Here the connections of my sda 400. If as you say, there is a HF filter at the input stage, how my smartphone captures it ?
In full size
An externally hosted image should be here but it was not working when we last tested it.
In full size
Well, some questions:
Package includes two small 10uF63V for Attenuator board.
These must be mounted, independent of the use aux voltage on this pcb . ( for all this advice also) very important .
You made the bridge, directly on the SDA pin input ? (at bottom pcb, between -IN and AGND ) ?
You need a "separator" as a shield between the toroid output and input boards. if you want to assemble in this small case also,In this case , you can review the length of the flat cable.
The Vhf input filter , protects the SDA .
Is known that these modules are not critical I think, of course requiring a minimum "criteria" for mounting, it's a D Class Amp.. 🙂
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Well, some questions:
Package includes two small 10uF63V for Attenuator board.
These must be mounted, independent of the use aux voltage on this pcb . ( for all this advice also) very important .
I didn't receive these capacitors but I can buy it. And where I have to put it, do you have some pictures witch explain ?
You made the bridge, directly on the SDA pin input ? (at bottom pcb, between -IN and AGND ) ?
Yes
You need a "separator" as a shield between the toroid output and input boards. if you want to assemble in this small case also,In this case , you can review the length of the flat cable.
Like this picture ?
The Vhf input filter , protects the SDA .
Is known that these modules are not critical I think, of course requiring a minimum "criteria" for mounting, it's a D Class Amp.. 🙂
Alps pot removed note
Hello,
These jmp to remove the pots.
The two caps 10uF63V has an importance in the attenuation noise "captured", right we use the flat cable. (create a loop around the layers of the signal).
I must say though, that these modules have no noise, and that the measure "thd vs. frequency", is not altered by the presence of the pots. this is a simple measurement, very sensitive to the variation of inductance in the signal path. but it is certainly possible to obtain an improvement of the sound.
regards
Hello,
These jmp to remove the pots.
The two caps 10uF63V has an importance in the attenuation noise "captured", right we use the flat cable. (create a loop around the layers of the signal).
I must say though, that these modules have no noise, and that the measure "thd vs. frequency", is not altered by the presence of the pots. this is a simple measurement, very sensitive to the variation of inductance in the signal path. but it is certainly possible to obtain an improvement of the sound.
regards
Attachments
EVA AMP Info.
Hi,
This are the photos (today on my table) of first proto, developed 4 month ago.
The version for diy (use the transformer input 100Khz at 0dB) will be ready in 3 weeks.
the shape of pcb and location components and components, are completely different from this first prototype.
Many diy have ask by pm... "it exist?" ..yes, the revolution coming soon 🙂
I can confirm the features shown on the thread "A-B Class Revolution"
The Science is an irrepressible process.
Attack me ... it does not do anything.
regards
Hi,
This are the photos (today on my table) of first proto, developed 4 month ago.
The version for diy (use the transformer input 100Khz at 0dB) will be ready in 3 weeks.
the shape of pcb and location components and components, are completely different from this first prototype.
Many diy have ask by pm... "it exist?" ..yes, the revolution coming soon 🙂
I can confirm the features shown on the thread "A-B Class Revolution"
The Science is an irrepressible process.
Attack me ... it does not do anything.
regards
Attachments
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Thank you, this is a "disease" that I'm not able to hiding 🙂
Just mounted in the air, with the curiosity if it works.
Do you have any idea of the future power rating of this amp? Could be nice on a tweeter/midrange in active setup with a SDA-400 on the bottom 😀
Only one version for diy. 60W to 400w (4R), just chose only the supply vcc.
no adjustment require,all parameters are "auto-set" in time of startup (3 Sec.)
Professional version running from 100w to 900w. in range of 8R to 1R.
no adjustment require,all parameters are "auto-set" in time of startup (3 Sec.)
Professional version running from 100w to 900w. in range of 8R to 1R.
For sure, even the shape of amp use new way to assemble. eg. on heatsink as modushop 2U, allow two eva amps at +/-58V (supplies by DPS-500-DA) on one side,obvious thank the new efficiency. but...better we wait the re-open of thread.
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Remote control DPS-400
Hi,
Simple way for external remote control on DPS-400, it include the LED with perfect on/off and blink for protections.
Info:
Today I show 2 special version of DPS-400:
DPS-400-S1 and -S2 (both available for 230Vac only)
S2 includes 2x10000uF JACKCON 105° caps
pcb green tropicalised.
20Amp output, suitable for two AB class amplifier (up to 1A of bias) or 1 Amp with power mosfet or bjt, for 2R operation.
I mean big amp.
Hi,
Simple way for external remote control on DPS-400, it include the LED with perfect on/off and blink for protections.
Info:
Today I show 2 special version of DPS-400:
DPS-400-S1 and -S2 (both available for 230Vac only)
S2 includes 2x10000uF JACKCON 105° caps
pcb green tropicalised.
20Amp output, suitable for two AB class amplifier (up to 1A of bias) or 1 Amp with power mosfet or bjt, for 2R operation.
I mean big amp.
Attachments
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Hello Roberto,
is there a way to light up the dps using a 12v trigger ?
My preamp has a 12V trigger, and I'd like to use it to power up the amp : when i remotly activate the preamp, it activates the amp.
is there a way to light up the dps using a 12v trigger ?
My preamp has a 12V trigger, and I'd like to use it to power up the amp : when i remotly activate the preamp, it activates the amp.
Yes, there are two ways with this simple scheme, also built on a pre-drilled PCB prof., it is a very nice job.
a) utilizes a small two-way relay (with iso on contacts 250Vac) example, 12V. means that the 12V are required to keep permanent "switch-on" DPS-400).
b) use a small relay (same isolation on contacts) but the type bistable. This allows with a pulse, the DPS-400 switch-on, a pulse off.
guys ... we have to save money wherever possible. 🙂
Hi,
The new setup for DPS-400-S1
Show also, the measures obtained in new amplifier high end, fully developed from a nice company.
I saw the diagram, very nice.., complex gnd plane / layers also, with a good idea of the input stages.
Show the behavior at 4R--8R of the our magic DPS-400/45V standard (rev-2). 🙂
Well, waited the ...impressive "S2" just for 20Amp output same size pcb.
The new setup for DPS-400-S1
Show also, the measures obtained in new amplifier high end, fully developed from a nice company.
I saw the diagram, very nice.., complex gnd plane / layers also, with a good idea of the input stages.
Show the behavior at 4R--8R of the our magic DPS-400/45V standard (rev-2). 🙂
Well, waited the ...impressive "S2" just for 20Amp output same size pcb.
Attachments
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