Ok, Doing some progress...
I got Doede's Eaton pack from digikey...and charged it with my CC/CV lab supply psu. As the clocks are running in a pretty wide voltage spectrum, I charge them to 17V (which is what Andreas battery supply as well uses) and let two Drixo play in parallel...after 10 Min we are at 15.5V. Assuming that you could down to 12.5V, this mean that one pack would be good for 30min "UCpure" time for two clocks or 1 hour for one clock (no PSU connected, so the uptracap is like a battery). That is not bad and a cheap way of understand the sound differences.
The re-charging takes maybe 1 min with a 5A supply and can be done without destaching the Cap...
What is interesting is that this bank has a fairly high self-discharging rate, so after 3-4 hours of not using it the 17V drops to 14V withou any consumer attached to it...I guess the balancing circuits have some LEDs on it.
Soundwise i need to build a switch in so I can switch between supplies without the clocks being switched off...Even the 10sec unpowered seem to harm the performance of the clocks when switching the plugs.
So, stay tuned...
I got Doede's Eaton pack from digikey...and charged it with my CC/CV lab supply psu. As the clocks are running in a pretty wide voltage spectrum, I charge them to 17V (which is what Andreas battery supply as well uses) and let two Drixo play in parallel...after 10 Min we are at 15.5V. Assuming that you could down to 12.5V, this mean that one pack would be good for 30min "UCpure" time for two clocks or 1 hour for one clock (no PSU connected, so the uptracap is like a battery). That is not bad and a cheap way of understand the sound differences.
The re-charging takes maybe 1 min with a 5A supply and can be done without destaching the Cap...
What is interesting is that this bank has a fairly high self-discharging rate, so after 3-4 hours of not using it the 17V drops to 14V withou any consumer attached to it...I guess the balancing circuits have some LEDs on it.
Soundwise i need to build a switch in so I can switch between supplies without the clocks being switched off...Even the 10sec unpowered seem to harm the performance of the clocks when switching the plugs.
So, stay tuned...
Has any one used the new 3.8V Ultra capacitors https://amzn.to/3m7TgE7
up to 750 F (ROHS ?) or bigger
Also mouser has some 220F.
This will eliminate the need to put 2 caps in series for a 3.3v saving a lot of space I hope that trickles to the big 3000F ones
-------------------------------------
See my Youtube Chanel
up to 750 F (ROHS ?) or bigger
Also mouser has some 220F.
This will eliminate the need to put 2 caps in series for a 3.3v saving a lot of space I hope that trickles to the big 3000F ones
-------------------------------------
See my Youtube Chanel
Is it going to have a 12V version available in the future?
I think this Ucpure product is so good, should be available from 3.3v to 24v! no kidding
No longer needed. For anyone coming across this, I have used a capacitor and a resistor in paralel to increase power on signal duration (e.g. 470 uF and 92KOhm resistor). Final duration of the signal should be aprox. initial duration in s + (R*C)s - both R and C values in F and Ohm. Experiment with different values.
@iancanada please advise. Due to the release of the LinearPi MkII, what is the preferred solution for the 3.3V line. LinearPi MkII or the variant with LifePO4 Mini 3.3V power supply is preferable (in both cases the UcConditioner 3.3V is supposed to be used )
For UCPure and LifePo4 mini should there be any difference in sound quality between powering directly with AC or using a DC power supply? The LifeP04 manual suggests the quality of the DC power supply might lower EMI noise in the environment so theoretically a DC supply might provide some improvement.
Hello,
Does the quality of DC input have business with the PurePi output quality? The pure LifePO4 battery output is 100% isolated from the input at the pure mode. And the on-board battery charger will also be disabled in pure output mode. So theoretically the quality of battery outputs will have no business with the quality of the input DC power supply.
IF the DC is created at the circuit it probably is better to twist the AC wiring to the circuit board and let it run close to the chassis ( same like heater supply in a tube amp)
I remember seeing video on cheap and a bit better SMPS compared to ''traditional supplies '' with some kind of '' noise detector'' and things were pretty obvious. Probable not a good idea to have some '' clock circuitry '' close by.
Greetings, eduard
Does the quality of DC input have business with the PurePi output quality? The pure LifePO4 battery output is 100% isolated from the input at the pure mode. And the on-board battery charger will also be disabled in pure output mode. So theoretically the quality of battery outputs will have no business with the quality of the input DC power supply.
IF the DC is created at the circuit it probably is better to twist the AC wiring to the circuit board and let it run close to the chassis ( same like heater supply in a tube amp)
I remember seeing video on cheap and a bit better SMPS compared to ''traditional supplies '' with some kind of '' noise detector'' and things were pretty obvious. Probable not a good idea to have some '' clock circuitry '' close by.
Greetings, eduard
@eduard
DC input doesn't directly affect the pure 3.3V battery output of a PurePi. However it may affect the 5V ultracapacitor output quality. And if you use a SMPS, small amount of EMI noise may across the isolation barrier through air. So, in any case, Linear DC input is always preferred as long as it is possible.
Ian
DC input doesn't directly affect the pure 3.3V battery output of a PurePi. However it may affect the 5V ultracapacitor output quality. And if you use a SMPS, small amount of EMI noise may across the isolation barrier through air. So, in any case, Linear DC input is always preferred as long as it is possible.
Ian
Ian, is DC always preferred to AC? I am getting some strange issues trying to feed LifePo4 AC directly. I didn't think the way the transformer secondaries are connected should matter, but depending how I connect them sometimes I cannot get the LifePo4 to output in pure mode and sometimes the Omron part gets very warm depending on the orientation. I believe that is the diode?
AC directly has created issues with the pure light not coming on consistently so perhaps there’s an issue with my transformer set up that interposing DC supply between helps alleviate. I am feeding two lifepo4 units from one transformer with dual secondaries. They are rated for 9v but measure closer to 11-11.5 so maybe that is high for feeding AC directly.
Hello,
If the lifepo4/supercap has enough juice to play for a few hours before recharging i would use it like this all the time. You dont wanna have impurities from your power supply company messing up your clean DC.
I guess if there is no charging proces working inside your chassis your lineair power supply wont transmit a lot of disturbances.
The Raspberry will probably benefit from a non smps. That is why i decided to use a choke input power supply.
My idea is that a choke will work in both directions so also reducing '' disturbances '' from one digital circuit to another circuit.
Greetings, eduard
If the lifepo4/supercap has enough juice to play for a few hours before recharging i would use it like this all the time. You dont wanna have impurities from your power supply company messing up your clean DC.
I guess if there is no charging proces working inside your chassis your lineair power supply wont transmit a lot of disturbances.
The Raspberry will probably benefit from a non smps. That is why i decided to use a choke input power supply.
My idea is that a choke will work in both directions so also reducing '' disturbances '' from one digital circuit to another circuit.
Greetings, eduard