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Old 15th March 2011, 09:44 AM   #751
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Hi dan,
I have also done this for a Kaneda amplifier. It is very hard to get the last glitches from the rectifier out, and the Kaneda is unforgiving.
For the Monstre a supply that works in a softer mode, a regulator that itself - you might say - is class A, works charms. That is the basis for my thinking. However, I have much more capacitance banks than you have, so the topology is quite different.

I used the LM338K like the data sheet suggests: with a 'solid tantal' capacitor at the output (professional solid tantal is not the drop-like form but a tubular form of a casing). This makes the regulator more relaxed than a series of 10.000 muF caps after the regulator.
albert
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Old 16th March 2011, 12:08 PM   #752
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Thats an interesting take on it albert, I lean to large capacitance over regulation if i can. I still have not tried a battery monstre.... one day...

-Dan
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Old 16th March 2011, 01:36 PM   #753
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In a local dump-shop they used to have 24 V airplane batteries, before I made up my mind they were sold out. It should be an easy venue with a compact (and safe) form.
24v F19 40H1C.jpg
As you can see here, it allows attaching a mass connection halfway the cells easily. This picture is for a real tangible aircraft, a larger 40 Ah type but small 8 Ah exist, that are good for continuous connection to the powersupply.

and how about this: a model aircraft battery of 2.800 mAh, why wouldn't that work? 11.1 V nominal would probably allow attaching to 12.5 volts power rails . . . For the money it's worth the try.
albert
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Old 24th March 2011, 01:42 PM   #754
jemraid is offline jemraid  United Kingdom
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Hello all,

I stumbled upon this thread whilst looking for Class A DIY amps. I have no technical knowledge, can recognise components and read a simple circuit diagram and turn that into a finished project. Have made a Gainclone and some years ago a monophonic synthesiser.

I would like to ask a couple of questions;
Will the amp work 4 Ohm 85 db Mark Audio CHP-70 speakers, I'm making a pair of Frugel Horn Mk3's.
And would I need a pre-amp, I use a CD player and Cassette Player.

Regards - Jim
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Old 24th March 2011, 04:13 PM   #755
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Hello Jim

85db is very low for these amplifier even in mid sized room.
You need min 88-90db to enjoy the music with these amp.
Yes you can drive direct with CD player these amp, I advise you take a look at the Hiraga Class A amplifier with your speakers! That has min.20W power.
I had 87db and I had sometimes problem to drive my speakers! Specially if you like classical music.

Greetings Gabor
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Old 24th March 2011, 07:09 PM   #756
jemraid is offline jemraid  United Kingdom
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Dear Gabor,

Thanks for your reply I;m pleased that it doesn't need a preamp.

I went to Toppsy's house to listen to the FH Mk3's he'd made, one pair with Fostex and the other with the MA CHP-70, I thought the MA speakers were much better than the Fostex ones. The amplifier in use was an 8 watt 300b and drove the speakers with no problem at all and with all sorts of music. The FH3's are single driver horns and presumably an easy load for an amplifier, though of course I am probably wrong about that :-)

I thought the Hiraga amp was the solid state version of the 300b and thats why I am keen to make one. I will have to find the circuit for the 20 watt Hiraga.

The CHP-70's are 18 watt, 4 ohm, 85 db 4" units

Regards - Jim
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Old 24th March 2011, 09:17 PM   #757
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Hello

Be aware many Fostex drivers are over 90db, some of them are very loud!
When you use 4PC 85db drivers that would be higher than 85db, that no longer 85db. Probably you can match the Le Monstre with your speaker.
I tried with 87db it was OK. But for every day use it would be better 89-90db speaker!

Greetings Gabor
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Old 26th March 2011, 09:30 PM   #758
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Default Le monstre with 4 Ohm speakers impedance

Hello ALL.

i would like to realize the Le Monstre amplifier with battery psu.

Anyone knows the output impedance of this amplifier?

Connecting it to a 4 Ohm impedance speakers, may i suppose to have more then 14 watts of power?

Can this amp drive 4 ohm impedance speakers?

Thanks to all and regards from Italy.

Maurizio.
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Old 27th March 2011, 10:25 AM   #759
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Hi Maurizio, see my post #713, where I mentioned some measurements.

Output = 2,45 volt RMS, Without a load.
Output = 2,05 V RMS, with a 8 ohms load.
Impedance is about 0,75 ohms (the 0,3 amp gives a 0,4 v drop..)

(I didn't measure 4 ohms). At 4 ohms the max output therefore is not 14 watts.
The Monstre works well in the range of 4 to 20 ohms.
The amplifier can drive 4 ohms but this must be a higher efficiency one to get you above 100 db in your room ...
albert
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Old 27th March 2011, 01:13 PM   #760
lineup is offline lineup  Sweden
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I have setup my Le Monstre for spice test.
I use common transistors and MJL3281 MJL1302 for output.

3 changes:
- Potentiometer 50 Ohm to increase current in JFETs
- R1 and R12 = 270 Ohm for 0.8A bias in output

Some results:
THD 0.100% = 3 Watt in 8 Ohm
THD 0.203% = 5.87 Watt

Le Monstre works best at 0.8A bias.
Nothing to gain by increase.
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