Ciunas Audio
Trade: Ciunas Audio
Btw, is this SDR you are using?
Btw, is this SDR you are using?
One characteristic of the LiFePO4 batteries is that they hold their voltage at 3.2V right up to just near depletion when there's a sharp drop off in voltage.In my case, no. Its an ancient radio receiver I'm running at present on some NiCads. It works best at 12V. But the NiCad voltage tends to gradually drop as the cells discharge. This affects performance. Hence I'm considering alternatives.
Please add me to the 5v list for a Chord Qutest (Aspro)
According to Rob Watts the Chord DAC designer the Qutest works best with its own switch mode PSU so there's a challenge for your power supply. I'm assuming that you can guarantee that the voltage is 5 volts or as near as damnit! How does the demo/ audition work in practice?5V PS list
Owl
Spenagio
Mort2k (Rob)
Aspro
Other voltages PS list
Paul Burke (20V)
I just changed the variable voltage list to "other voltages list" & ask people to nominate the voltage they're interested in
Thanks Aspro
Yes, voltage will be 5.1V to accommodate a small voltage drop on the DC power cable. That puts me in mind of a detail I haven't thought of - what DC input sockets do people have on their device to be powered?According to Rob Watts the Chord DAC designer the Qutest works best with its own switch mode PSU so there's a challenge for your power supply. I'm assuming that you can guarantee that the voltage is 5 volts or as near as damnit! How does the demo/ audition work in practice?
Yes, voltage will be 5.1V to accommodate a small voltage drop on the DC power cable. That puts me in mind of a detail I haven't thought of - what DC input sockets do people have on their device to be powered?
My PS will have a 2.1mm output socket so I'm wondering about cables
Like the DAC tour, when you receive the package you have a week to evaluate the PS & post it onto the next person in the list whose address I will PM to you. All I ask is that you post your impressions here.
If I understand, your SMPS powers the Qutest via a USB style cable? Is this a fixed cable coming out of the SMPS or removable? The input DC socket on the Qutest is USB type A?Voltage sounds fine as does the procedure. Cables/adaptors will be an issue though (input and output). I will need a USB A to 2.1dc(input) and 2.1dc to micro USB(output). I'm happy to source these. They are not expensive but sometimes they end up coming from China so advance notice would be good. Either you ask people what connections they will need and supply them or give them advance notice if they need to source them.
I was due to send out the first 5V PS this week but things got busy - should be next weekWhat is the timing for the initial dispatch to the first person on the list?
Happy to post my impressions here and also the Qutest thread on Head-fi where Rob Watts is likely to respond so no hiding place!
If I understand, your SMPS powers the Qutest via a USB style cable? Is this a fixed cable coming out of the SMPS or removable? The input DC socket on the Qutest is USB type A?
I will include in the package three DC cables - male 2.1mm to USB type A (short); female 2.1 to USB type A (short) & 2.1mm to 2.1mm cable to extend these. So you should be OK 2.1mm DC to type A will power the Qutest, I think?
I was due to send out the first 5V PS this week but things got busy - should be next week
GreatQutest is micro USB input but I will source my own cables/adaptors now I know what is supplied.
The quality isn't an issue but the voltage needs to be >7 & <30V. The current output of the charger needs to be greater than the current requirements of what is being powered by the PS. It's easier to deal in watts when considering this - if your device requires 1 amp 5V, that's 5 watts required & your charger should have a greater output than this i.e 9V@ 1Amp is 9 wattsIs the quality/output level of the charger an issue?
Up to 3Amp continuous output but far greater than this for instant current demandsWhat output does the unit provide? I think the Qutest only needs 500 mv.
I wrote about the this at the beginning of the thread - biggest difference is that there are no voltage regulators on the supercap PS output - it's current directly from the supercaps which makes a big difference with dynamic current demand.How does your unit compare with the Uptone Ultracap? It's cheaper but the introductory price seems to have gone up to 171 €.
Great
The quality isn't an issue but the voltage needs to be >5 & <30V. The current output of the charger needs to be greater than the current requirements of what is being powered by the PS. It's easier to deal in watts when considering this - if your device requires 1 amp 5V, that's 5 watts required & your charger should have a greater output than this i.e 9V@ 1Amp is 9 watts
Up to 3Amp continuous output but far greater than this for instant current demands
I wrote about the this at the beginning of the thread - biggest difference is that there are no voltage regulators on the supercap PS output - it's current directly from the supercaps which makes a big difference with dynamic current demand.
Yes, I had to include the 5% Paypal fee in the price but this is refundable if you avoid paypal fees when paying or use Transferwise - unfortunately, I couldn't make this refund automatic in my checkout so I have to refund manually once you let me know you have paid in this way.
Right butit's not "lack of regulation" - it's where the regulation happens - I use regulation before the supercaps because outputting power direct from supercapacitors (or batteries) makes a significant difference to having a voltage regulator on the output. It's not just about being limited by the power handling of the regulator but rather about the way regulators handle dynamic current delivery.Sorry, I did pick up on the lack of regulation. I was really thinking about type of capacitors used and total capacity. For example I am impressed your PS produces over 3 amps when the Uptone produces 1 amp I think.
The supercap PS must use a charger voltage rating which is 2V greater than the rated voltage output of the PS. More powerful is better just to ensure that the supercaps are always fully charged when in operation i.e there's no possibility of a sag.It certainly makes it seems good value and I look forward to trying it. I currently use the SMPS as directed by Chord. I think there must be room for improvement given my previous experience.
I didn't realise the input voltage could be so variable. I assumed it had to be 5v. Is more powerful better?
Thanks for the payment clarification.