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Old 1st July 2014, 03:47 PM   #1161
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I still have some boards left from the last groupsbuy
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Old 1st July 2014, 05:34 PM   #1162
ro9397 is offline ro9397  United States
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Quote:
Originally Posted by meanman1964 View Post
I still have some boards left from the last groupsbuy
Thanks.

Price?
Mono/stereo?
Boards stuffed/empty?
If empty: Estimated parts cost for both channels?

Does stuffed board require only transformer or complete PS?
If transformer only: specs?
If complete PS: Voltage range, minimum wattage?

I prefer SMPS for simplicity and cost savings.
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Old 1st July 2014, 11:55 PM   #1163
AKSA is offline AKSA  Australia
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Hi James,
As you know this is a DIY freebie for the forum almost three years back now and Meanman, Patrick, offers these empty pcb for DIYers who are happy to build up the full amp.
If you built the stereo FetZilla, you will pay parts (USD) prices around $300 including two 160VA toroids. There is a comprehensive documentation set at the 'Fetzilla Build Documentation' thread in this Aspen forum at the first post of the first page.
Just here: Fetzilla Build Documentation
While the pcb is easy to make, it is not easy; there are a couple of smd semiconductors to fit, but not too small.
The PS is dual; that is, there is a independent rectifier block and filter caps on EACH rail. Thus, you need only to connect the two 160VA 2x25Vac transformer secondaries wires; DC conversion is on the pcb. An smps is fine, but some say that there are considerable differences of sound quality between difference suppliers; the hypex smps is the best but will cost MORE money than the onboard linear supply.
The rails are 36V, and the output is around 50W into 8R. You will get around 75W into 4R. The amp will drive electrostatic speakers very well.

Cheers,

Hugh
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Last edited by AKSA; 2nd July 2014 at 12:01 AM.
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Old 2nd July 2014, 01:13 AM   #1164
ro9397 is offline ro9397  United States
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Thanks, Hugh.

25W@16R SS is too close to the gray zone...I did not need too much of a push to lean back toward the AKSA 80, which I presume makes 40W @ 16R, only 1 dB less than the known quantity of 50W into the same load.
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Old 2nd July 2014, 02:05 AM   #1165
syklab is offline syklab  Hong Kong
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Hi,
Can a pair of the fetzilla be wired to a single transformer or SMPS ? Any dumming issue ?

Thanks
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Old 2nd July 2014, 06:16 AM   #1166
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Quote:
Originally Posted by syklab View Post
Hi,
Can a pair of the fetzilla be wired to a single transformer or SMPS ? Any dumming issue ?

Thanks
No problem
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Old 2nd July 2014, 08:13 AM   #1167
AKSA is offline AKSA  Australia
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Yes, Syklab, but there is ONE significant issue.

If you use ONE transformer for BOTH channels, you need:

1. Two secondary windings, EACH of two wires, four (4) wires in total
2. ONE secondary, say #1 secondary, must be connected identically on the modules to the positive supply of L channel, and the same wires, paralleled, to the positive supply of the R channel.
3. THE OTHER secondary, say #2 secondary, must be connected identical on the modules to the negative supply of the L channel, and the same wires, paralleled, to the negative positive of the R channel.

If you do this wrong, you will blow up one of the rectifiers on each module, and a pair of the 0.15R power supply resistors under the pcb.

BTW, the single toroid you use for both channel should be rated to 300VA.

The idea of using two 160VA toroids is to build an amp with completely independent power supplies left and right. This is dual monobloc design, and it ensures that there is no channel crosstalk and a slightly improved depth of image.

Cheers,

Hugh
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Last edited by AKSA; 2nd July 2014 at 08:49 AM.
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Old 2nd July 2014, 08:29 AM   #1168
syklab is offline syklab  Hong Kong
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Hi Hugh,
Totally understood, Just that I bought one 300VA 2x25VAC transformer instead of 2 x 160VA 2x25VAC. May have to buy a new pair for that.

Thanks
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