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Old 30th July 2009, 01:45 PM   #41
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thanks but there is no discernible difference on the pins (except a square pattern which should indicate the negative side).

Here are low quality (I am sorry) pics of the boards.

I have recently finetuned a method of achieving 2mils precision on routes and similar clearance. I print all my boards at home with a home made bromograph.

Th boards will be trimmed and fitted as shown in the casing in the pic.

The casing will be treated and spraypainted mat black. The power components casing will be in plexi painted to match. The plexi wil be of adequate thickness to ensure rigidity.

Click the image to open in full size.

Click the image to open in full size.

Quite a campaign in support of Quasi's design.
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Old 31st July 2009, 05:18 PM   #42
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just another question....

I understand I have enough capacitance but while I wait for the plexi to be delivered I was thinking of making another small board with some spares I have around.

I have different poliester caps (0.1uf and such), film mkt 1.5uf and several small electrolytic.

Since I have to wait does it make any sense to build a final filtering board with say 4 of each of these caps? I can easily make three boards with these capacitors. Would it degarde the sound quality? or enhance it?

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Old 1st August 2009, 10:29 AM   #43
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
you will need local decoupling on all the amplifier boards you assemble, that's Power-amp, pre-amp, opamp and buffer type amplifiers.

Keep them and buy more for your projects.
regards Andrew T.
Sent from my desktop computer using a keyboard
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Old 1st August 2009, 10:49 AM   #44
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As for volume control I was thinking of this: I still have space for 2 boards in the container. 6 of these circuits will control volume for the 6 amps. Is this a good idea?

Is anything needed between the output on the amplifier and the input on the volume cotnrol?

Sorry for the dumb questions but I am still learning.

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Old 23rd September 2011, 03:19 PM   #45
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Just wanted to close this thread with my results....Out of all the parts I have collected I have basically built 2 amplifiers. One is completed...

Click the image to open in full size.

Click the image to open in full size.

2x L20 chinese amplifiers (run of the mill ss amplifier)
2x500w toroidals
speaker protection circuit
NE5532 cheap preamplifier
15/9v separate toroidal transformer (not in picture)
150,000uf per channel worth of capacitors.

Voltage fed into the amp +/-45v loaded.

I am now building a 6 channel version with input selector, LCD preamp, 5.1 controls, remote and all the usual modules (DC protect, softstart...ecc )

Anyways my 2 cents of wisdom: if the project is too ambitous just split the BOM and build smaller amps.
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