DC power supply 13.8V 20A $99
08-11-2005, 10:58 PM
#31
Unless you pay alot of money for a switchmode the output will have some sort of noise. Even the medical grade supplys i work on have some noise.
This is caused by the fast switching FETS. The noise generated by the cheap power supply is not that excessive for how cheap it is.
I expected worse.
To get a completly clean no noise output use a 12v battery
It is good enough for tire truers and I have used it on my chargers as they have some filtering on the input.
Still to test under constant high current which I will try this weekend while trueing a heap of tires.
This is caused by the fast switching FETS. The noise generated by the cheap power supply is not that excessive for how cheap it is.
I expected worse.
To get a completly clean no noise output use a 12v battery
It is good enough for tire truers and I have used it on my chargers as they have some filtering on the input.
Still to test under constant high current which I will try this weekend while trueing a heap of tires.
08-11-2005, 11:30 PM
#32
I use my car battery mainly because I have a crappy power supply. I have no dramas using my car battery. I have found it actually charges my batteries quicker and loads them with more MAH? Dunno why as I am a n00b but it does.
08-13-2005, 01:24 AM
#33
so there is no real advantage of a regulated PSU over a Switchmode PSU for charging?
08-14-2005, 08:17 PM
#34
Originally Posted by offroader
well the voltage looks quite choppy with the jaycar switch mode one. I emailed them, the weight of the unit is 1.55 kg
I am selling my powertech transformer 15A to a friend so i can get a stichmode one. I am looking at the team much more one 20A, looks sick and small profile too. Anyone got an issue with those? They cost a lot more than the jaycar one, but is the voltage still choppy?
I am selling my powertech transformer 15A to a friend so i can get a stichmode one. I am looking at the team much more one 20A, looks sick and small profile too. Anyone got an issue with those? They cost a lot more than the jaycar one, but is the voltage still choppy?
Anyone have anything bad to say about the powertech 15A (apart from it's weight)? mine hasnt missed a beat, and the fans inside are "cleaver".. they stay on for more cooling despite the load on the supply dropping to little or none.
James
08-15-2005, 12:36 AM
#35
Originally Posted by Tabor
Unless you pay alot of money for a switchmode the output will have some sort of noise. Even the medical grade supplys i work on have some noise.
This is caused by the fast switching FETS. The noise generated by the cheap power supply is not that excessive for how cheap it is.
I expected worse.
To get a completly clean no noise output use a 12v battery
It is good enough for tire truers and I have used it on my chargers as they have some filtering on the input.
Still to test under constant high current which I will try this weekend while trueing a heap of tires.
This is caused by the fast switching FETS. The noise generated by the cheap power supply is not that excessive for how cheap it is.
I expected worse.
To get a completly clean no noise output use a 12v battery
It is good enough for tire truers and I have used it on my chargers as they have some filtering on the input.
Still to test under constant high current which I will try this weekend while trueing a heap of tires.
Are we chasing something we don’t really need?
Probably the most sophisticated piece of equipment we will be running off these power supplies would be our battery charger to charge our packs.
One would expect the manufacturer of these chargers would have design them to run off a car battery. With that in mind and knowing that the car battery will be required to charge up several packs in a day it would be also assume that we would start-up our car engines and put some charge back into the car battery while charging our packs. The charging circuit from the car is not ripple free by any means.
My point is, wouldn’t our chargers be quite tolerant to this and much worst noise……
Regards,
Peter
08-15-2005, 02:08 AM
#36
Tech Master
iTrader: (5)
intellipeak ice
like my title says i own one of them chargers and have to say for a noob there hard to negotitate just my lil biatch it doesnt tell ye what to do incase false peaks etc and im still learning but hey my gp3700 peak and have decent runtime thats all i want any way i want a power supply and every one is talking bout the jaycar ones what the verdict are they good enough or just junk???? all i need to run is the charger and a few fans?? one for battery one for motor and maybe one for itself also i might add another fan to the ice cause i just think it gets to warm but im just scared of damaging it.
any way i was looking for about a 15 amps unit give or take depending on price any ideas???? ps i am on a budget (lol seems like every one is lately)
any way thanks for anyideas u have
any way i was looking for about a 15 amps unit give or take depending on price any ideas???? ps i am on a budget (lol seems like every one is lately)
any way thanks for anyideas u have
08-15-2005, 03:49 AM
#37
Tech Fanatic
Originally Posted by James
I wouldnt sell a powertech 15A supply, they are excellent. (unless the weight of the unit bothers you?)
Anyone have anything bad to say about the powertech 15A (apart from it's weight)? mine hasnt missed a beat, and the fans inside are "cleaver".. they stay on for more cooling despite the load on the supply dropping to little or none.
James
Anyone have anything bad to say about the powertech 15A (apart from it's weight)? mine hasnt missed a beat, and the fans inside are "cleaver".. they stay on for more cooling despite the load on the supply dropping to little or none.
James
08-15-2005, 04:08 AM
#38
Cant say for every charger, but my chargers work fine and has so for the last week and a half.
No issues.
I cant see the Jaycar power supply being a real problem.
If you are still worried whack a couple of large caps on the output of the power supply, this will remove some noise and any transient voltage spikes.
I am getting hold of a few other more expensive power supply's to do comparisons on. I will post the videos once completed.
No issues.
I cant see the Jaycar power supply being a real problem.
If you are still worried whack a couple of large caps on the output of the power supply, this will remove some noise and any transient voltage spikes.
I am getting hold of a few other more expensive power supply's to do comparisons on. I will post the videos once completed.
08-16-2005, 01:31 AM
#39
Tech Adept
I've had my eye on this one for a while, what do you guys think...
http://cgi.ebay.com.au/CRAZY-40-AMP-...QQcmdZViewItem
http://cgi.ebay.com.au/CRAZY-40-AMP-...QQcmdZViewItem
08-16-2005, 08:43 PM
#40
Tech Apprentice
iTrader: (2)
Originally Posted by implusepro
I've had my eye on this one for a while, what do you guys think...
http://cgi.ebay.com.au/CRAZY-40-AMP-...QQcmdZViewItem
http://cgi.ebay.com.au/CRAZY-40-AMP-...QQcmdZViewItem
As for the $99 PSU, for that price you really cannot go wrong, the amount of ripple that was shown in those scans wouldn't affect 99% of chargers, they wont have a problem.
11-30-2005, 07:14 PM
#42
Just wondering from the guys who have bought one of these power supplies how they are holding up after a few months?
I am looking at getting one and if anyone has had any problems with them could they please let me know. It would be drawing about 12a constant.
As previously said, for $99 you really can't go wrong but if they are unreliable, I would prefer to spend a little extra and get a more proven unit.
I am looking at getting one and if anyone has had any problems with them could they please let me know. It would be drawing about 12a constant.
As previously said, for $99 you really can't go wrong but if they are unreliable, I would prefer to spend a little extra and get a more proven unit.
11-30-2005, 09:59 PM
#43
I have been using one for the past 3 months without a single problem. I have run a charger, tyre warmers, motor cooler and a MMS with lathe all at the same time and it hasn't missed a beat. 
)
11-30-2005, 10:49 PM
#45
Originally Posted by SchuMi2
I have been using one for the past 3 months without a single problem. I have run a charger, tyre warmers, motor cooler and a MMS with lathe all at the same time and it hasn't missed a beat.
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
