I’m thinking to create a first gift for my newborn (ooopsss… he is not yet here, just about to). A small MP3 Player with tiny amplifier to drive a small speaker should be a nice idea. I will introduce him to music as early as I can. So this could be the right time.
After searching around, I finally find a small chip amplifier, TBA820. It’s a small, 8-pins DIP type, low power at 2 Watt maximum on B-Class. Not a bad as a start. I don’t play with A or AB-Class due to heat issue. The goal is small design, almost no heat, and could be powered with battery when needed. This TBA820 chip amp should be excellent stuff.
The finished kit shown as below. With around 5 VDC power from battery, it could drive my tiny 2″ mini speaker at quite loud volume. Nice!
The detail of the kit. It has tone control also (bass and treble adjustment). But I decided to remove this section.
A closer examination on the oscilloscope. At around 5 VDC supply and about 5.6R dummy load, I could get around 0.3 Watt. Not bad at all (considering no heat and the volume is loud enough).
It started to soft clip at about 0.4 Watt.
Even worst at about 0.45 Watt.
At full volume, almost 0.7 Watt, but we had a complete clipping here 😉 I think I could get higher Wattage with higher power supply, like 9 VDC or more. But that’s not the main objective, since at 5 VDC supply, the output was more than enough.
Kasan Santosa
September 20, 2010 08:30Oooh, TBA820 remembered me to my second project of DIY audio back on 90’s. Low hiss, no hum, only on/off switch thumb… You know, i’ve using this mini amp to drive a 10 inch, high-sensitive woofer feed-back input from 75hz low pass pre-amp. And it can produce sub sound. Amaizing right…
TeguhPS
September 23, 2010 02:22well pak Jim, I have introduced Mozart to my daughter when she was still in my wife’s womb. Using my sennheiser HD560 (now defunct..too bad), placed on my wife’s big belly :). Now she plays piano by herself, tried her best to play Mozart. And she even has ripped that same CD into her iPod..how about that?…
Auw Jimmy
September 23, 2010 09:33Amazing Opa… Need to learn from you… 🙂
Thanks.
zayyana
October 12, 2011 19:36how manyg the loudspeaker impedance
(berapa impedansi loudspeakernya)
Auw Jimmy
October 12, 2011 19:38Hi,
Around 4-8 Ohm.
Thanks.
Ryan Chandra
October 28, 2014 01:52Hi Bro Jimmy,
I wonder if you could give me a favour..
May I have the schema/circuit diagram of this TBA820 tiny amplifier kit, if you don’t mind.
Because I made a similar TBA820 mini amplifier recently (which schema is just the same with application circuit diagram as it’s shown in the IC datasheet). But the result is no good, it just didn’t work.
Thanks and regsrds,
Ryan
Auw Jimmy
November 3, 2014 19:51Hi Ryan,
That was a long time ago project and I think I followed generic design from Internet and it did work perfectly.
Thanks.