Hey guys...
I used the White Noise Audio loudspeaker protection unit for my monoblocks. It works a treat 😉
The protection unit can accept 12 VAC to power it so when I got my transformers made, I asked for a 12V secondary also so I power the unit straight from my transformer.
These amps sound fantastic....I am so happy with them. A big thanks and thumbs up to Bruno and Jan-Peter.
Cheers,
I used the White Noise Audio loudspeaker protection unit for my monoblocks. It works a treat 😉
The protection unit can accept 12 VAC to power it so when I got my transformers made, I asked for a 12V secondary also so I power the unit straight from my transformer.
These amps sound fantastic....I am so happy with them. A big thanks and thumbs up to Bruno and Jan-Peter.
Cheers,
Attachments
whams said:Hey guys...
I used the White Noise Audio loudspeaker protection unit for my monoblocks. It works a treat 😉
The protection unit can accept 12 VAC to power it so when I got my transformers made, I asked for a 12V secondary also so I power the unit straight from my transformer.
These amps sound fantastic....I am so happy with them. A big thanks and thumbs up to Bruno and Jan-Peter.
Cheers,
That monoblock looks fantastic! Did you build the power supply or buy "off-the-shelf." The caps look like Nichicon Muse (KZ) from the top?
Great job!
PassiveO said:
Thanks for that!
I still have a few more things to do to it.....I want to tidy up the wires a bit and run the led you see sticking out of the speaker protection module out to the front panel etc.
I had some pcb's made up for my power supply. I had a look at a few 'off the shelf' power supplies but decided to make my own in the end.
The caps are Nichicon KG Gold's 4700uf/63V so I have a bit under 10000uf per rail. I have made up a few other power supplies too (I got more power supply pcbs made then I needed so I could do this) but this time I have used BHC AerovoxALC 6800uf/63V. I plan to swap between the two at some stage to see which caps I prefer.
Thanks for your kind words...
Cheers,
Dave
UcD400 power supply
Hi Guys,
I am going to build my two monoblocks with UcD400 modules. I am still undecided about transformers and capacitors, how many VA do I need for each channel, which voltage for the secondary and how many muF for capacitors? What about your own experiences and experiments?
I hope in yours suggestions,
KEPha
Hi Guys,
I am going to build my two monoblocks with UcD400 modules. I am still undecided about transformers and capacitors, how many VA do I need for each channel, which voltage for the secondary and how many muF for capacitors? What about your own experiences and experiments?
I hope in yours suggestions,
KEPha
You could just buy (or copy) the Hypex PS modules. Or choose something like 500VA/42VAC sec + 2*22000uF/63V per channel.
That should do the trick rather well.
If you want to save som cost a 300VA toroid/channel is also sufficient for normal use.
That should do the trick rather well.
If you want to save som cost a 300VA toroid/channel is also sufficient for normal use.
is a bit tight, but thats whats in the Hypex PS. Of course 80V will probably last longer. Or you could go for a 40V AC (and a little less power)
I once read (i think it was on the LCaudio site) that for quality caps its no problem to be operated on their maximum voltage value. Cant find that statement anymore...
Hello,
We use in our standard PS the BCC (Formely Philips) 056 series rated for 63VDC. With our standard 500VA transformer 2 x 42VAC we have a DC voltage of 57VDC. This is a nice margin of 10%.
Besides this the quality of these capacitors is VERY high. We have used this capacitor since 1996, in our PA amplifiers. I don't know how many thousends pieces we already have used, but we have had never one failure with this capacitor.
Regards,
Jan-Peter
We use in our standard PS the BCC (Formely Philips) 056 series rated for 63VDC. With our standard 500VA transformer 2 x 42VAC we have a DC voltage of 57VDC. This is a nice margin of 10%.
Besides this the quality of these capacitors is VERY high. We have used this capacitor since 1996, in our PA amplifiers. I don't know how many thousends pieces we already have used, but we have had never one failure with this capacitor.
Regards,
Jan-Peter
Jan Peter,
Are you going to release the schematics with componentvalue's of your dc protection? (For those who (have) built their own power supply?
Are you going to release the schematics with componentvalue's of your dc protection? (For those who (have) built their own power supply?
No, we don't will give the schematic free. Altough there is no real secret's inside.
Supose we would give the schematics free we wil get even more emails as we have now.
And they must all be read........
Regards,
Jan-Peter
Supose we would give the schematics free we wil get even more emails as we have now.
And they must all be read........
Regards,
Jan-Peter
I don't think you will save a lot of money by building them by yourself. The standard version will cost you EUR 65.00 ex. VAT.
Jan-Peter
Jan-Peter
It wasn't about the cost. I already had the parts before Hypex had the powersupply. That's why I'm interested.
