| jovial_cynic |
Hey folks -
I've been dabbling with some DIY audio schematics, and managed to cobble together the LM386 Little Gem amp, and I'm onto my next project.
I've got a KA4558 op-amp chip handy. All the schematics I've seen show similar op-amp chips used in pre-amp circuits, and not in actual amplifier circuits.
Can the KA4558 or similar op-amp chips be used to make a small practice amp, or are they only useful in the pre-amp circuits? |
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| Cal Weldon |
| Hi and welcome to the forums. You might wish the post the question in another forums as not everyone looks in here. |
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| jovial_cynic |
| Thanks! Will do - |
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| Lsharptec1 |
jovial_cynic,
The KA4558 is a common replacement for any of the 4558 family of dual opamps.
Basically, it's two improved 741 opamps in an 8 pin package.
It will make a nice preamp and tone control section for a mono practice amp.
Larry |
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| jovial_cynic |
| quote: | Originally posted by Lsharptec1
jovial_cynic,
It will make a nice preamp and tone control section for a mono practice amp.
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Ah, interesting. I've never used a pre-amp before, so I'm not completely certain how it shapes the sound. Like I said - I've build the LM386-based Little Gem, and it did what I wanted it to do. You are suggesting that a KA4558-based pre-amp to go into the Little Gem amp would be an improvement?
Do you suppose a 9v could power both of them, or am I going to need to use a 9v for each of them? |
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| Lsharptec1 |
jovial_cynic,
Here is a link for the spec sheet on the KA4558.
http://www.fairchildsemi.com/pf/KA/KA4558.html
The spec sheet does not show practical schematics for a preamp, but you can find those all over the web. Just do a search for
"dual opamp audio preamp".
You can get away with using a single 9V battery for both devices, but be advised that battery life will be shorter.
Good luck.
Larry |
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