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Old 2nd July 2014, 02:29 PM   #1271
AndrewT is online now AndrewT  Scotland
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Janusz,
post1267 .doc
where is the schematic that shows the components coding/numbers?
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Old 2nd July 2014, 08:56 PM   #1272
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Quote:
Originally Posted by AndrewT View Post
Janusz,
post1267 .doc
where is the schematic that shows the components coding/numbers?
#1239
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Old 3rd July 2014, 12:24 AM   #1273
jdg123 is offline jdg123  United States
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kemicalx, you can assemble all you need by going to the DIYaudio store for the boards and casework then your favorite electronics site for the components from the BOM (or bill of materials). It's two-stop shopping instead of one; not bad at all!
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Old 3rd July 2014, 03:00 AM   #1274
janusz is offline janusz  Australia
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This is the upper part of the circuit. Values are just demonstration.

cheers,
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Old 3rd July 2014, 11:25 AM   #1275
AndrewT is online now AndrewT  Scotland
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The capacitor allows a different transient current limit, from the DC current limit.

A good IV protection system will allow all valid audio signals to pass into all valid audio loads.
If the IV system cannot meet that basic requirement, then it will be audible.

As a starter, look at what the limiting locus looks like when Vbe of the protection transistor is ~ 400mVbe, i.e. just turning on.
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Last edited by AndrewT; 3rd July 2014 at 11:27 AM.
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Old 3rd July 2014, 12:13 PM   #1276
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protection circuit installation you can see before and after
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File Type: jpg 100_2249.JPG (322.7 KB, 382 views)
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Old 3rd July 2014, 12:14 PM   #1277
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!!!!!!!!! pictures are not in correct sequence ............
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Old 14th September 2014, 09:05 AM   #1278
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Default Power board layout question


Which performs better with a center tap transformer?

1). This?
Click the image to open in full size.

2). Or, This?
Click the image to open in full size.

P.S.
Before I forget, I'd like to ask an additional question. Where is the most ideal location for the drainer/led section (and optional snubbers)?
A). As shown, or. . .
B). Drainer load put right after the R||D series element?
C). Drainer load put right before the R||D series element?
*As for audio quality, I might tend to guess C, because closest to bridge rectifier, but I'm not certain.
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File Type: gif PowerCRDC2.gif (43.1 KB, 242 views)
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Old 14th September 2014, 09:35 AM   #1279
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Personally, I would expect 1) to be preferred in your choices. All PCB traces have resistance proportional to their length (for a given width and thickness). Option 2) has additional 0V trace length in series with the 3300uF capacitors, and consequent series resistance, which would tend to slightly reduce their peak current smoothing ability.

As for the remainder of the circuit, it resembles a 3-stage pi-filter. I suppose the circuit could be simulated by inserting small equivalent resistance values in proportion to trace CSA & lengths.
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Old 14th September 2014, 12:16 PM   #1280
AJT is offline AJT  Philippines
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for me, tie all caps together for the positive and negative rails, and make them meet the center tap pad in one place....

what is the purpose of the resistor and the diode?
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