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Old 28th August 2005, 11:22 AM   #11
Bgt is offline Bgt  Netherlands
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BTW, the 5 Volts comes from a 78SR105HC 3 legged SMPS IC.
Saves add. wires, mess and efficiency.
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Old 28th August 2005, 05:28 PM   #12
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Nice job Bgt, I like the the trafo. Its much more space friendly than a toroid.

Where did you get case the lovely little chassis?
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Old 28th August 2005, 06:37 PM   #13
Bgt is offline Bgt  Netherlands
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Quote:
Originally posted by theAnonymous1
Nice job Bgt, I like the the trafo. Its much more space friendly than a toroid.

Where did you get case the lovely little chassis?
Audiokit

Its the GX243

And the weight....light like a heavy feather!!!
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Old 19th August 2006, 04:34 PM   #14
Bgt is offline Bgt  Netherlands
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ok, redid the layout for better crosstalk/soundstage. Hiss is so minimal that with 92db eff. speakers it is unhearable. Or you have to put your ear on the speaker. If you do this you'll hear a tone and some hiss.

Click the image to open in full size.
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Old 23rd August 2006, 12:12 AM   #15
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Hi Bert,

some question about the sound and comparison with UCD180 (I too have TA2022 in AMP5 and UCD180AD)

In my system UCD sounds higher than AMP5 and is less noisy (that doesn't mean AMP5 is noisy). But overall sound is far better in AMP5 .

So, I suspect that my Amp5 has something less than your AMP1b or your UCD has something less than mine.

With UCD I have the SupplyHG from Hypex (200!) While you have smd components on AMP1 and better caps, and me trough hole and standard caps. I have Fostex FE206E 96db SPL.

What have you that is not standard from 41Hz? I'm curious about your transformer (how many volts DC?) , the input caps (you wrote 22uF, maybe 0,22uF?), and that cap at the PS input.

Ciao

Thomas
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Old 23rd August 2006, 04:18 PM   #16
Bgt is offline Bgt  Netherlands
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Quote:
Originally posted by thomaseliot
What have you that is not standard from 41Hz? I'm curious about your transformer (how many volts DC?) , the input caps (you wrote 22uF, maybe 0,22uF?), and that cap at the PS input.
Hi Thomas,

Input caps are 22uF.
The orange cap on the psu line =10uF/63V only connected to 1 line+ and to 0V.
The booster cap. on the pcb became 1000uf/16v, panasonic low esr.
+and_ line on the pcb became 680uF/35V ultra low esr types, Rubycon.
psu lines are 31V DC each at idling. Halogen tranf. is 150VA/40khz.

Sound is impressive for this tiny amp. No bass or treble missing here.
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Old 23rd August 2006, 05:32 PM   #17
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Quote:
Originally posted by Bgt


Hi Thomas,

Sound is impressive for this tiny amp. No bass or treble missing here.
Hi Bert,

I know . You have 30.000 uF in the PS, too. I'm interested to your transformer: is it standard? I only found +12V halogen trasf. Is it stabilized?

Ciao

Thomas
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Old 23rd August 2006, 08:49 PM   #18
Bgt is offline Bgt  Netherlands
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Quote:
Originally posted by thomaseliot


Hi Bert,

I know . You have 30.000 uF in the PS, too. I'm interested to your transformer: is it standard? I only found +12V halogen trasf. Is it stabilized?

Ciao

Thomas
It is a rewound transformer inside. Will try to find the pic.
It is not stabilized. It has a 50Hz output and the 50hz cycle is made from a 40khz sq. wave.
Click the image to open in full size.

Click the image to open in full size.
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Old 23rd August 2006, 10:38 PM   #19
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Quote:
Originally posted by Bgt


It is a rewound transformer inside. Will try to find the pic.
It is not stabilized. It has a 50Hz output and the 50hz cycle is made from a 40khz sq. wave.
Click the image to open in full size.

Click the image to open in full size.
Hi Bert,

It is a switching circuit! And it costs 13 ! You made a smps. I've heard that Tripath chips sound better with smps.

Is it something doable what you made to original Conrad electronic transformer?

I think many people would be interested

Ciao

Thomas
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Old 24th August 2006, 12:53 AM   #20
rt7085 is offline rt7085  United States
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Default Tone

Somewhere you said that there was a tone in the noise. I bet ya that is because the switching frequency of the supply is not synchronized to the switching frequency of the amplifier. Perhaps you should somehow sync it up, if possible. It is most likely a beat frequency.
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