[bertwert]

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I was wanting to get an AC adapter for my K-50.
Will one of these cheap ones from ebay work?
K AC128 AC Adapter D AC128 D DC128 DC Coupler FOR Pentax K 30 K 50 K S1 K 500 | eBay
AC Power Adapter AND DC Coupler FOR Pentax K AC109 K Series SLR Digital Camera | eBay
HQRP AC Power Adapter FOR Pentax K 30 K 50 K 500 D AC128 D DC128 D AC50 D DC109 | eBay

[Steve.Ledger]

I wouldn't trust them. You'd void any wty you still have and potentially fry your K-50.
For just $89 from B&H the genuine part would be a better and safer buy.

[KDD]

Pentax K-AC128 AC Adapter Kit for K-30 Digital Cameras 38823 B&H

[Spodeworld]

AC adapters are pretty simple to make. Do you have any reason to think an off brand would be so risky?

[Not a Number]

I got a used Pentax one from KEH in EX+ condition for $10-12.

While they are fairly simple to make a lot depends on the quality of the components which affects the quality of the output. If it drifts too far out of the specs it could cause problems.

Here are some DIY instruction with parts list if you want to make your own. The adapter for the K10D/K20D is works with all the other bodies - the power connector being the a possible incompatibility.

https://roamingdrone.wordpress.com/2008/09/26/diy-ac-adaptor-for-the-pentax-k10d/