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Chip Amps Amplifiers based on integrated circuits

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Old 10th March 2008, 05:47 PM   #11
AndrewT is offline AndrewT  Scotland
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sounds like there is a resistor missing at the input.
I wonder if there is anything else missing?
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Old 10th March 2008, 06:02 PM   #12
simsim is offline simsim  British Indian Ocean Territory
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Well, knowledge on my part is missing of course :-) , but apart from that there's only 4 components in the whole 1558q amp not counting the chip. There is no resistor in the datasheet circuit for the BLT. I'm pretty happy with it now, it was my first project. Only thing I notice is that the speakers in the schematic says 4 ohm and mine are 8.

I also finished my lm1875 amp and I'm looking for a nice box to put it in.
Thanks again.
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Old 10th March 2008, 07:04 PM   #13
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by simsim
there's only 4 components in the whole 1558q amp not counting the chip. There is no resistor in the datasheet circuit for the BLT.
then some components are certainly missing.
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Old 10th March 2008, 07:49 PM   #14
simsim is offline simsim  British Indian Ocean Territory
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I realise now when I look at the picture that I always assumed the resistors drawn inside the chip were illustrations of its internal workings, not external components to be added. It's very unclear if that's what they mean.

This is the circuit I built:

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