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Old 31st December 2012, 01:23 AM   #121
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The Superteddyreg
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File Type: jpg SuperTeddyReg.JPG (52.5 KB, 531 views)
File Type: jpg AC_TranX.jpg (50.8 KB, 520 views)
File Type: jpg Impedance.jpg (56.4 KB, 483 views)
File Type: jpg Out_noise.jpg (57.1 KB, 468 views)
File Type: jpg noise_ratio.jpg (56.8 KB, 446 views)
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Old 31st December 2012, 01:25 AM   #122
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The Salas Shunt
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File Type: jpg SalasShunt.JPG (46.0 KB, 171 views)
File Type: jpg AC_TranX.jpg (51.1 KB, 160 views)
File Type: jpg Impedance.jpg (64.9 KB, 110 views)
File Type: jpg Out_noise.jpg (56.3 KB, 108 views)
File Type: jpg noise_ratio.jpg (61.1 KB, 83 views)
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Old 31st December 2012, 01:26 AM   #123
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The K-Multiplier
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File Type: jpg K_Multiplier.JPG (27.0 KB, 196 views)
File Type: jpg AC_TranX.jpg (53.1 KB, 182 views)
File Type: jpg Impedance.jpg (64.8 KB, 81 views)
File Type: jpg Out_noise.jpg (56.9 KB, 94 views)
File Type: jpg noise_ratio.jpg (55.9 KB, 85 views)
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Old 31st December 2012, 01:35 AM   #124
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Default Performance test

I got PCBs for SuperTeddyReg and Salas Shunt, so I can build them. I don't know if K-Multiplier PCB is available, anyway I'll build it myself.
When all regulators will be ready, TWRPS included, I'll go to a professional lab to test their real performance.
All regulators will be set to 6VDC/700mA.
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Old 31st December 2012, 02:54 PM   #125
jcarr is offline jcarr  United States
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With the exception of C1 being connected to ground, my impression has been that the K-Multiplier is supposed to be floating. I haven't simulated your circuit, but certainly my graphs (of the floating K-Multiplier) don't look like your graphs.

I will add that you can improve the floating K-Multiplier's input rejection performance at higher frequencies by splitting R2 into two resistors of 499 ohm each, and connecting another 820uF capacitor from the R2a/R2b junction to ground.

Also, the DDDac website has a 5V regulator solution that prioritizes input rejection performance and low noise, which you may find it worth looking at. The TIP122 pass device is chosen for high currents, and a smaller, less capacitive device could be chosen if lower currents are sufficient.

DDDAC 1794 NOS DAC - Non Oversampling DAC with PCM1794 - no digital filter - modular design DIY DAC for high resolution audio 192/24 192kHz 24bit

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Old 2nd January 2013, 02:48 PM   #126
TNT is offline TNT  Sweden
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Quote:
Originally Posted by andrea_mori View Post
I got PCBs for SuperTeddyReg and Salas Shunt, so I can build them. I don't know if K-Multiplier PCB is available, anyway I'll build it myself.
When all regulators will be ready, TWRPS included, I'll go to a professional lab to test their real performance.
All regulators will be set to 6VDC/700mA.
Subscribed!!!
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Old 22nd December 2013, 04:39 PM   #127
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Default Revision

After several tests op amp series regulator has been abandoned for a total discrete components design.
Actual schematic consists of a pre-regulation stage made by a sort of variable zener to set the voltage, followed by a capacitor multiplier. This stage acts as a pre-regulator and isolates the regulator from the load.
Follows the feedback regulation with a single bjt that drives the output devices in push-pull configuration.
For all the pass devices have been chosen the Sziklai pair mode, for its low output impedance. Also, the push-pull halves output impedance.
The values in the schematic are for a 4-9 volts 500mA regulator.
PCB can be used for both positive and negative regulator.
Also, the PCB can be used for a DC version (without rectification and filtering), cutting the PCB along the white line.
Attached: the actual schematic, some images of PCB and finished regulator, and the output impedance simulation.
Attached Images
File Type: jpg PCB.jpg (86.2 KB, 120 views)
File Type: jpg DC.jpg (77.5 KB, 120 views)
File Type: jpg AC.jpg (86.0 KB, 139 views)
File Type: jpg ZO.jpg (48.0 KB, 157 views)
Attached Files
File Type: pdf TWRPS-pp.pdf (22.4 KB, 131 views)
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Old 23rd June 2014, 10:14 AM   #128
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Ciao/Hi Andrea,

Do you sell the PCBs?

Grazie / Thanks

Felipe
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Old 23rd June 2014, 12:32 PM   #129
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Quote:
Originally Posted by merlin el mago View Post
Ciao/Hi Andrea,

Do you sell the PCBs?

Grazie / Thanks

Felipe
Hi Felipe,

I have some extra PCB of this regulator I could sell, I have only to remember what I paid for each PCB. Let me investigate then I tell you.
If you are interested, I'm developing and SMD version of this regulator. I believe it will be ready within a month. The regulator is the same of the TH version, only rectification and filtering are omitted.

Andrea
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Old 22nd July 2014, 07:34 PM   #130
cbdb is offline cbdb  Canada
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Can you load it with a pulsed current source to see how much it rings?
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