Help with DC adapter

[jj5]

Why don't you just buy a power supply that works from the mains power, instead of needing yet another supply to power the other supply???

My other bench supply is a TENMA 72-10505, but I also have two of these Riden RD6006, and I've got them now, so might as well use them than replace them!

[jj5]

The RD6006 is a buck converter that has a configurable CC mode which is what I bet the OP is relying on to charge the li-ion batteries.

To be clear: I am not charging li-ion batteries. I'm just powering the Riden RD6006 so I can use it for a bench supply.

Another forum member has developed an alternative firmware which improves the UI and adds more features. More info is available at:

https://www.eevblog.com/forum/testgear/ruideng-riden-rd6006-dc-power-supply/msg4971583/#msg4971583

Cool! I will check that out, thanks very much.

[jj5]

Ok, are you good to go?

I am indeed. Thank you again for your help! I have rewired the HP AC adapter and it is now powering my Riden RD6006 providing 19.94V:



So I'm not sure what problem I had in the first place when I made the initial post on this topic. I didn't read any voltage, but there is voltage. Probably operator error!

[MrAl]

That's interesting.  I have a PC board power supply also that needs an input from another power supply.
The reason I got that one was so I can get more than one voltage from the main power supply.  So, I can vary both now to get voltages from 0v to about 30v DC.  Without that second power supply regulator board I would only have one voltage 0v to 30vdc.

If I get a third PS controller board, I can have three outputs all independently adjustable from 0 to 30vdc.  I use mostly light current levels, but they will go up to around 5 amps which is more than I usually need.

[gnuarm]

Ok, are you good to go?

I am indeed. Thank you again for your help! I have rewired the HP AC adapter and it is now powering my Riden RD6006 providing 19.94V:



So I'm not sure what problem I had in the first place when I made the initial post on this topic. I didn't read any voltage, but there is voltage. Probably operator error!

You aren't done until you've drawn some significant power from the unit.  It might be that the brick puts out a minimal amount of power until the protocol verifies the compatibility of the brick with the laptop.  Let us know when you've drawn an amp or two.

[jj5]

You aren't done until you've drawn some significant power from the unit.  It might be that the brick puts out a minimal amount of power until the protocol verifies the compatibility of the brick with the laptop.  Let us know when you've drawn an amp or two.

Okay, will do. But what is the best way to do that? I don't yet own a programmable load. Can you recommend a programmable load which is cheap and would be good for this job? I would like to own a programmable load and maybe I could use this as an excuse to buy one... or otherwise how do I introduce a load for testing?

[gnuarm]

You aren't done until you've drawn some significant power from the unit.  It might be that the brick puts out a minimal amount of power until the protocol verifies the compatibility of the brick with the laptop.  Let us know when you've drawn an amp or two.

Okay, will do. But what is the best way to do that? I don't yet own a programmable load. Can you recommend a programmable load which is cheap and would be good for this job? I would like to own a programmable load and maybe I could use this as an excuse to buy one... or otherwise how do I introduce a load for testing?

https://www.ebay.com/itm/275384331361?hash=item401e2f6c61:g:GUsAAOSwxOFizUaY&var=575829112157

[jj5]

I was thinking I might get one of these EBD-A20H Battery Testers, what do you think?

[jj5]

https://www.ebay.com/itm/275384331361?hash=item401e2f6c61:g:GUsAAOSwxOFizUaY&var=575829112157

Thanks! I will get 12Ω 25W for testing 12V at 1A and 6Ω 25W for testing 12V at 2A. Will that be good enough do you think?

[gnuarm]

https://www.ebay.com/itm/275384331361?hash=item401e2f6c61:g:GUsAAOSwxOFizUaY&var=575829112157

Thanks! I will get 12Ω 25W for testing 12V at 1A and 6Ω 25W for testing 12V at 2A. Will that be good enough do you think?

How high will your output voltage go?  Why can't you test 2A with one resistor?   I would get the higher wattage resistors.  The rating is just a number.   24W into a 25W resistor will get really hot.  I had some 1 ohm resistors in series running around 5 amps, so 25W each, and 50W parts got hot enough to char wood if left running overnight.  That's hot!  Now, I bolt them to an aluminum plate to act as a heatsink.

[jj5]

How high will your output voltage go?

Probably not more than 12V. This is just a bench supply for playing with digital electronics. I'm expecting to use 5V, 9V, and 12V. Also the occasional small voltage for testing LEDs.

Why can't you test 2A with one resistor?

Well I can. I just figured I would test in stages... not necessary you reckon? Just go straight for the maximum?

I would get the higher wattage resistors.

Thanks! I will get 6Ω 100W for testing. Will that do?

[gnuarm]

How high will your output voltage go?

Probably not more than 12V. This is just a bench supply for playing with digital electronics. I'm expecting to use 5V, 9V, and 12V. Also the occasional small voltage for testing LEDs.

Why can't you test 2A with one resistor?

Well I can. I just figured I would test in stages... not necessary you reckon? Just go straight for the maximum?

You can change the power level by adjusting the voltage.  If you want to test multiple power levels at the same voltage, then use different resistors.

I would get the higher wattage resistors.

Thanks! I will get 6Ω 100W for testing. Will that do?

If it works for you, it works for me. 

[MrAl]

How high will your output voltage go?

Probably not more than 12V. This is just a bench supply for playing with digital electronics. I'm expecting to use 5V, 9V, and 12V. Also the occasional small voltage for testing LEDs.

Why can't you test 2A with one resistor?

Well I can. I just figured I would test in stages... not necessary you reckon? Just go straight for the maximum?

I would get the higher wattage resistors.

Thanks! I will get 6Ω 100W for testing. Will that do?

A 100 watt incandescent light bulb will give you low Ohms like around 8 or 10 Ohms at 12v.

[gnuarm]

How high will your output voltage go?

Probably not more than 12V. This is just a bench supply for playing with digital electronics. I'm expecting to use 5V, 9V, and 12V. Also the occasional small voltage for testing LEDs.

Why can't you test 2A with one resistor?

Well I can. I just figured I would test in stages... not necessary you reckon? Just go straight for the maximum?

I would get the higher wattage resistors.

Thanks! I will get 6Ω 100W for testing. Will that do?

A 100 watt incandescent light bulb will give you low Ohms like around 8 or 10 Ohms at 12v.

You can't buy them in the US any more.  At least, they are hard to find.  A 75 W incandescent bulb should work though.

[BILLPOD]

Automotive bulbs work fine for low voltage loads.   My headlight bulbs draw approx. 5 Amps on low beam, and 7.5 A on high beam, at 12 VDC.

[MrAl]

How high will your output voltage go?

Probably not more than 12V. This is just a bench supply for playing with digital electronics. I'm expecting to use 5V, 9V, and 12V. Also the occasional small voltage for testing LEDs.

Why can't you test 2A with one resistor?

Well I can. I just figured I would test in stages... not necessary you reckon? Just go straight for the maximum?

I would get the higher wattage resistors.

Thanks! I will get 6Ω 100W for testing. Will that do?

A 100 watt incandescent light bulb will give you low Ohms like around 8 or 10 Ohms at 12v.

You can't buy them in the US any more.  At least, they are hard to find.  A 75 W incandescent bulb should work though.

Yes you really have to have one already.  Some of us do.

[gnuarm]

Automotive bulbs work fine for low voltage loads.   My headlight bulbs draw approx. 5 Amps on low beam, and 7.5 A on high beam, at 12 VDC.

You need to be careful with light bulbs.  They have very low resistance when cold, which rises when they start to heat up.  Do not count on them having the resistance you need.  If you manually adjust the controls, they should be fine. 

[jj5]

You aren't done until you've drawn some significant power from the unit.

Hey Rick. My 100W 6Ω resistor arrived today and I finished the testing. Turns out the AC adapter in question could deliver more than its 45W maximum rating. The write-up for my testing is here. Thanks very much for your help with this one!

[gnuarm]

You aren't done until you've drawn some significant power from the unit.

Hey Rick. My 100W 6Ω resistor arrived today and I finished the testing. Turns out the AC adapter in question could deliver more than its 45W maximum rating. The write-up for my testing is here. Thanks very much for your help with this one!

I found I was able to read your web page in Reader View in Firefox.  Otherwise, the color scheme would have made it very difficult for me.

[jj5]

I found I was able to read your web page in Reader View in Firefox.  Otherwise, the color scheme would have made it very difficult for me.

Yes, I'm sorry about that. It was designed as a bit of a joke, but it's not very practical. I should probably change it. In the mean time thank goodness for Firefox Reader View.

[jj5]

I found I was able to read your web page in Reader View in Firefox.  Otherwise, the color scheme would have made it very difficult for me.

I fixed this now. Thanks for your feedback!