Simple ULF on TDA2003

Today we will assemble a simple mono audio amplifier using the TDA2003 chip.

The TDA2003 chip can be removed from an old radio or bought on the radio market.
Other details too.

Here is the amplifier circuit:

The amplifier is powered by 3-12 volts.
The sound source can be a player or a phone.
This circuit can be easily assembled by hanging installation.
My design fits into the housing of the music angel speaker.
Here's what I got:

Exterior view:

Inside view:

I did it extremely sloppily, but I think you should do better.

You can also, if desired, make an operation indicator, a toggle switch and a charging port.

Here's the speaker:

I recommend placing a capacitor between the two contacts (I set it to 47 uf).

Thank you for your attention.

come back

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Comments (19)

#1 feelloff Guests 14 March 2013 19:02
8

What a nightmare! The author is very neat))))))
- Answer
#2 wefl Guests 22 March 2013 22:40
1

but it seemed to me that there are 2 outputs from the phone or player, but here it is 1 and grounding is a minus, if it is connected to it, at least indicate this
- Answer
#3 Arseny Guests March 29, 2013 10:46
5

I'm 10 years old, I made this unch on tda. I have 2 speakers paralleled at 3.2 ohms sony. low and
high frequencies go well, ms gets a little warm between legs 2 and 4, install a 4.7 microfarad non-polar condenser and everything will be fine
- Answer
#4 Victor Guests 6 June 2013 19:44
2

Quote: Arseny
I'm 10 years old, I made this unch on tda. I have 2 speakers paralleled at 3.2 ohms sony. low and
high frequencies go well, ms gets a little warm between legs 2 and 4, install a 4.7 microfarad non-polar condenser and everything will be fine

Put the mikruha on the radiator... it won't heat up that much
- Answer
#5 111 Guests 15 August 2013 20:11
2

How do you charge the battery? There's a Nokia BL5C there, right? I just don’t know how to protect it from overcharging.
- Answer
#6 Naer Guests 17 August 2013 18:27
0

Quote: 111
How do you charge the battery? There's a Nokia BL5C there, right? I just don’t know how to protect it from overcharging.

As usual... Through a USB charger, when the battery is charged, the battery power controller automatically turns off
charging..
- Answer
#7 111 Guests 29 August 2013 15:33
1

Exactly. I confused myself. I forgot that phone batteries have protection. By the way, I assembled the circuit a long time ago, it works, but it’s better to install a small choke in addition to the capacitor (on + or -, it doesn’t matter), you’ll get a kind of low-pass filter, so at high volume there’s almost no wheezing.
- Answer
#8 newbie Guests 22 November 2013 23:15
0

Please take a photo of the 0.1uF capacitor
- Answer
#9 kshmkshmmm Guests 23 November 2013 18:57
1

how to remove noise. How to replace the radiator?
- Answer
#10 Dmitriy Guests December 17, 2013 04:28
0

3rd contact minus? And grounding from the conductor, rezyuk, and omnic is also a minus?
- Answer