Connect Amplifier to Earphone

Tube or solid-state, this section goes to eleven!

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??
ailexs
 
Posts: 2
Joined: 14 Apr 2017, 07:14
Has thanked: 0 time
Have thanks: 0 time

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.
Phil.
phatt
Diode Debunker
 
Posts: 926
Joined: 04 Aug 2010, 06:17
Location: Morayfield SE Qld AU
Has thanked: 0 time
Have thanks: 230 times


Return to Amplifiers

Who is online

Users browsing this forum: No registered users and 6 guests