Hi Samppaz,
Nope. It might have been less noisy (wide band) with only one 12V regulator - not that you have much gain. It just "looks" better to you, that's all.
You can easily try another supply to prove this. Use either a 78L12, or a low noise regulator. No need for the heavy load you put on it either.
-Chris
Nope. It might have been less noisy (wide band) with only one 12V regulator - not that you have much gain. It just "looks" better to you, that's all.
You can easily try another supply to prove this. Use either a 78L12, or a low noise regulator. No need for the heavy load you put on it either.
-Chris
Just seen ...
Finally an amplifier housing design not in the usual rectangular brick shape.
I like it.
My mini Quad amplifier
For information about this please see :
https://www.diyaudio.com/forums/sol...phile-approach-perfect-sound.html#post6718088
For information about this please see :
https://www.diyaudio.com/forums/sol...phile-approach-perfect-sound.html#post6718088
Attachments
Class A SE
Some measurements.
Have to say, that with my mono amplifier hooked up to big speakers left and right around tv, measurements wont tell nothing for what i have been experienced sound quality and loudness.
One speaker is 4ohm and 90db/w and inside is two 8" bass elements, one 6.5" mid element and one tweeter.
test have been made with 4Ohm resistor and cheap usb scope for pc.
Some measurements.
Have to say, that with my mono amplifier hooked up to big speakers left and right around tv, measurements wont tell nothing for what i have been experienced sound quality and loudness.
One speaker is 4ohm and 90db/w and inside is two 8" bass elements, one 6.5" mid element and one tweeter.
test have been made with 4Ohm resistor and cheap usb scope for pc.
Attachments
Thanks Mr. Curl, you made my day,..., no, my week!
I only listened to it a couple of hours but have a good feeling about it. Now even more!
System and amps used is: (you will recognize the amp schematic, it was not the intention in first place, but all kind of issues moved me in the direction to were I landed)
https://www.diyaudio.com/forums/solid-state/96192-post-solid-pics-683.html#post6288826
Blowtorch preamp experience
Holy s..t, is that coming out of my Sonus Faber bookshelves... the bass is really nice, it goes much furter then my PS-audio preamp. It looks like these are big floorstander speakers. Understand me well, it is not as if there is a big sub playing which add's to much bass, all is still nice in balance, hights, mid's, vocals, bass.
Wonder how the sound will change after powered on for several weeks. Many don't believe in burning-in, I experienced a rather big improvement wiht my amp's once powered on for about 200.300hours.
I've done a fast and easy mock-up on a piece of wood in combination with a 10k Pot.
Holy s..t, is that coming out of my Sonus Faber bookshelves... the bass is really nice, it goes much furter then my PS-audio preamp. It looks like these are big floorstander speakers. Understand me well, it is not as if there is a big sub playing which add's to much bass, all is still nice in balance, hights, mid's, vocals, bass.
Wonder how the sound will change after powered on for several weeks. Many don't believe in burning-in, I experienced a rather big improvement wiht my amp's once powered on for about 200.300hours.
I've done a fast and easy mock-up on a piece of wood in combination with a 10k Pot.
Attachments
OMG that's utterly horrendous - although the 100Hz waveform is the only one that's not obviously crippled, there's no FFT for it (nor are the axes labelled in the FFTs anyway). At a guess I'd estimate THD at 100Hz as ~1%, at 1kHz 10%, at 10kHz 40%
First observation you are trying to drive a FET gate directly from the soundcard - at higher frequencies a FET gate is going to look quite low impedance due to the large capacitance between gate and source and the Miller capacitance between gate and drain. Also this capacitance varies significantly with the drain current, which may account for the hyper-severe distortion at 1kHz and above, as this non-linear capacitance forms a divider with the output impedance of the sound card.
Well the bass isn't so bad.
Try something that will show up distortion better than solo electric guitar - vocals perhaps. I reckon cymbal crashes are going to be particularly nasty with that top end nastiness.
Can you switch back and forth with a known good amp?
Class A SE Sound Demo2
Here some more demo sound.
I think that full volume for YouTube and computer is overdriving my amplifier.
MP4 with only sound is full volume.
MP4 video is 2/3 full volume and rest for video is volume redused.
And i have mono sound output setting on for Windows so maybe it some times dont like add left and right channels together proberly.
Tidal with roon and there is ASIO and headroom -6 and summed left and right together -3db and Works great.
And now i have only one amplifier, so switch between two is not possible.
Here some more demo sound.
I think that full volume for YouTube and computer is overdriving my amplifier.
MP4 with only sound is full volume.
MP4 video is 2/3 full volume and rest for video is volume redused.
And i have mono sound output setting on for Windows so maybe it some times dont like add left and right channels together proberly.
Tidal with roon and there is ASIO and headroom -6 and summed left and right together -3db and Works great.
And now i have only one amplifier, so switch between two is not possible.
Pictures....
Hi Samu. Could you post more pictures of your amplifier, brighter clearer ones? I am interested in the way the connections are done and the internals.
Hi Samu. Could you post more pictures of your amplifier, brighter clearer ones? I am interested in the way the connections are done and the internals.
Here are inside Class A SE
95% Power wiring has made 2.5mm2 fine silicone covered wire.
5% has made 2.5mm2 regular wire.
Audio inputs for Back are parallel connected, and are RCA, 3.5mm and 6.5mm.
There it will trawel forward for shealded microfone cable to driver board where is Gate bias voltage and audio injection for it happens.
For driver board it continues shielded cable to mosfet and center is connected directly with solder Gate pin and ground shiel to negative for main Power side.
Front panel has switch to change between headphone output on front 6.5mm or banana plug output for rear to speakers.
95% Power wiring has made 2.5mm2 fine silicone covered wire.
5% has made 2.5mm2 regular wire.
Audio inputs for Back are parallel connected, and are RCA, 3.5mm and 6.5mm.
There it will trawel forward for shealded microfone cable to driver board where is Gate bias voltage and audio injection for it happens.
For driver board it continues shielded cable to mosfet and center is connected directly with solder Gate pin and ground shiel to negative for main Power side.
Front panel has switch to change between headphone output on front 6.5mm or banana plug output for rear to speakers.
