MCM Electronics

Multi Voltage Regulated Power SupplyMCM Part #: 28-2200  |  Distributed By MCM Part #: MW122A

Multi Voltage Regulated Power Supply 4.7 stars from 9 reviews.
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  • Ideal for any device drawing up to 2A
  • Fully regulated to deliver constant DC power
  • Rotary selector switch selects 3, 41/2, 6, 71/2, 9 and 12V
  • Power projects or small battery operated devices
  • Color coded binding posts makes connection easy
  • Ultra-compact, lightweight design
  • Power on LED indicator
  • Dimensions: 5 3/16" (L) x 2 5/8" (H) x 3 7/8" (W)

  • Product Reviews

    • "Exhibit Fabricator" by dewddiact on 10/12/2012
      Overall: 5 out of 5

      Excellent versatility for the money. I use these frequently for power supplies in projects. The choice of voltages allows me to power nearly a whole exhibit with power to spare and reliability far exceeds the normal "Wall Wart" that I may have used instead.

    • "home owner" by eppy47 on 6/4/2012
      Overall: 5 out of 5

      The voltage power supply look great thanks for the fast shipment.

    • "Low Cost Power Supply" by mcmJames on 8/13/2011
      Overall: 3 out of 5

      The problems: 1. The jacks are a non-standard spacing, too close together for use of a dual banana plug. 2. The switch uses the p.c. board for the stationary switch contacts. This works fine for switching the transformer taps, but contact resistance in the feedback resistor path can result in the 3 volt output being 10% high. Contact cleaner/lubricant on the p.c. board contacts helps. The pluses: The multiple taps on the transformer keep the power dissipation low.

    • "How to add a 5V 2A output capability:" by marshallf3 on 5/3/2011
      Overall: 4.5 out of 5

      Add a LM7805ACT or MC7805ACTG regulator IC internally. (with the proper 0.33uf input leg cap and 0.1 uF output lleg bypass caps along with at least a 470 uF filter electrolytic on the output leg) IT HAS TO BE an ACT or ACTG component, they're the only ones that will handle 2.2A given a large enough heat sink. Since the IC drops about 2V internally you'll need to give it at least a 7.5V input. NOW, drill a small hole for a mini SPDT rocker switch, center leg to the red binding post, one outside leg to the wire that was originally going there and the other to the output of the 5V regulator IC. You now have the capability of using it as it was with the rotary switch or switching it to a solid 5V 2A output.

    • "Great product" by Mr.Remote on 3/14/2011
      Overall: 5 out of 5

      Great for running cooling fans in AV applications where noise is a factor.

    • "Quality" by AdvDecInc on 3/8/2011
      Overall: 5 out of 5

      I have used several of these units and all are working great. I even have had one working 24/7 for several years now.

    • "Solid, reliable power for small projects" by tunagrande on 3/3/2011
      Overall: 4.5 out of 5

      This unit is not one of the fancy switching supplys that are so light and tiny, it actually has a real live transformer in it ! I've used it on a half-dozen projects and it has performed perfectly. The only thing I wish it had was a 5V position.

    • "2A variable power supply" by 89shoyamaha on 2/13/2011
      Overall: 5 out of 5

      Wow, I bought one of these when I was in high school and it stills works great!!! Class of '95!!

    • "Works Great..." by installpro on 5/15/2009
      Overall: 5 out of 5
      Top 10 Contributor

      I have used several of these over the years. One is on my bench, as a temporary battery eliminator, several others are are permanently in use on various items. All have been 100% reliable.

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    Package Specifications & Dimensions
    Weight:3.032 lbs.
    Warranty:90 days
    Need to Return?
    Length:7.45 in.
    Width:5 in.
    Height:6 in.
    Shipping Information
    Extra Shipping Charge:No
    Drop Ship:No
    Catalog Pages

    MCM Cat 57, Page 828

    MCM Cat 56, Page 739

    Mfr. Info

    Distributed By MCM Logo
    Mfr. Name:Distributed By MCM
    Mfr. Part Number:MW122A