Author Topic: Hiland kit for dual/symmetric bench power supply?  (Read 1972 times)

0 Members and 1 Guest are viewing this topic.

Offline jaudoTopic starter

  • Newbie
  • Posts: 2
  • Country: es
Hiland kit for dual/symmetric bench power supply?
« on: December 23, 2019, 12:17:23 am »
Hi guys,

I want an adjustable dual power supply both voltage and current to power op-amps.
My goal is to have an electronics workbench and so far the only thing I lack is a dual power supply.

Because standard dual bench power supplies are pretty expensive, I decided to buy a couple of Hiland kits linear adjustable power supply and a couple of 24 VAC transformers.
I have mounted them and work. Now I would like to connect them in series to use them as a dual power supply.

The only problem is that I don't know if with this kit the units will blow up.
Below you can find the circuit diagram of the hiland kit

And this is the link of the product. I'm sure more than one person here knows this kit. https://www.banggood.com/0-30V-2mA-3A-Adjustable-DC-Regulated-Power-Supply-Module-DIY-Kit-p-958308.html?rmmds=search

Should I be worried when connecting the supplies in series?
Other products like the DPS and RD series don't allow connection in series or parallel, as stated by the designer.

Does anybody know an affordable adjustable symmetric power supply?

thanks in advance.
 

Offline not1xor1

  • Frequent Contributor
  • **
  • Posts: 716
  • Country: it
Re: Hiland kit for dual/symmetric bench power supply?
« Reply #1 on: December 24, 2019, 07:01:42 am »
D11 should allow serial connection, but that circuit is really bad and unreliable.
There are other threads dealing with that and suggesting possible improvements.
Just use the search function of the forum.
 

Online Kleinstein

  • Super Contributor
  • ***
  • Posts: 15154
  • Country: de
Re: Hiland kit for dual/symmetric bench power supply?
« Reply #2 on: December 26, 2019, 10:20:34 am »
That kit has quite some weak points. The main problem with the circuit is that the OPs are operated way beyond there rated voltage  :-- :wtf:. So there is a good chance they will blow up and the supply could than deliver full voltage or current.  So even if it works now, it is not reliable.

The easy to fix part is increasing R18, so that the maximum current is reduced to a safer 1-2 A level.
The other point is using OPs that can stand the voltage - even if just 741s, like in the original version of this circuit.

If used in series D11 should be powerful enough to carry the full current, possibly more. So it should be more like a 3 A diode like 1N5401.
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf