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Old 23rd May 2011, 02:02 PM   #41
dadod is offline dadod  Croatia
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Default Final schematic

Here is final schematic as I used during listening one channel.
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Old 24th May 2011, 10:28 AM   #42
AndrewT is offline AndrewT  Scotland
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is R24 = 47M or 4M7?
The schematic shows 4.7meg or 47meg
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Old 24th May 2011, 10:59 AM   #43
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4.7meg
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Old 24th May 2011, 12:38 PM   #44
AndrewT is offline AndrewT  Scotland
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then use the same style as the rest of the schematic for quoting component value.
4M7 cannot be confused for 47meg
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Old 24th May 2011, 02:11 PM   #45
dadod is offline dadod  Croatia
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Quote:
Originally Posted by AndrewT View Post
then use the same style as the rest of the schematic for quoting component value.
4M7 cannot be confused for 47meg
Sorry that is how LTspice is doing schematics.
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Old 30th May 2011, 12:38 PM   #46
dadod is offline dadod  Croatia
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Smile Listening in Stereo

Finilly I finished second channel and a listening in Stereo could start.
I was so eager to start with a listening that I adjusted the quiescent bias current only and started with listening.
I set the quiescent current to 120mA per pair(20mV/0.16ohm).
No thump at switch on and there was total silence from a loudspeakers even when I put my ear close to woofer or twitter.
The sound, for me is no easy to evaluate my own work, but it was all I expected.
Bass is very deep, punchy and fast(I use closed box for woofer).
Midle and high is crystal clear, violins so natural, female voice with no sibilance.
I used SACD, ordinary CD and XRCD during my whole day of the listening.
I would like someone else to make this amp and to have others opinion.
For interested I will add PCB pdf files, just ask.
Tomorow I will do some measuring tests with sinus, triangle and square wave on 8ohm and 4ohm, paralled to different capacitance.
No distortion tests as I do not have equipment yet, but how amp sounds must be close to the simulated results, and no stability problem at all.
attached are CLG, 1kHz and, 20kHz FFT simulated of course.
dado
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File Type: jpg DADO-TMC-T-2pairs-listening2.JPG (219.7 KB, 531 views)
File Type: jpg DADO-TMC-T-2pairs-listening3.JPG (162.6 KB, 457 views)
File Type: png DADO-TMC-T-2pairs-CLG.png (153.5 KB, 433 views)
File Type: png DADO-TMC-T-2pairs-FFT-1kHz.png (148.3 KB, 411 views)
File Type: png DADO-TMC-T-2pairs-FFT-20kHz.png (151.0 KB, 108 views)
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Old 31st May 2011, 11:54 AM   #47
dadod is offline dadod  Croatia
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Default Lab measurements

Some technical data:

power supply: 400VA trensformer, +-46V, 2x23000uF
power on 8ohm 105W before clipping
power on 4ohm 170w before clipping
gain 32dB with -3dB from 5Hz to 560kHz
input resistance cca. 33kohm

Here are some photos from test measurement.
dado
Attached Images
File Type: jpg power-test.JPG (242.4 KB, 148 views)
File Type: jpg sinus-20kHz.JPG (197.7 KB, 131 views)
File Type: jpg triangle-20kHz.JPG (201.1 KB, 68 views)
File Type: jpg square-10kHz_0C copy.jpg (147.5 KB, 118 views)
File Type: jpg square-10kHz_01uF copy.jpg (169.2 KB, 127 views)
File Type: jpg square-10kHz_022uF copy.jpg (147.1 KB, 124 views)
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Old 31st May 2011, 12:08 PM   #48
dadod is offline dadod  Croatia
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Default Transistor matching

Only transistor I did some kind of matching were Q2 with Q3 and Q5 with Q6 and I did hfe match only.
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Old 2nd June 2011, 08:50 AM   #49
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I noticed strange behavior durin simulation with 20Hz close to clipping.
The reson was in capacitance multipliers. I changed R26, R29 from 1kohm to 100ohm and R27, R28 from 33kohm to 10kohm and all was OK after that.
It looks that the capacitors connected to multiplying trensistors were loaded to slowly trough 1kohm. That manifested itself only at very low frequencies.
First diagram is with old multipliers.
dado
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File Type: png close to clipping-old-Cmult.png (155.5 KB, 130 views)
File Type: png close to clipping-new-Cmult.png (158.0 KB, 93 views)
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Old 30th June 2011, 03:43 PM   #50
dadod is offline dadod  Croatia
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A box skeleton finished and populated. Made from aluminum L profiles. Now I have to cover it with wood. This is now integrated amp with 3 inputs and I am making it for my dougther.
I like the sound more and more each time I am listening to it. It is pity no one whants to make this amp, I would like to hear ther opinions. It is simple and very stable.
dado
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