Greetings from yet another new guy,
I have a curiosity question regarding some wall wart transformers. Here's hoping the following narrative won't put any would-be readers to sleep.
I have in my possession an AC to DC adaptor wherein two of the four full wave bridge rectifying diodes on the secondary side are fried, and the transformer has no longer has power going through it. It seems there was a short in the secondary plug end that goes into the device to be powered that caused the diodes to burn up and the transformer to fail. I discovered the secondary was not open, but the primary was indeed open. So I began to peel back some of the tape covering the primary windings in an effort to expose said windings in hopes of discovering a burn through without too much digging. However, I didn't get very far before I discovered a tiny electronic component. At that point, I tested the continuity of the primary windings downstream of this component, and found them closed (yay!).
Of course, this now reveals the question: what IS this mystery component? I presume it is some sort of fuse, but wondered if it were something else, like a filter.
The size of this rectilinear component is 7/32" x 9/32" x 3/32", and the markings are:
M30
TF 125ºC
10C
There are two leads which come from one side (a 3/32" edge), which threw me, making me think it might be a film cap.
Particulars for the wall wart are:
Input: 120V AC 60Hz 14W
Output: 9V DC 1000mA MAX.
Plug: S5.5x2.1mm (center bore is positive, outer shell is negative)
Other info:
Diodes are IN4001's
1000 uF, 25V electrolytic Cap on the secondary side
I had come across this sort of thing before on another adaptor, and bypassed the apparently nonfunctioning component to see if the adaptor would work. It did. However, I still replaced the entire adaptor because I didn't know what part the mystery component played in the grand scheme of things. Now that I've come across this mysterious component again, I figured it would be good to know what it is. If it is a fuse, how do I go about finding a replacement? O.K., so that was more than one question.
Thanks in advance,
Mark
I have a curiosity question regarding some wall wart transformers. Here's hoping the following narrative won't put any would-be readers to sleep.
I have in my possession an AC to DC adaptor wherein two of the four full wave bridge rectifying diodes on the secondary side are fried, and the transformer has no longer has power going through it. It seems there was a short in the secondary plug end that goes into the device to be powered that caused the diodes to burn up and the transformer to fail. I discovered the secondary was not open, but the primary was indeed open. So I began to peel back some of the tape covering the primary windings in an effort to expose said windings in hopes of discovering a burn through without too much digging. However, I didn't get very far before I discovered a tiny electronic component. At that point, I tested the continuity of the primary windings downstream of this component, and found them closed (yay!).
Of course, this now reveals the question: what IS this mystery component? I presume it is some sort of fuse, but wondered if it were something else, like a filter.
The size of this rectilinear component is 7/32" x 9/32" x 3/32", and the markings are:
M30
TF 125ºC
10C
There are two leads which come from one side (a 3/32" edge), which threw me, making me think it might be a film cap.
Particulars for the wall wart are:
Input: 120V AC 60Hz 14W
Output: 9V DC 1000mA MAX.
Plug: S5.5x2.1mm (center bore is positive, outer shell is negative)
Other info:
Diodes are IN4001's
1000 uF, 25V electrolytic Cap on the secondary side
I had come across this sort of thing before on another adaptor, and bypassed the apparently nonfunctioning component to see if the adaptor would work. It did. However, I still replaced the entire adaptor because I didn't know what part the mystery component played in the grand scheme of things. Now that I've come across this mysterious component again, I figured it would be good to know what it is. If it is a fuse, how do I go about finding a replacement? O.K., so that was more than one question.
Thanks in advance,
Mark