Tagged Questions
10
votes
3answers
625 views
Cellphone charger has no transformer?
I opened up a really tiny mobile phone charger I have, to see how it is designed. The entire "charger" is integrated into a small 2-pin mains plug, 1 x 1.25 x 0.5 inch, that has an USB socket for the ...
1
vote
2answers
260 views
Isolation transformer weirdness
I recently posted a question about cutting the ground wire in an isolation transformer to make it truly isolated. After reading the responses, I decided the best advice was to reconnect the ground ...
5
votes
3answers
367 views
Cutting the ground wire in an isolation transformer?
I bought a non-tech isolation transformer (500w), which I planned to cut the earth mains ground from the output, but leave the chassis grounded; however, when I opened it up I found the output outlets ...
1
vote
1answer
235 views
How close can I place two transformers?
I need to place two of these transformers in a case. How close am I allowed to place them? Can they touch each other (of course, they will be electrically isolated)? Is their orientation with ...
4
votes
2answers
610 views
Isolation transformer and scope when troubleshooting SMPS
I have a simple question, when troubleshooting a SMPS is highly adviced to use an Isolation transformer. But my question is this, if im using a scope to troubleshoot the "hot" side of my SMPS, both ...
7
votes
2answers
217 views
Isolation transformer to reduce speaker pop
I have some computer speakers which suffer from the following problem:
when switches flip in certain devices in the house, like the thermostat on a radiator or the refrigerator, the speakers will emit ...
5
votes
2answers
615 views
Isolation Transformer
When a function generator is used to power a full wave rectifier an oscilloscope will not show the correct output due to a shared ground. A half wave is displayed because one of the diodes is ...
3
votes
2answers
205 views
How to properly isolate multiple power supplies
Say you have a single 110V AC supply and need to use it for a number of devices, each requiring very different characterists. For me personally these are: a direct use of the 110V AC supply for a ...
4
votes
3answers
795 views
Why is power supply from electrical utility referenced to earth?
In response to the question Basic Training for working with 120V AC zebonaut had replied that "A regular wall outlet is referenced to earth" and this provides the close loop for the circuit to ...
