and one output, any brilliant ideas!? audio switch IC recommendation is most welcome.
« Last Edit: September 16, 2019, 05:10:15 05:10 by metal » Logged
Sideshow Bob
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« Reply #1 on: September 16, 2019, 05:55:57 05:55 »

How are planning to power this thing using power from a USB port perhaps. Anyway In this situation I would perhaps have selcted the least hitech method like using a mechanical switch or a relay. As 3 pole double throw relays are quite common
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Old_but_Alive
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« Reply #2 on: September 16, 2019, 06:36:09 06:36 »

just use a rotary or toggle switch, 2 sockets, i plug, and a few bits of wire - simple
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« Reply #3 on: September 16, 2019, 07:43:07 07:43 »

you can use single cell switch using the 4016 in your situation need two and make XOR logic on command pins or, a simple R/C network can be put in place of the 20k pot to fade the audio
« Last Edit: September 16, 2019, 07:56:08 07:56 by xor » Logged

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Sideshow Bob
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« Reply #4 on: September 16, 2019, 08:08:51 08:08 »

you can use single cell switch using the 4016 in your situation need two and make XOR logic on command pins or, a simple R/C network can be put in place of the 20k pot to fade the audio
I think the 4016 has to high switch On-State Resistance to be used in a switch for headphones. I think even the 4066 may have to high switch On-State Resistance. So I am still in favor of a mechanical switch here.
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Mr. Spock
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« Reply #5 on: September 16, 2019, 11:58:08 11:58 »

Mosfet ?
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Signal
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« Reply #6 on: September 16, 2019, 12:20:45 12:20 »

There are bluetooth devices that can be paired with multiple audio sources and could be switched between on the fly by manipulating buttons on headset.
One of the first links from google search: https://www.businessinsider.com/plantronics-backbeat-500-bluetooth-headphone-review-2017-4
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enzine
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« Reply #7 on: September 16, 2019, 02:30:49 14:30 »

https://www.ebay.com/itm/3-5mm-Stereo-audio-Switching-Board-socket-2-IN-1-OUT-1-IN-2-OUT-CA/253225299876?hash=item3af5676fa4:g:83EAAOSwGMNbpFzs

Very simple and inexpensive
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metal
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« Reply #8 on: September 17, 2019, 01:51:51 01:51 »

The last one is an excellent idea! As Sideshow Bob, mechanical appears to be the best solution. I would then do sth like this:
https://www.ebay.com/itm/Nobsound-Little-Bear-Mc102-Mini-2-1-In-1-2-Out-3-5Mm-Stereo-Audio-Switch-Audio/202772854481?hash=item2f363436d1:g:VX4AAOSwC4NdckOd any idea about the resistance value of the volume control?
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« Reply #9 on: September 17, 2019, 05:12:33 05:12 »

hi
If you plan to use mechanical switch to choose between the inputs, put the volume control on the output, a 10k resistor will do, the wiper of the volume is the output, and either ends of the resisitor is the input, the other end is GND, but you have to use dual wiper volume control for stereo.
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Sideshow Bob
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« Reply #10 on: September 17, 2019, 06:17:09 06:17 »

Come to think about it there are infact Audio IC solutions that may fir your need well also like LM4836 it only needs a single supply max 5.5 volt. It has all you need,like input mux, DC volume control and mute And it is also in a TSSOP Package. It also look like you can score some on say ebay A mechanical switch may be quite attractive if you only want a simple switch. But as you start to ad functions like mute and volume controll. The part cost start to add up. 2 or 3 pole double throw switches and dual logarithmic potentiometers are not free. For your question about the  resistance value of the volume control. You can use that headphones for portable meadia very often have an impedance of 32 ohm @1KHz. So I guess you can start testing with a pot in the Kohm range
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metal
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« Reply #11 on: September 17, 2019, 08:00:29 08:00 »

The reason I need to do it myself is that the phone jack of the mobile is 4 rather than 3, this is sth I remembered today. sth like this for the phone and headphones 3.5mm plugs: https://uk.farnell.com/w/c/connectors/audio-video-connectors-adapters/audio-video-connectors/prl/results?no-of-contacts=4contacts&st=phone%20jack I think I will use a DPDT switch, LA4145 audio amplifier which I knew since I was 14yrs old, and the mic line will connect directly from the phone input jack to the output jack, no need for switching the mic.. https://uk.farnell.com/search?st=TS5A22362
« Last Edit: September 17, 2019, 08:09:48 08:09 by metal » Logged
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« Reply #12 on: September 22, 2019, 08:45:10 08:45 »

My vote goes to Bluetooth earphones. simple and easy
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« Reply #13 on: September 23, 2019, 09:40:57 09:40 »

It might not be exactly what you want (because you'll need a new pair of headphones) but I would also recommend bluetooth headphones.  The Bose QC3 can connect to two different sources at the same time. 
Might be an option to consider for the future. 
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« Reply #14 on: September 24, 2019, 05:41:49 17:41 »

This post is starting to sound like the old Irish joke about asking directions and being told not to start from here.
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« Reply #15 on: September 28, 2019, 12:15:27 00:15 »

This post is starting to sound like the old Irish joke about asking directions and being told not to start from here.

LOL
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« Reply #16 on: October 14, 2019, 01:00:30 13:00 »

Hello Metal,
I believe that you can do the job easily.
You can use a Latching Relay with 2 DPDT (change over contacts) i.e. one for the left and one for the right channel, and 2 switches to choose the input by changing the Relay's position.  
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metal
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« Reply #17 on: October 14, 2019, 01:40:57 13:40 »

Windows 10 1909 https://wccftech.com/windows-10-2020-18999-call-function-to-your-phone-app/
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« Reply #18 on: October 14, 2019, 06:45:35 18:45 »

why not play the audio from the pc via the mobile then you can control the audio with the phone.
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