Keantoken's CFP cap multiplier

I use another KM board for my J-Mo Mk II headphone amplifier.
Excellent results!
About 2V drop and it is feeding Salas BIB. Very clean power!
 

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Dear keantoken,
you have mentioned a three transistor design with less output impedance, I am very interesting in it. I have probed your design with BD140&BC337 and it works fine without parasitic oscillation, but if I want to have real low output impedance, it needs a lot of current.
Aim of circuit is the analog supply of a WM dac, it sounds better with very low impedance power supply. Have you any measurement data about noise increasing / decreasing? What is your opinion about this?
 
KMultiplier for Preamp Power Supply

Hi Kean,

I would like to replace my PS Audio Preamp "Power Supply" with KMultiplier.

However I have some question :

1. Can I combine KMultiplier with LM-317 and LM-337 without effect to the
sound performance.

or possible to use trimmer in KMultiplier to adjust output voltage and
make same output voltage between positive section and negative section.

Please suggest your best solution.

Because my transformer 24 VAC, after rectifier and capacitor about 33 VDC.
Preamplifier need about 28 VDC.

2. Recommended Capacitor after output K-Multiplier.

3. What about snubber filter and bladder resistor.

Thank you for your help, I am beginner my question maybe funny.

Rgds,
Sun
 
Capacitors: I would use plain old Nichicon VR, because it is good and inexpensive. Many here prefer Panasonic FC for many of their projects so you may use that if you want.

Bleeder resistor: I would use a normal 6.8k after the KM for 28V.

Trimming: I suggest to increase R2 for the KM that has higher output voltage.

Snubber filter: What do you mean?

Your schematic will work. There should be at least one lytic near the output of the KM.
 
I don't know why you would use a 10R+10nF snubber after the KM, there will be no benefit.

Increase R2 only if you want to trim output slightly.

Chip regulators have very large output inductance which will resonate with electrolytics at their output. Some people say this results in bad sound. So it would make sense to try a KM after a chipreg to see if it is an improvement.
 
Dear Andrew,
I just look at internet and get an idea.
The circuit I copy paste from SupperTeddyReg.

Actually I am mechanical engineer, but funny my hobbies in electronic so my knowledge to limited in electronic.

As per tips of Mr. Kean I decide to use KM only without combine with SupperTeddy voltage regulator.

Thanks to your response of the schematic my knowledge add.

I you have any tips to add my knowledge you are wellcome.


Dear Kean,

I just to make sure if 10R+10nF snubber needed, since you are not recommended so I not use it.

May I series R2 (1K) with trimmer 2K.

Last quotestion.
I would like to build two positive regulator instead of positive regulator and negative regulator.

It is OK for KM with two positive regulator as per schematic below.

Rgds,
Sun
 

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Hi,

Just to let you know that 4 KM printed circuit boards (PCBs) have been sold. There are only two left. If you want one, please get in first before they are sold out.

I won't have these boards made any more because the batch I had was for 4 KMs used in my own system. All proceeds will go to Keantoken for his R&D work.

Regards,
Bill