The weather has now cooled down to 21°C ambient temperature. I measure with my kitchen thermometer 65°C at the heat sink at the center of the THF-51S. With the infrared thermometer I measure 62°C. On the mounting side I measure around 51°C where the THF-51S is mounted. I can touch the heat sinks for 5s. For other builders I recommend to use the larger heat sinks.
I am currently listening to the amps with different speakers, pre-amps, and DACs. For the different preamps I use the 2022 Front End as a fixed gain.
I am currently listening to the amps with different speakers, pre-amps, and DACs. For the different preamps I use the 2022 Front End as a fixed gain.
i will try to build one these THF51S Follower in the following month , it seems to be difficult to build a stereo amp with both the linear power supply and the big 193V choke i have . so is there any external SMPS to use ? is one 24V 5A meenwhell per rail will be ok ? running at 2.6A ?
ha merde ! in Spice the 24V 2.6 A gives a nice 2 order and 3 order distribution and no needs of negative bias but it 's just sims 😉
If you have the heat sink capacity, go with 36 to 40V, and 2.5 to 3.0A. More power is always good.🤓
You will most likely need bias voltage adjustment because the Tokins are all over the place. There is no guarantee that the choke DCR will give you the Vgs to suit your Tokins, unless your Tokins are tested and selected to match your exact requirements.
The Sony VFET in your last schematic will need its source resistor adjusted to suit the current that seek too.
You will most likely need bias voltage adjustment because the Tokins are all over the place. There is no guarantee that the choke DCR will give you the Vgs to suit your Tokins, unless your Tokins are tested and selected to match your exact requirements.
The Sony VFET in your last schematic will need its source resistor adjusted to suit the current that seek too.
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Thread 'A single ended bright amplfier'
https://www.diyaudio.com/community/threads/a-single-ended-bright-amplfier.375187/.
Another choke loaded idea
https://www.diyaudio.com/community/threads/a-single-ended-bright-amplfier.375187/.
Another choke loaded idea
found this for 45V , seems good for the target ? https://www.audiophonics.fr/en/smps...ng-power-supply-module-400w-2x46v-p-4681.html
45V may be a bit high. I have not tried that voltage for choke loading so I have no idea what would be a good drain current for that voltage.
For sure you need to decide how much heat dissipation you can tolerate, or what heat sinking you would like to use.
You may want to prototype one channel and try and test operating points.
The chosen operating point/power dissipation and the heating sink capacity need to compatible.
Are you planning on monoblocks or a stereo amplifier? That will affect your choice of power supply capacity. For Class A amplifiers the power supply should be rated for at least two times the current draw.
For sure you need to decide how much heat dissipation you can tolerate, or what heat sinking you would like to use.
You may want to prototype one channel and try and test operating points.
The chosen operating point/power dissipation and the heating sink capacity need to compatible.
Are you planning on monoblocks or a stereo amplifier? That will affect your choice of power supply capacity. For Class A amplifiers the power supply should be rated for at least two times the current draw.
My tip is to try three things:
- Align the power amplifiers so that you can look through the "holes" of the trafos from your listening position: it goes through the electromagnetic fields of the transformers. These are enormous, hazardous to health, and pass through the walls (neighbors). Now you are sitting in the lowest EMF.
- connect the double mono psus. And listen.
- Move the loudspeakers together once to zero distance. Listen. Move them 10 cm apart, listen. Move them further apart, listen. And keep doing this until the sound image tears apart. Then move them together again until they play together: most "stereo signals" are mono (present on both channels). Since loudspeakers have different imaging sizes and shapes, you can determine the optimum set-up in this way. It will be that your loudspeakers will be less than one meter apart (center-center), so that width, depth, height, coherence, contour, colors... interact and become round.
Ben Mah - Could you send me the Gerber files for this project? Just planning ahead. Many thanks!
Good evening Ben Mah, a little question 'if we use the SIT in common source mode'what is the gain of this montage?
In thanking you.
Best wishes to all of you.
In thanking you.
Best wishes to all of you.
Translator error sorry ,I rephrase my question What gain in dB of the common source mount?
Thank you.
Thank you.