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Old 30th August 2012, 08:00 AM   #1
Walcen is offline Walcen  Australia
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Default little gem mk11

Hi everyone, I think this is my first post, not sure cause I frequent so many forums . Anyway I have a question regarding the little gem mk11practice amp from runoffgrove.com, I drew the circuit up in Eagle and then I lay the parts out as per the Pdf pcb layout that was supplied and the two don't seem to add up unless I swap the connections and grounding between terminals 2 and 3 on the 2 lm386 op amps.

Which is correct? the layout or the schismatic? I I ask because it seems a few people that have built this amp have had some problems, hence the reason I compared the two.

Thanks for any input.

regards to all,

Walt
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Last edited by Walcen; 30th August 2012 at 08:08 AM.
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Old 30th August 2012, 12:09 PM   #2
Bone is offline Bone  United Kingdom
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U1 is at the bottom on the schematic.
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Old 30th August 2012, 02:52 PM   #3
Walcen is offline Walcen  Australia
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Yep that works but then I also have to swap R3 and C5 around and I'm not sure how that'll go. Thanks for the reply.

regards

Walt
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Old 30th August 2012, 05:30 PM   #4
Bone is offline Bone  United Kingdom
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It doesnt matter which way round they are. They will work both ways. This is a Zobel network (Boucherot cell) to effectively make the speaker impedance resistive. Google it.
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Old 31st August 2012, 12:03 AM   #5
Walcen is offline Walcen  Australia
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Thanks mate, much appreciated.

regards

Walt
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