lm386 amp on a breadboard - oscillation

[icon]

Hi

Is it even possible to make an amp on a breadboard that doesn't oscillate? I had an LM386 kicking around, so I thought it would be amusing to wire it up, listen to some music while I play. I made the 'minimum parts count' layout from the data sheet, which has a 250uF cap in series with the speaker, and a 50nF cap/10R resistor in series to ground (from the output).

It buzzed horribly to start with, but I twisted the speaker wires together and put a 100uF cap in parallel with a 10nF cap directly across the power supply pins. Now no buzz, but it oscillates at 690kHz. Sounds kind of OK, and doesn't draw a huge amount of current (20-30mA), but it would be nice if it didn't oscillate!

Any ideas how I can tame it?

Many thanks
John

[Rerouter]

10nF cap between inverting feedback pin and output pin,

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Thanks, I'll give that a go.

John

[blackdog]

Hi Icon, :-)


Do not forget to use a capacitor from pin7 to ground, say 10uF (Bypass).
And the zobel network on the output, 10-Ohm and 47nF on pin-5 (output)
It is all in the datasheet, firtst page.

Minimum components circuits is asking for troubles 

Kind regarts,
Blackdog

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The bypass capacitor on pin 7 seems to have mostly done it - still a very slight wobble at ~700KHz, but there's too many wires trailing around...

Thanks
John