An alternative to the LM-386

TDA2822

As a (now-retired) broadcast engineer, I grew to hate the LM-386.  It always seemed to me to be difficult to control and to be prone to oscillation.

My own solution was to switch to another chip for audio amps.  My own choice was the TDA2822.  It’s inexpensive and easily available from Mouser, Digikey and others.  It’s a dual amp, which is handy for stereo, but I use it in bridge mode even when I design mono amps.  My choice is the SOIC-8 package, which is large enough to be easy to use, but also saves pc board space over the DIP-8 that’s usually used on LM-386 chips.

My general tips are to carefully bypass the power supply for whatever chip you use.  I’ve often used 4.7 ohms or so in the supply line, and tried to bypass it close to the chip with an electrolytic, a .1 uF and a 20-100 pf chip capacitor.

But the MOST important tip for taming IC audio amps is to connect a small capacitor (I’ve usually used 33 pf chip caps) between the inverting and non-inverting inputs.  It tamed lots of otherwise-troublesome amps for me.

Andrew Ellis, NO6E, is a special contributor to AmateurRadio.com and writes from Oregon, USA. Contact him at [email protected].

Leave a Comment

Subscribe FREE to AmateurRadio.com's
Amateur Radio Newsletter
News, Opinion, Giveaways & More!

E-mail 
Join over 7,000 subscribers!
We never share your e-mail address.



Also available via RSS feed, Twitter, and Facebook.


Subscribe FREE to AmateurRadio.com's
Amateur Radio Newsletter

 
We never share your e-mail address.

Please support our generous sponsors who make AmateurRadio.com possible:

KB3IFH QSL Cards

Hip Ham Shirts

Georgia Copper

Ham-Cram
Expert Linears

morseDX

Ni4L Antennas

N3ZN Keys

West Mountain
R&L Electronics


Do you like to write?
Interesting project to share?
Helpful tips and ideas for other hams?

Submit an article and we will review it for publication on AmateurRadio.com!

Have a ham radio product or service?
Consider advertising on our site.

Are you a reporter covering ham radio?
Find ham radio experts for your story.

How to Set Up a Ham Radio Blog
Get started in less than 15 minutes!


  • Matt W1MST, Managing Editor




Sign up for our free
Amateur Radio Newsletter

Enter your e-mail address: