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Minute Man Electronics

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Introduction to a Power SupplyIntroduction to a Power Supply
Philmore DATAKit # 80-040

A practical battery eliminator for circuit projects at the bench.

This is a basic power supply using two IC’s (7805) regulators. User needs to supply a transformer up to 20V AC for input (we suggest scrounging from old radio or surplus catalog). Outputs are regulated, one variable up to 28 volts and one constant 5V DC. A good introduction to power supplies.

We suggest you also order a soldering tool kit to make this project. Click here to go to this item (# S540).

 Click Here For Picture Of Soldering Kit # S540.


Price:  $27.84 


Positive Adjustable Power Supply Kit
Philmore DATAKit # 80-124

This is a well regulated and adjustable DC power supply with a positive output voltage of 3 to 37 volts and an operating current of up to 1.5 amps.

The input needs to be 3 Volts or higher than the output voltage and can be from either a DC or AC voltage source. You can use a transformer with either a single secondary winding or one with a center-tap.

These two kits (80-124 and 80-125 see kit below) can be used separately or assembled together to create a dual rail power supply.

Feature:

  • Output reverse polarity and back-voltage protection
  • LED power on indication
  • On board heatsink for IC regulator
  • Variable output voltage
  • AC or DC input voltage
  • Low noise (uses linear regulator)
  • Screw terminal for input, output, and LED indicator
  • Compact dimensions (84mm x 37mm)

Complete details for transfomer selection are included. You supply the transformer (see our power transformers), and make sure that the tranformer output voltage is 3 volts higher than the desired output voltage.

 


Price:  $25.12 

Positive Adjustable Power Supply Kit


78XX Regulated Power Supply Kit78XX Regulated Power Supply Kit
Philmore DATAKit # 80-600

This circuit can be made into a regulated power supply for voltages from five volts up to twenty-four volts.The user must add any of the standard 78xx TO-220 positive regulators 7805 or 7806 or etc...thru 7824) and the voltage will equal which ever part you select (the last two digits of the number indicates voltage; 705 = five volts etc.).

Input AC or DC (unregulated) about three volts greater then the desired output voltage, complete instructions included.

The 7800 series outputs up to one ampere typically. LED indicator and on-board on/off switch.

You could use this with a junk box AC or DC power supply or supply your own transformer etc..

Includes components, but picture shows PCB without components. 


Price:  $19.32 


Variable Power Supply
Philmore DATAKit # 80-680

A very basic power supply that can be adjusted over a range of about 1.5 to 35 volts DC. If you add a heat sink (included), you can run it "hot" at 2 amps output; otherwise about 60mA @12 volts. This is a text book circuit using an LM317, which is a 3 terminal regulator in a TO-220 package.

Input can be either AC or DC; DC input must be at least 2.5V above the required output voltage.

Picture shows PC board included in this kit.

We suggest you also order a soldering tool kit to make this project. Click here to go to this item (# S540).

 Click Here For Picture Of Soldering Kit # S540.


Price:  $24.34 

Variable Power Supply


Variable Power SupplyVariable Power Supply
Philmore DATAKit # 80-970

The kit comes "complete", which means the transformer, power cord and fuse holder are included. Most power supply kits leave finding such things to the builder.

Output is via screw terminals, making this a good bench supply for the kit builder. Voltage may be varied up to about 24 volts DC and is well regulated; i.e. the voltage is very stable.

Using the LM317T I.C. and the included 24 volt, 1 amp transformer permits an output range from about a volt to 21 volts. Higher current is available at the higher voltages but lower voltage are at lower currents; for example, around 5 volts the maximum output is around 350 mA. Maximum current is available in the 18 to 22 volt range .

Ripple (on line noise) is finite, making this a good kit for those audio and R.F. projects where you do not care to hear power line noise.

Note: We do not recommend a beginner build this kit unless he or she has some experienced supervision to help. Any kit that connects to the A.C. power line is potentially dangerous to the inexperienced builder.

We suggest you also order a soldering tool kit to make this project. Click here to go to this item (# S540).

 Click Here For Picture Of Soldering Kit # S540.


Price:  $30.49 

Minute Man Electronics

Unique Products and Components
$20 Minimum
Merchandise Order
Thank You