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Old 7th August 2007, 11:35 AM   #11
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Capacitor CI shown near the word "GND" on PCB is not shown in schematic anywhere ? or may be I missed it.

regards
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Old 7th August 2007, 12:36 PM   #12
AndrewT is offline AndrewT  Scotland
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Hi,
the PSU in post 5 is wrong.
It shows a dual rectifier arrangement feeding the positive and negative halves of the PSU. This side os OK.

The transformer is shown as centre tapped. This is wrong.
The four connections on the PCB MUST be connected to dual secondaries.
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Old 7th August 2007, 12:38 PM   #13
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by beetel
Capacitor CI shown near the word "GND" on PCB is not shown in schematic anywhere ? or may be I missed it.

regards
Hi Beetel,
look again and you will see that (Cia+Cib) are parallel to Ci.
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Old 8th August 2007, 10:58 AM   #14
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What is the value of Ci ?

thanks
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Old 8th August 2007, 12:10 PM   #15
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by beetel
What is the value of Ci ?
precise value hardly matters.
A low value film cap of about 1% of the electros is close enough.

Some say polypropylene is good here but they tend to be bulky and more expensive, but getting cheaper by the month.
Polyester is probably next best followed by Mylar (a lower quality version of ester film). PES are small and cheap.
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Old 8th August 2007, 02:50 PM   #16
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Thanks for reply Andrew

Quote:
A low value film cap of about 1% of the electros is close enough.
In the PCB file the Ci is shown as an electrolytic capacitor.

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Old 8th August 2007, 03:02 PM   #17
yangsmm is offline yangsmm  South Korea
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Default Thanks all of you!

Thanks all of you. I needed the schemetics of lm3886. I'd like to make audio amps using lm3886.^^ Thanks a lot.
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Old 8th August 2007, 06:03 PM   #18
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by beetel
In the PCB file the Ci is shown as an electrolytic capacitor.
that must be an oversight.
He appears to have pulled up the wrong symbol.
There is little advantage in adding another polarised electro in parallel to the back to back polarised electros.
He surely intended to show a low ESR, low inductance, low distortion, bypass across the electros. The bypass will hopefully handle all the mid and high frequencies. The electros will bring up the bass.
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Old 5th October 2007, 03:15 PM   #19
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tla-Audio has used two 2.7ohms /2w resistors in power supply and one 2.7 ohms/2w in amp circuit.

What type of resistors should be used here ?
Carbon film, wirewound, metal oxide, fusible or something else ......

thanks
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Old 22nd October 2008, 11:11 AM   #20
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I have just etched my first board using this design

Click the image to open in full size.

I will etch the second one soon.
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