Power Supply - Analog Triple Output DC 30V/3A

Replacement: None. We do not have a direct replacement for this unit. This page is for reference only.

This is a high quality adjustable 30V/3A power supply with fixed 5V and 12V output and analog display. Takes a 100-240VAC, 50/60Hz.

We’ve played with many bench power supplies and worked with many suppliers. We found that too many suppliers were cutting things just a bit too close with quality and engineering. These units are high quality and should last for years. We use this supplier for our power supplies in SparkFun production.

  • 3 selectable output ranges: 0 to 30V/0 to 3A; 5V/1A; 12V/1A
  • Analog display
  • Adjustable Voltage and Current output
  • Easy snap terminals for fixed 5V/0.5A and 12V/1A outputs
  • Constant Voltage or Current
  • Current limiting indicator
  • Overload and short circuit protection
  • Binding post terminals for variable supply
  • AC power cord with US prongs

Customer Comments

  • Good to see your carrying good benchtop power supplies and I’m also unsurprised it’s from Extech. I have a few of their products and really like them.
    I’ve thought of buying a good bench supply for quite some time, but most of the time I end up using a switching wall wart instead. A bench supply is great if you need adjustable voltage or current limiting, but when it comes to the best bang for your buck, having a collection of switching wall warts in a wide variety of voltages is very practical. Besides that, I think adjustable current limiting is a good analog electrical design exercise, too.

  • The first bullet lists 5V/1A and the 4th bullet lists 5V/.5A, something’s not quite right.

  • Triple output here is +5/+12/+0-30?
    I keep looking at these hoping to find a bipolar supply suitable for opamps and the like.

    • Not that Sparkfun carries it, but I’m looking at the BK precision 1550 which is available from a number of reputable retailers for about the same price and is bipolar.
      It’s a digital single output.
      My experience with BK is that they work pretty well, but I’ve only used 2 of them in the past.

    • I’m not a fan of using a resistor divider and decoupler either. Although, it has been quite handy in a pinch before.

      • Try making a rail divider. I didn’t know what they were called until I made one myself. Then when I had figured it out I found out it was a common circuit called a rail divider. The components are simple: opamp, matched npn and pnp transistors, diode (not needed really), resistor (if using diode), a couple of caps, and a couple high ohm resistors to give e ref to the opamp. Once put together you can divide any voltage to the limit of the opamp, and current is limited by the transistors. You might even be able to use mosfets instead.
        The circuit just tracks midway between positive and negative and gets feedback from the output of the push pull transistors. It is kind of fun to get working. I used it to power a another opamp with push pull to control ac current. The supply was about 30V.

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