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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

LM386 issues

Homebrew

New Member
Hi Guys....

I am new to these forums so i hope i have this post in the right section, i just built a FM receiver with a LM386 to amplify my signal, i had a problem with it making a terrible squealing sound, i found a circuit for an LM386 amplifier and it showed extra capacitors added, one across the supply rail and one from pin 1 to pin 8, i added these and all is relatively quiet now, the problem i am having is that i get no output untill i scope the input, (pin3) then i can hear music and talking from the radio circuitry, can i just add a small capacitor from pin 3 to ground to replace the scope probes capacitance or is there something else going on? I have been away from electronics for 24 years so am a little rusty :)
 

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