DD new amp modules:

[hydrovac]

Hi all,
Got a pair of new version power amp modules from Aniket after a long wait... in spite being high power output amp, the board size really is compact owing to mostly SMD components and no onboard PSU section.
Aniket sent these without soldering the output devices as per my request and i need to mount them on the enclosure heat sink i already have and bias them.

The modules:


The enclosure with large heat sink:






The trafo 50-0-50 @ 12amp and other auxillary voltages:


The proposed layout:




will update progress of the build... stay tuned.
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[flat_listener]

Nice and compact modules... pl share specs of the amp, overall appears to be a serious build... looking forward to it.

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[hydrovac]

Build progress got delayed as i decided to go for mono blocks instead of stereo.... procured new enclosures, separate transformers, PSU boards and other inputs.

PSU boards (also from DD) populated:





Mono Block cases: internal (220W x 300D x 100H)











Amp module mounted on heat sink:






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[hydrovac]

Nice and compact modules... pl share specs of the amp, overall appears to be a serious build... looking forward to it.

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Specifications shared by Aniket.

220W @8ohms
400W @4ohms
THD : 0.006 % at 100W into 8ohms, 20Hz-20kHz, < 0.05 % at rated power.
Sensitivity : 1.2V rms for rated power
Input impedance : 33k
SNR : 108dB
Frequency response : 6-50000Hz (-3dB)

Above at 70V DC rails

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[CKumar]

Nice build, please keep sharing the progress with pictures
Subscribed the thread.

 

[CKumar]

Which liner power supply you have, @hydrovac ?
Please share source and specifications.
Thanks

 

[hydrovac]

Which liner power supply you have, @hydrovac ?
Please share source and specifications.
Thanks

I am using a simple unregulated power supply board sourced from Aniket... a toroidal transformer, bridge rectifier and 4x15000uf rail capacitors per channel.



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[surfatwork]

Are you going to put any shielding around that transformer corner?

 

[hydrovac]

Are you going to put any shielding around that transformer corner?

At present, no...
certainly will consider if there is any interference.

All the parts in place, need to install a mains power switch and solder the output devices... hook up wiring next.






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[amrutmhatre90]

From where did you source the cabinets? Everything is top notch

 

[kbhuvi]

Nice work sir

Btw, where did you buy the chassis and heatsinks

Regards

 

[hydrovac]

Thanks,
Enclosures designed and fabricated by Beginner_N ((Nishant)
Heat sink from Himalaya.

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[spirovious]

I am using a simple unregulated power supply board sourced from Aniket... a toroidal transformer, bridge rectifier and 4x15000uf rail capacitors per channel.

View attachment 81331

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Any reason not using a regulated PS? Does it helps to draw a good dynamic power? Any drawbacks?

 

[adas]

Any reason not using a regulated PS? Does it helps to draw a good dynamic power? Any drawbacks?

Regulation causes power loss substantially , your psu will dissipate more power than what the amp will because in a linear regulated power supply the extra voltage that is being regulated or reduce to a constant value is turned into heat. Also the need of a regulated psu comes when the PSRR of the amplifier is bad DD modules will have a substantial amount of PSRR and will not need a regulated psu.
Yes regulated PsU also kills dynamics because it reduces the voltage to a constant level and and amps output power is also reduced. It's a rather complex subject an independent description is a tad bit difficult...


Regards
Aniket Das

 

[CKumar]

Regulation causes power loss substantially , your psu will dissipate more power than what the amp will because in a linear regulated power supply the extra voltage that is being regulated or reduce to a constant value is turned into heat. Also the need of a regulated psu comes when the PSRR of the amplifier is bad DD modules will have a substantial amount of PSRR and will not need a regulated psu.
Yes regulated PsU also kills dynamics because it reduces the voltage to a constant level and and amps output power is also reduced. It's a rather complex subject an independent description is a tad bit difficult...


Regards
Aniket Das

@adas sir, I am not sure about sound aspects (resolution/dynamics) of regulated power supply, but since unregulated power supply output voltage varies with change in input voltage , current and temp , will this not reduce life, performance and reliability of electronic components?

 

[adas]

@adas sir, I am not sure about sound aspects (resolution/dynamics) of regulated power supply, but since unregulated power supply output voltage varies with change in input voltage , current and temp , will this not reduce life, performance and reliability of electronic components?

Yes you are correct that the voltage does vary with with line voltage, that why equipments are designed to work within a voltage range mostly +- 10% of 230V i.e 207 to 253VAC and the components needs to be specified accordingly. Where as we design our products for 180- 264V operation and the newer range of products will come with Over voltage and undervoltage protection as well.





Regards
Aniket Das

 

[hydrovac]

Any reason not using a regulated PS? Does it helps to draw a good dynamic power? Any drawbacks?

IMHO your point above makes a simplistic comparison difficult. I find that a "simple" linear PSU consisting of a hulk transformer + bridge rectifier + adequate smoothing capacitors will do... my stance is that these resources are better spent on building a well designed powerful amp which will have better performance.

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[hydrovac]

Build slowly inching forward... checked the PSU voltages prior to connecting the amp module... supposed to get 70VDC, reading low owing to 210V @ mains because of a snag in servo stabilizer.



For speaker protect


Did internal wiring... need to power up the amp and set bias.








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