Alex_J said:
As far as I can see you have both UcD modules connected to the same bank of capacitors / fed from the same transformer/bridge.
It's better to have separate transformers/bridge/capacitors for each module to avoid hum problems as you have now and also for better sound (channel separation).
300-400VA / 2x28 VAC transformer / double bridge / 20.000 uf per rail would be more than enough per UcD 180 module, if not on the overkill side.
I use this configuration to drive some ill-behaved speakers (Infinity RS II - poor efficiency and impedance drops to 2 ohms) and it's more than enough for normal listening levels at home. Sounds great, too 🙂
Also make sure to use pseudo-balanced interconnects (signal (-) connected to shield AT the source) if not going for full-balanced to avoid noise pickup.
Placing the modules at a close distance to a mains transformer may also get you into noise problems.
General power supply related articles (not the best ones but they should give you an idea on building supplies):
http://sound.westhost.com/power-supplies.htm
http://www.tnt-audio.com/clinica/ssps1_e.html
@alex_j
Ah now I see the drawing. It's not as detailed as I wanted to... How have you wired the RCA's for instance?
Ah now I see the drawing. It's not as detailed as I wanted to... How have you wired the RCA's for instance?
>>"concoction": what a word! 😀
About "active" system:
When I first saw Hypex modules I dreamed of a system like that and then about a new listening room ("multipurpose") for it. When I finally did them (6.8m*4.m*2.7m; walls are in fact "bass traps") I had enough spare wood to build two heavy woofers and a big solid wood rack 😎 lucky me!
Now, the Bank could earn this someday.
>>It will probably happen once I have finished developing the new 8-ch DAC and DSP unit (you might know of my involvement in www.grimmaudio.com. The DSP unit is referred to as DD1 there). That would make a neat digitally filtered active system.<<
Now that you mention it (and I know it is completelly out of topic) would Hypex turn its attention to (affordable) DAC modules in the near future??
😉
Regards
Mauricio
About "active" system:
When I first saw Hypex modules I dreamed of a system like that and then about a new listening room ("multipurpose") for it. When I finally did them (6.8m*4.m*2.7m; walls are in fact "bass traps") I had enough spare wood to build two heavy woofers and a big solid wood rack 😎 lucky me!
Now, the Bank could earn this someday.
>>It will probably happen once I have finished developing the new 8-ch DAC and DSP unit (you might know of my involvement in www.grimmaudio.com. The DSP unit is referred to as DD1 there). That would make a neat digitally filtered active system.<<
Now that you mention it (and I know it is completelly out of topic) would Hypex turn its attention to (affordable) DAC modules in the near future??
😉 Regards
Mauricio
Re: >>"concoction": what a word! 😀
Not in the plans I'm afraid. Besides, is a DAC IC not very nearly a finished DAC module?maxlorenz said:Now that you mention it (and I know it is completelly out of topic) would Hypex turn its attention to (affordable) DAC modules in the near future??
Multichannel single supply
Hi Bruno,
In your profesional opinion, if 6 modules of UCD180 being serve by a single supply (1KVA transformer double bridge retifier with 2 22000uF 100V Caps), will it works well without humming issue??
I would like to build a multichannel amps as above to drive my high efficient multiway horns system via digital crossover........
Hi Bruno,
In your profesional opinion, if 6 modules of UCD180 being serve by a single supply (1KVA transformer double bridge retifier with 2 22000uF 100V Caps), will it works well without humming issue??
I would like to build a multichannel amps as above to drive my high efficient multiway horns system via digital crossover........
Re: Re: Master Bruno said: "I've never built an active system"
Hi Bruno,
Are you planning to make a unit that does something similar as the DEQX PDC? Would the Grimmaudio DAC and DSP have the software for speaker measurement and x-over filter calculation included?
Best regards
Gertjan
Bruno Putzeys said:
I know that I should but I'm even scrambling for time to treat the acoustics of my living room so how am I supposed to find time to build an active system? That bit of spare time I have goes into posting on forums
I designed my speakers with active drive in mind. The passive crossover is a temporary concoction lying on the floor behind the box with wires sticking out on all sides. It's just screaming "make me active". Especially when you consider that the intended 1x400+2x180 active system would take up exactly as much space as the passive xover.
The only excuse I can always make of course is that a passive system makes it easier to do listening tests on amps.
It will probably happen once I have finished developing the new 8-ch DAC and DSP unit (you might know of my involvement in www.grimmaudio.com. The DSP unit is referred to as DD1 there). That would make a neat digitally filtered active system.
