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SSLV1.1 builds & fairy tales
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Old 6th December 2017, 09:25 AM   #4031
vitalica is offline vitalica  Europe
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Yes, it's Sonny's 4490 DAC + preamp, which is very-very good
With him I want to use a Renderer (NMR media renderer interface - electronic, engineering and consulting , which will use a Reflektor-D (3.3V).
Another D-Reflector-D has DAC (5.5V)
An SSLV for I / V (- | + 15V)
An SSLV for the preamp (- \ + 15V)

Last edited by vitalica; 6th December 2017 at 09:33 AM.
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Old 17th December 2017, 06:31 PM   #4032
tmas is offline tmas  United States
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Default Merlin BAM Power Supply

I have Merlin BAM (Bass Augmentation Module) that I am considering powering with 2 sets of SSLVV1.1's that I have on hand. The circuit is a very simple filter circuit utilizing 1 AD744JN op-amp per channel. The unit is currently powered by either 4X 9V Nimh batteries or a wall wart supply both feeding typical 7815 type regulators with electrolytic filter caps at the output.

The circuit current draw @+/-15Vdc is very low, Spec for 1xAD744 is 3.5ma Typical and 5.0ma maximum. I would be using 4 separate SSLV1.1'sX 2 set for +/-15Vdc for the left and right channels.

1) Would this be an appropriate use of the SSLV1.1 considering the very low current demand of the AD744's?

2) If so what would be the recommended target constant current for Q101 with an expected current load of 3.5-5.0mA?

3) What size and output voltage transformer would be best? I was considering 18Vac secondary on the transformer with hopes of approximately 25Vdc at the output of the filter cap C105.

Last edited by tmas; 17th December 2017 at 06:42 PM.
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Old 17th December 2017, 09:26 PM   #4033
Salas is offline Salas  Greece
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SSLV1.1 builds & fairy tales
1) Yes. The DCB1 buffer's signal circuitry draws very little for instance and sounds excellent on its shunt regs.

2) 100-150mA (chunks of spare current burned does good to such regs)

3) 18 or 20VAC 25VA
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Old 17th December 2017, 09:47 PM   #4034
Salas is offline Salas  Greece
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Antek AN-0220 for example is just $11 for 25VA and has two separate 20VAC secondary outputs to can feed one SSLV polarity each. Since those regs have own rectification stages they will not share a middle tap and a single bridge, they use the better two bridges & two isolated secondary outputs configuration.
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Old 18th December 2017, 04:01 AM   #4035
tmas is offline tmas  United States
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Thanks for the speedy reply Salas!

What do you estimate the dcV will be at the C105 filter cap using a 20Vac transformer such as the Antek AN-0220?
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Old 18th December 2017, 11:21 AM   #4036
Salas is offline Salas  Greece
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27-30V DC depending on mains voltage which is usually healthier than nominal. But at 100mA CCS its 1.5W dissipation only for the 9610 Mosfet and 15V across makes its internal capacitance lower. So its not an unbearable or bad thing to have some extra input voltage in this situation.
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Old 18th December 2017, 04:14 PM   #4037
tmas is offline tmas  United States
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Thank you Salas. Can you make recommendations for the brand of capacitors to use in position C105, C101 and C103? I know this a subjective area but wondering if there is any type/brand that has been shown to be sonically beneficial? Do not mind spending extra on better sonic performance if like Mundorf SGO and such if there is a sonic benefit. The Merlin VSM speakers I am using are very high resolution.
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Old 18th December 2017, 10:33 PM   #4038
Salas is offline Salas  Greece
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For your voltage levels:

Mundorf Mlytic AG 6800uF/40V for C105
Nichicon KZ 220uF 25V for C101
Nichicon KZ 47uF 25V for C103 (see paragraph #4 in the guide)
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Old 18th December 2017, 10:49 PM   #4039
Salas is offline Salas  Greece
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Also choose high quality soft recovery rectification diodes for low EMI creation like LQA06T300 or MSRF860G
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Old 19th December 2017, 02:43 AM   #4040
tmas is offline tmas  United States
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Thanks again so much Salas! What are your thoughts on a flat pack transformer like this one.

LP-40-600 Signal Transformer | Transformers | DigiKey

Verses a straight up torroidal like the Antek AN-0220 that you had mentioned previously? I have seen in other discussion on the board that some prefer the flat packs to the torroid. Your thoughts are greatly appreciated.
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