Using RCA terminal
Hi, I have a spare chasis that I can use for my UCD400, however, it is one with a RCA terminal.
I have come across positing about using IC with RCA at one end and WLR on the other end. However, I have not come across any info using RCA - RCA interconnect and convert unbalanced signal to the In+, Gnd and In-
I wonder if the following arrangement is OK
RCA+(source) --> RCA+(UCD chasis) --> IN+ on PCB
RCA Gnd(source) --> RCA Gnd (UCD Chasis) --> In- on PCB
Cable shield connecting to the RCA Gnd(source) & RCA Gnd (UCD Chasis) at both ends --> Gnd on PCB
Thanks for the help
Hi, I have a spare chasis that I can use for my UCD400, however, it is one with a RCA terminal.
I have come across positing about using IC with RCA at one end and WLR on the other end. However, I have not come across any info using RCA - RCA interconnect and convert unbalanced signal to the In+, Gnd and In-
I wonder if the following arrangement is OK
RCA+(source) --> RCA+(UCD chasis) --> IN+ on PCB
RCA Gnd(source) --> RCA Gnd (UCD Chasis) --> In- on PCB
Cable shield connecting to the RCA Gnd(source) & RCA Gnd (UCD Chasis) at both ends --> Gnd on PCB
Thanks for the help
Re: Using RCA terminal
Hi Arthur,
You can find the answer here:
http://www.hypex.nl/classd/UcD400.pdf
GND of RCA goes to GND of UcD and In- of UcD goes to GND of RCA as well. RCA + goes to the In+ of the UcD.
However, it is always advised (although not required) to connect the In- to the GND at the source (i.e. preamp) so that you basically have an symmetric connection from preamp to UcD. However, seems in your case that your UcD chassis does not have XLR connection, so then you can't do that.
Best regards
Gertjan
ackcheng said:
Hi Arthur,
You can find the answer here:
http://www.hypex.nl/classd/UcD400.pdf
GND of RCA goes to GND of UcD and In- of UcD goes to GND of RCA as well. RCA + goes to the In+ of the UcD.
However, it is always advised (although not required) to connect the In- to the GND at the source (i.e. preamp) so that you basically have an symmetric connection from preamp to UcD. However, seems in your case that your UcD chassis does not have XLR connection, so then you can't do that.
Best regards
Gertjan
What about different transformers
Hi to evryone,
did anyone tryied a PSU using trasformers different from toroidals, for example c-core? I wonder how transformers topology influences the sound of this babies!
The other question is: on the basis of your experiments with toroidals, if you should compare the sound and features of your UcD400 based amplfication in terms of dynamic, spectrum features, etc., to which closest and well known product you would put your DIY amp? This just to make an idea of the sound style I could get with toroidals. If someone answers this, could you possibly mention the equipment used?
Thank you, have nice day with your music,
KEPha
Hi to evryone,
did anyone tryied a PSU using trasformers different from toroidals, for example c-core? I wonder how transformers topology influences the sound of this babies!
The other question is: on the basis of your experiments with toroidals, if you should compare the sound and features of your UcD400 based amplfication in terms of dynamic, spectrum features, etc., to which closest and well known product you would put your DIY amp? This just to make an idea of the sound style I could get with toroidals. If someone answers this, could you possibly mention the equipment used?
Thank you, have nice day with your music,
KEPha
Re: What about different transformers
Toroids come in various performance levels, depending on who made them. Theory has it that toroids do not produce a stray field (each winding's stray field is cancelled by the other windings), but this is indeed theory. Where the leads come out, there's a hole in the windings that can radiate quite significantly. I had almost forgotten about it until this weekend I stumbled upon a particularly nasty case.
Other shapes (like C cores) can have a lower stray field associated with output current (odd harmonics of 50Hz) but a larger one associated with the excitation itself (50Hz fundamental).
You can make a test probe by attaching a wire loop at the end of a coax cable and feeding that into a sensitive amplifier. This allows you to find out which side of the transformer is quietest.
I don't think an amplifier should have a "sound" of its own at all, which is what I'm trying to achieve.kephaudio said:
Toroids come in various performance levels, depending on who made them. Theory has it that toroids do not produce a stray field (each winding's stray field is cancelled by the other windings), but this is indeed theory. Where the leads come out, there's a hole in the windings that can radiate quite significantly. I had almost forgotten about it until this weekend I stumbled upon a particularly nasty case.
Other shapes (like C cores) can have a lower stray field associated with output current (odd harmonics of 50Hz) but a larger one associated with the excitation itself (50Hz fundamental).
You can make a test probe by attaching a wire loop at the end of a coax cable and feeding that into a sensitive amplifier. This allows you to find out which side of the transformer is quietest.