Hi Bruno,
Are you planning to make a unit that does something similar as the DEQX PDC? Would the Grimmaudio DAC and DSP have the software for speaker measurement and x-over filter calculation included?
Best regards
Gertjan
Re: Multichannel single supply
If you correctly wire the inputs (differential, so you can sense GND at the signal source), you should not be getting any hum.SEIJI said:
Re: Re: Re: Master Bruno said: "I've never built an active system"
No, I'd just measure my own speakers, calculate the coefficients and paste them into the DSP source code. We've got no plans to make a loudspeaker controller product. This box is intended for SRC/Format conversion between all flavours of PCM and DSD.ghemink said:
Hi !
when we talk about removing 22uF caps (with 100k input and 8620) we are talking about C7 and C8, caps near the opamp, i'm right ? TIA
Pa
when we talk about removing 22uF caps (with 100k input and 8620) we are talking about C7 and C8, caps near the opamp, i'm right ? TIA
Pa
Bruno Putzeys said:
He can try 2107. Sound is close.
You can find special soic support to solve 627 use with UcD module but your module will look like a christmas tree. 😉
But both are better used in an output circuit than in an input amplifier circuit. Better to use 2134 or 8620 (with this last one, be careful with high frequency, can be too harsh depending of your loudspeakers).
Personally, I use 2134 but some will not like the BB sound.
Stef...
I have UcD400's with 8620 and running them on Nautilus 804's, known to take no prisoners in the treble area (what goes in *HARSH* comes out *HARSH*)
I must say the treble is perfect, sounds as neutral as I ever heard, so don't worry about 8620 high-end of the spectrum.
I must say the treble is perfect, sounds as neutral as I ever heard, so don't worry about 8620 high-end of the spectrum.
Yes this one but the real URL is: http://cimarrontechnology.com/
I bought some of them but I never tried them yet. I'm a little afraid to have to solder many time the soic adapter on the UcD module.
Currently, I do op-amp testing with another piece of equipment (a good tuner). I installed a socket in place of the audio output op-amp. I can listen each of them very easily with one speaker in mono. The difference is really important between each op-amp.
The problem is the power rail and the circuit around the op-amp. I'm sure, the circuit around the opamp can change the sound. For this reason, It's difficult to say that a particular op-amp who work well in a design will sound same in another design.
A good test system will be a UcD module dedicated to test with a soic adapter in 2 parts. A first soic part soldered on the PCB, and a second part with the op-amp, who can be removed and exchanged. And a complete collection of op-amp...
Only one module will be necessary with just a CD player and a "mono" cable, an UcD module and one transparent loudspeaker as a small Dynaudio box.
With this we can do real comparaison tests.
I bought some of them but I never tried them yet. I'm a little afraid to have to solder many time the soic adapter on the UcD module.
Currently, I do op-amp testing with another piece of equipment (a good tuner). I installed a socket in place of the audio output op-amp. I can listen each of them very easily with one speaker in mono. The difference is really important between each op-amp.
The problem is the power rail and the circuit around the op-amp. I'm sure, the circuit around the opamp can change the sound. For this reason, It's difficult to say that a particular op-amp who work well in a design will sound same in another design.
A good test system will be a UcD module dedicated to test with a soic adapter in 2 parts. A first soic part soldered on the PCB, and a second part with the op-amp, who can be removed and exchanged. And a complete collection of op-amp...
Only one module will be necessary with just a CD player and a "mono" cable, an UcD module and one transparent loudspeaker as a small Dynaudio box.
With this we can do real comparaison tests.
Hi !
After a late night tweak
, i've inverted the ground and the -vpp at the input of a module. The blue led shine and the fuse of my ps is breaking.
Does anybody knows if some components could be change, something like T2 could have break before the rest and thus protecting the rest of the module...
Thanks for your help...
PA
After a late night tweak
, i've inverted the ground and the -vpp at the input of a module. The blue led shine and the fuse of my ps is breaking.Does anybody knows if some components could be change, something like T2 could have break before the rest and thus protecting the rest of the module...
Thanks for your help...
PA
I'm afraid the module has a better chance at surviving an accidental power-up with +VP and -VP reversed (provided the PSU has fuses) than with either switched with GND.pa said:Hi !
After a late night tweak
Does anybody knows if some components could be change, something like T2 could have break before the rest and thus protecting the rest of the module...
Thanks for your help...
PA
The problem is that quite a few small-signal parts will have burned out, including some on the modulator plugin.
If you're accident-prone (as in: wee small hours and still sold(i)ering) you could attach a few heavy rectifier in reverse across VP to GND and GND to -VP. This insures the fuse in your PSU blows without further damage to the module.