I plan to build a very small, 9V/adapter powered amplifier, with diode clipping distortion, if possible.
I see that most of these schematics only use a LM386 chip.
I do not have this chip, however, I have several 4558 chips.
Can I use the 4558 chip in place of the LM386 for a mini amp?
Cusp of Magic
no, a 4558 is a op-amp chip, low slew and low amplification with totally the wrong output impedance and nowhere enough power, the 386 is a power amp chip, designed to drive a speaker at about 0.5 watts.

the LM386 is about £2 ($3) on eBay

edit: the lm386 also has a few funky extra functions like bypass which allows cool mojo
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Last edited by GABarrie at Sep 14, 2011,