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Old 27th March 2011, 12:46 PM   #761
lineup is offline lineup  Sweden
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It is fully possible to increase to +16/-16 supply.
This almost doubles the power output.
Bias should be increased to 1.0 Ampere

Like here. See image.
THD 0.200% 10.75 Watt +16/-16 Volt supply
compared to 5.87 Watt with +12/-12 supply
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File Type: png monster_16v.png (17.8 KB, 1014 views)
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Old 27th March 2011, 12:57 PM   #762
jemraid is offline jemraid  United Kingdom
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Dear Lineup,

Thank you so much for all your hard work, I am one of the people who will benefit from your patient work with the amplifier.

I will be driving a pair of Mark Audio 4 ohm CHP-70's in Frugel Horn Mk3's and the 16V is just what I need.

I am very grateful to you.

Warmest wishes - Jim Read
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Old 27th March 2011, 01:10 PM   #763
lineup is offline lineup  Sweden
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Yes, there is no change except to choose R1, R12 for ~1 A in output stage.
For 4 Ohm you may need a bit more than 1 A. Maybe 1.25-1.50A

It is easy to change supply voltage in Le Monstre to 2x16 Volt
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Old 27th March 2011, 01:59 PM   #764
lineup is offline lineup  Sweden
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I made a 16 Volt 4 Ohm version.

See diagram.
The components in red are which adjusted.
- Added two extra 1 Ohm resistors
- Adjusted R1 and R12 for 1.5 Ampere bias.
4 Ohm speakers need more current than 8 Ohm

The output result is 14.64 Watt into 4 Ohm
at THD 0.300%
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File Type: png monster_16v_4ohm.png (18.6 KB, 979 views)
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Old 27th March 2011, 03:50 PM   #765
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Default Hiraga with 4 ohm spearkers..

Hello Lineup..

As i want to use ti with batteries..

Wich power is capable to handle with 4 ohm loads and +12 main supply?

Thanks.

Maurizio.
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Old 27th March 2011, 05:06 PM   #766
jarinal is offline jarinal  Norway
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Good evening gentlemen.

I Thought I'd share a few pictures of my own build.
Click the image to open in full size.
http://bildr.no/view/851837
Here are the intestines of my monster. The power supply is as simple as it gets. Just two 220 000uF capacitors, a rectifier i found on the dump and a 300VA toroid. I'm currently working on making the transformer shield fit. The ground routes got a bit messy while trying to reduce the power supply noise, but it's nearly dead silent now.

Click the image to open in full size.
http://bildr.no/view/851836
The case is a bigger version of osscar's. The cooling is a bit over dimensioned, as the amplifier rarely gets hotter than 30-40 Celsius with a bias of 700mA

The main reason for the big case are the two capacitors.

I must say I'm impressed by the sound. The bass is so unbelievably tight. My NAD T744 doesn't have nearly as good sound.

Last edited by jarinal; 27th March 2011 at 05:25 PM. Reason: Buggy links
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Old 28th March 2011, 06:37 AM   #767
lineup is offline lineup  Sweden
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I have tweaked the 16 Volt supply foor 4 Ohm further..
Here is my final try.

Changes from original Hiraga is in red.
- 2SC2911/2SA1209 are most suitable.
- Also added two 100 Ohm resistors for lower distortion.
- Along with those extra 1 Ohm resistors in output.
- Two 22p caps can be added for compensation.
- Bias is 1.87A. This means large heatsink

As can be seen we can get something like 21 Watt into 4 Ohm
This is not bad compared to original 5-6 Watt into 8 Ohm.
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File Type: png monster_16v_4ohm_final.png (19.5 KB, 866 views)
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Old 28th March 2011, 06:50 AM   #768
lineup is offline lineup  Sweden
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I forgot to say that to get like 2 x 16 VDC
we need one transformer 2x12VAC and rectifier diodes/bridge
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Old 28th March 2011, 09:01 AM   #769
jemraid is offline jemraid  United Kingdom
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Dear Lineup,

That is absolutely wonderful thank you very much indeed.

I think this will become the solid state amplifier for the Mark Audio range of speakers.

I have nearly finished my FH3's, the Hiraga will be my next project. It will take me a couple of months to get it all together but as soon as I do I will report straight back here.

My warmest wishes to you - Jim
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Old 28th March 2011, 10:57 AM   #770
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Hi, lineup,
May I suggest a larger transformer, as 12 V will get 15,7 no current (16,9-0,6-0,6) but any load will drop that significantly; with CRC filtering I suggest at least 2x16 volt (measured across a 5 ohm load). That's how I do it.

I like your developments of the original schema very much. The new drivers have a very very low Cob. The 'old' output pairs are a bit weak. Would be interested as to hear the effect on the sound stage.
albert
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