Reducing Current/Amperage from a Variable Voltage PSU

Hello,

I'd like to introduce myself in my first post as well as ask some questions. I am fairly new to electronics and have been learning on and off now for the past 4 years or so. I've amassed a fairly good sized inventory of parts and pieces, but need some help with a particular new acquisition of mine; a variable rate PSU.

The PSU I have is almost identical to this model.

My problem lies with the fact that while the output voltage for the PSU can be adjusted, the amperage cannot. Thus, it constantly supplies 2 amps and fries the majority of my electronics projects. I would like to know how best to reduce the amperage output of the unit. What would the ideal rating be for PID or arduino projects? Thus far I have gone through 3 resistors; up in smoke. Any help would be greatly appreciated.

by E-Lectro
November 11, 2018
Add comment...

Please sign in or create an account to comment.


2 Answers

Answer by Abril_electronica

Hola soy nueva en esto me podrían ayudar tengo que hacer un diagrama para medir amperios empleando amperímetro y para voltios utilizando voltímetro

+1 vote
by Abril_electronica
November 11, 2018

https://www.circuitlab.com/circuit/37w3g2hjnp4v/21-voltmeter-ammeter/

by mikerogerswsm
November 11, 2018

Translation:

Hi, I'm new in this, you could help me, I have to make a diagram to measure amperes using an ammeter and for volts using a voltmeter

by mikerogerswsm
November 17, 2018
Add comment...

Please sign in or create an account to comment.


Answer by mikerogerswsm

The supply produces a constant voltage. The current is whatever your circuit needs, up to the supply limit of 2A.

So for example if you set 6V and apply a resistor of 500 ohms it will take 6V divided by 500 ohms or 12 mA and the power will be 6V squared divided by 500 ohms or 72 mW.

See https://en.wikipedia.org/wiki/Ohm%27s_law and http://www.sengpielaudio.com/calculator-ohm.htm

+1 vote
by mikerogerswsm
November 11, 2018

ps - Your Arduino needs to be powered from seven to twelve volts at Vin so the setting of your supply should be 7.5V, 9V or 12V. Probably best to go for 7.5V.

by mikerogerswsm
November 11, 2018
Add comment...

Please sign in or create an account to comment.


Your Answer

You must log in or create an account (free!) to answer a question.

Log in Create an account


Go Ad-Free. Activate your CircuitLab membership. No more ads. Save unlimited circuits. Run unlimited simulations.

Search Questions & Answers


Ask a Question

Anyone can ask a question.

Did you already search (see above) to see if a similar question has already been answered? If you can't find the answer, you may ask a question.


About This Site

CircuitLab's Q&A site is a FREE questions and answers forum for electronics and electrical engineering students, hobbyists, and professionals.

We encourage you to use our built-in schematic & simulation software to add more detail to your questions and answers.

Acceptable Questions:

  • Concept or theory questions
  • Practical engineering questions
  • “Homework” questions
  • Software/hardware intersection
  • Best practices
  • Design choices & component selection
  • Troubleshooting

Unacceptable Questions:

  • Non-English language content
  • Non-question discussion
  • Non-electronics questions
  • Vendor-specific topics
  • Pure software questions
  • CircuitLab software support

Please respect that there are both seasoned experts and total newbies here: please be nice, be constructive, and be specific!

About CircuitLab

CircuitLab is an in-browser schematic capture and circuit simulation software tool to help you rapidly design and analyze analog and digital electronics systems.