tag:blogger.com,1999:blog-2333275525623588663.post3700666512691717316..comments2016-07-11T04:43:03.373-07:00Comments on Hands On - Make: More Electronics: Experiment 12 (Chapter 12) - James Floyd Kelly (Jim)http://www.blogger.com/profile/13876934942928389738noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-2333275525623588663.post-14925128175283586212015-10-24T11:04:33.160-07:002015-10-24T11:04:33.160-07:00When I built the circuit I didn't understand w...When I built the circuit I didn't understand why the audio output from the LM386 was so noisy and distorted. I rechecked all my wiring, cut down leads so they were short and still a terrible hiss from the speaker and distorted tones. I couldn't believe that the LM386 performance was designed to be this crappy. It sounded a lot like your example in the video above. Essentially useless as an audio amplifier. Something else had to be wrong. I used a function generator to make a 1kHz sine wave tone and played it though a speaker into the microphone. Result, nasty crunchy noise from the amplifier. I used an oscilloscope to measure the output from the 741 alone without the LM386 in the circuit. Result.... clean smooth waveform at the 741 output. I checked the output from the LM386 connect into the cirucuit. Result...ugly, noisy crap. Then I put a 1000 uF electrolytic across the power supply buss from Vcc to GND as Mr Platt had suggested. Result....beautiful clean tone. I checked my bench top power supply and it seemed to be providing clean voltage. I don't know why the there was so much noise on the power supply buss lines on the breadboard but boy did using a big cap to filter it all out work wonders! Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2333275525623588663.post-73373356674179318252015-05-19T23:45:43.775-07:002015-05-19T23:45:43.775-07:00Great post about elektroonika.Thanks so much for y...Great post about <a href="http://www.1a.ee/" rel="nofollow">elektroonika</a>.Thanks so much for your sharingAnonymoushttps://www.blogger.com/profile/05208782673932880310noreply@blogger.com