I had a Wall Wart for my Yaesu that went missing, It was a 12Volt DC 2amps.
So after much searching :
I tried 3 others, First one was a wall wart switcher BIG MISTAKE inside was one cap for DC Filtering rated for 3 amps.
Second one was a Ritz Power supply, hooked up a speaker and lots of hum that was noticeable. So I decided to test further, opened the case, Had a huge Transformer, Bridge rectifier, two large Capacitor's, on/off switch, with pilot light.
Its output was labeled as "Magnetic Regulated
" 13.8 VDC 8AMP. POWER SUPPLY.
So I asked for some Help on how this worked, most of my Ham buddies didn't have a clue.
But one of them had a slight understanding of how it was used. The term H e used was that it had a Ferro-Magnetic Transformer for regulation. Of the two caps, one is installed across one winding, its a bathtub style non-polarized cap.
This cap has to due with reducing the saturation level of the transformer. It is used mainly in industrial settings.
So it seems to regulate, but with the remaining electrolytic cap it has at least 2 Vpp of ripple, which isn't good for solid-state radios.
So that one was also set aside. I did a lot of looking at small cheap power supplies, and most wont declare what the noise and ripple figures are. So I went back to my friend and told Him my situation, and He said He might have something that may work.
Well bless His Heart, He did have one that I could use. It is made and sold by POWER-ONE. It is a discontinued model, but the still make almost the same one as my new used one. ---> [You must be registered and logged in to see this link.]
I recommend this one.
It puts out 15 Volts DC, has a pot adjustment for voltage +/- 5% ( I set that to 13.3 VDC) Regulates ripple and noise to 5mV. WOW what a GEM.
New they sell for ~$40, boy that's a lot less than $70 for a replacement wall wart from Yaesu.
It has a 2 amp fuse on the DC side, I need to install one of maybe .25 amps on the input of the unit. Add a box, switch, LED for power indication and I am set. It is called an open frame power supply. I now will use this, as my Yaesu Power source.
I did some research on how to test power supplies, and gained some useful knowledge.
The final thought is you cannot just slap any available power supply
into use without knowing specifications, as you might find out the hard way, that an expensive piece of Equipment my fry on you for lack of knowledge.