Good Cheap Power Supply

Discussion in 'General Electronics Chat' started by Andrew216, Jan 20, 2016.

  1. Andrew216

    Thread Starter New Member

    Jun 24, 2015
    29
    2
    Can someone point me in the right direction for a good and cheap power supply? Short Circuit Protection and 3-12volts output are my only requirements. Some how tweezers keep ending up between the power and ground causing a short that almost caught fire today. Looking to avoid this in the future if these lines were to be accidently bridged again. Thank you!
     
    apsgamage likes this.
  2. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    4,770
    970
    Current requirements?
    Form factor (benchtop/openframe,etc...)?

    Amazon/Ebay has a ton of "off-brand" 0-30VDC supplies (typically 0-3A).. pick one.. they are all about the same..
    Here too..
    http://www.mpja.com/Benchtop-Power-Supplies/products/2/

    If you want "good" (quality/low ripple,etc...) I'd start looking at BK Precision,etc... from here or digikey or newark,etc..
    http://www.mouser.com/Power/Power-Supplies/Bench-Top-Power-Supplies/_/N-dqmv7

    I've been very happy with the
    BK Precision 1685B models I picked up but also have a "cheap" Protech 6003L that works just fine too.. BK is "higher quality"/quieter,etc...
     
  3. dl324

    Distinguished Member

    Mar 30, 2015
    3,243
    620
    Get a wall wart at a second hand store and build your own with an LM317.

    Regarding shorts - train yourself to be more careful.
     
  4. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,986
    745
    Use an atx psu, with a Lm2596 regulator,
     
    ISB123 likes this.
  5. visionelectronergy

    New Member

    Jan 14, 2016
    1
    0
    All power supplies have a power input, which receives energy from the energy source, and a power output that delivers energy to the load.A AC Power supply is the very good cheap power supply.
     
  6. wayneh

    Expert

    Sep 9, 2010
    12,123
    3,047
    Head to your local electronics recycling dump. You'll find all the old desktop towers you could want. Each one has a power supply that you can have for the "cost" of the effort to remove it. They're protected against overload and overheating and make for a very nice lab bench power supply.

    Laptop power bricks are darn nice and also readily available for free. They're typically smaller and quieter, with no fan. 19V and 3-6A. As noted, you can use a voltage regulator IC to control the voltage down.
     
  7. hp1729

    Well-Known Member

    Nov 23, 2015
    1,952
    219
    What do you consider cheap? 3 to 12 V, how much current?
    Personally I have a collection of wall wart power supplies I picked up at goodwill stores and flea markets for $1.00 or less each. I can throw together a cheap power supply for most projects.
    Only one bench supply? When it goes out how much of your work stops?
     
  8. Andrew216

    Thread Starter New Member

    Jun 24, 2015
    29
    2
    Right now we currently use a wall wart with the LM317 and a switch. The switch we use, in the up position, turns on an over head light for the operators while in the down position it will cut the over head light and deliver power to the UUT. This was the cheapest solution but now safety is an issue. We can only teach good/safe practices and hope the operators will follow. Has anyone had any experience with the Multi Voltage Regulated Power Supply MCM Part #28-2200?
     
  9. Techno Tronix

    Member

    Jan 10, 2015
    140
    10
    I preferred the quality than the cost. I use BK 1685B model for my power supply.
     
  10. hp1729

    Well-Known Member

    Nov 23, 2015
    1,952
    219
    NICE! It is hard to go wrong with good stuff if you can afford it.
     
  11. dannyf

    Well-Known Member

    Sep 13, 2015
    1,810
    362
    Take a laptop power supply (typically 16-20v) and put a 3-terminal regulator + pot on it and you got all you need.
     
  12. Dr.killjoy

    Well-Known Member

    Apr 28, 2013
    1,190
    156
    I would look into a Mastech power supply .. I have one and will post pics if requested but they are made pretty good for the average hobbyist..
     
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