Connect Amplifier to Earphone

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Connect Amplifier to Earphone

Postby ailexs » 26 Jun 2017, 09:54

Dud… :scratch:
I m working on building amplifier based on TDA2822 which receives input from my phone and feeds them into a small 2″ speaker provided by 9 v battery.
I connected the circuit but am not understanding 1 thing…
I bought a new earphone and removed its wires..(cause such wires are not available in my area) then i stripped the insulation of left earphone. I got tho wires inside.
I m not understanding where to connect those wires to input of amplifier …. So please comment on how to give inputs to that amplifier.
I mean…. I got 2 wires…. One red and one coppery color…on breaking left earphone…. And other 2 wires… Red and coppr again… An breaking right earphone… amp circuit diagram says that red of left earphone to be given to pin 6 and red of right earphone to pin 7… What to do of remaining teo copper wires??
The datasheet of TDA822
my TDA2822 became too hot after an hour of using it…..so i want to know which amp is small in size but provides undistorted o\p with in voltage 3V and above… it should be ultra small and no external caps, resistance etc…..

and which is best small amp??
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Re: Connect Amplifier to Earphone

Postby phatt » 27 Jun 2017, 09:55

ailexs wrote:Dud… :scratch:
I m not understanding where to connect those wires to input of amplifier …. So please comment on how to give inputs to that amplifier.
I mean…. I got 2 wires…. One red and one coppery color…on breaking left earphone…. And other 2 wires… Red and coppr again… An breaking right earphone… amp circuit diagram says that red of left earphone to be given to pin 6 and red of right earphone to pin 7… What to do of remaining teo copper wires??
The datasheet of TDA822


You have stereo,, so 2 hot signal wires go to pin 1 and 16 and the other 2 ground wires go to Circuit Common or ground. Circuit common is also pin 4,5,12 and 13 on the chip.
Pin 6 and 11 are speaker outputs,, Resistor RL is the speaker (Load).
The flat line at the bottom of all the passive components is also circuit Common.

ailexs wrote:my TDA2822 became too hot after an hour of using it…..so i want to know which amp is small in size but provides undistorted o\p with in voltage 3V and above… it should be ultra small and no external caps, resistance etc…..


Small chips on low voltage are unlikely to give a clean output especially with big distortion and booster pedal circuits.
I doubt many exist, most chip amps require some external passives to work.

ailexs wrote:and which is best small amp??


Other may know more about that, at such small power it's hardly worth trying to improve.
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Re: Connect Amplifier to Earphone

Postby rymonsandy » 08 Jan 2018, 11:17

I was at a cousins house and he had this adopter thing which was like a small piece of metal that you plug your headphones into and the n plug it into the amp. his came in a kit his mom bought him so he don't know what they are called. please help me find this.... it didn't look like it'd cost more then 5 bucks. link please?
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Re: Connect Amplifier to Earphone

Postby FiveseveN » 08 Jan 2018, 15:19

rymonsandy wrote:plug it into the amp

Plug it into what, the speaker output? Line level? Headphone out?!
Was it a simple 6.3 to 3.5 mm adapter?

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Re: Connect Amplifier to Earphone

Postby modman » 08 Jan 2018, 16:42

rymonsandy wrote:I was at a cousins house and he had this adopter thing which was like a small piece of metal that you plug your headphones into and the n plug it into the amp. his came in a kit his mom bought him so he don't know what they are called. please help me find this.... it didn't look like it'd cost more then 5 bucks. link please?

Why don't you ask your cousin, or his mom?
Surely the amp had a headphone output, if you connect it to the speaker output, it will blow up half of your headphones.
"The whole point of diy is diy. It's not dsoiyathodtr - do some of it yourself and then have others do the rest" (paulc)

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Re: Connect Amplifier to Earphone

Postby Jan1966 » 08 Jan 2018, 19:33

kit his mom bought him so he don't know what they are called.

What was the kit? Did he read the packaging or instructions. That might give you a clue to what you need.
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Re: Connect Amplifier to Earphone

Postby rymonsandy » 12 Jan 2018, 08:02

Hello,

Thanks for the reply, My cosine suggests me a website which is really good and provides branded earphones at an affordable price.:)
Here is the website:
https://www.mightyape.co.nz/electronics/headphones

I think you should try this. :D 8)
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Re: Connect Amplifier to Earphone

Postby FiveseveN » 12 Jan 2018, 08:55

Spam and trigonometry, eh? These bots are getting clever :D.
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