Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
10-12-2013, 02:18 AM   #1
Inactive Account

Join Date: Sep 2013
Posts: 9
K-m power supply

I'm no electrician or electronics buff, but I am trying to make an ac adapter power supply for my K-m, sometimes referred to as a battery eliminator.
I have sourced the two AAA - AA battery containers to fit things into, but can't put my finger on the exact amount of Volts and max amps I should be heading for, or indeed a low cost power supply unit to use for this.
Any idea on safe tolerances for the amps? I suspect 2 amps would be fine with 5.5V supply, but that is more guess work than informed thinking

Many thanks

10-12-2013, 06:11 AM   #2
Inactive Account

Join Date: Dec 2008
Location: North Carolina
Photos: Albums
Posts: 1,720
The official one is 6.5V and 3A.
10-12-2013, 07:59 AM   #3
Site Supporter
JimJohnson's Avatar

Join Date: Jan 2012
Location: Lake Superior - Michigan
Photos: Gallery
Posts: 2,271
QuoteOriginally posted by elliott Quote
The official one is 6.5V and 3A.
Let's use this as a start. Voltage is the amount of electric pressure in a circuit. 4 AA batteries in series will put out about 4.8 to 6 volts when fresh, depending on the chemistry involved, and the voltage falls slightly as the batteries are used. So 6.5 VDC (volts direct current) reflects the high end of those values. I would suggest that a power supply with an output between 6.0 and 6.5 VDC will do the job.

Amperage is the amount of current available. That last word is important. The official power supply can supply upto 3A (amps). It does not mean the camera's circuit uses 3A continuously. It uses only as much current as needed for the current operation. To play it safe, the power supply for this project should support output of at least 3A. Greater than 3A won't hurt anything; it just means the power supply won't work as hard.

If you want to see how I tackled this project for the K-r, K-30, K-50 or K-500, check out this DIY article:
10-12-2013, 12:48 PM   #4
Inactive Account

Join Date: Sep 2013
Posts: 9
Original Poster
Many thanks guys. I am sure with your contribution I can crack this with alot more confidence. JIm many thanks for clearing that up for me, very well explained!


  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
battery, camera, k-m, pentax help, photography, power
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
External power supply mattv Pentax K-5 12 12-22-2012 07:35 PM
DIY K-5 Power Supply from 12V battery atnbirdie Pentax K-5 19 12-14-2012 10:18 AM
Lester Dine ring flash battery / ac adapter / power supply BradleyS Pentax Camera and Field Accessories 10 07-26-2012 02:17 PM
K-5 power supply orangezorki Pentax K-5 7 04-19-2012 04:49 PM
Charger/Power Supply jnorth Pentax DSLR Discussion 15 01-07-2007 10:47 AM

All times are GMT -7. The time now is 12:25 PM. | See also:, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]