Originally Posted by CitiBear
It would be really helpful if you could expand a bit on your preference for the switched power adapters. As it happens, Cyclone82 has another concurrent thread about a similar adapter question for an MV filter that normally runs on a 9v battery. In a reply to that thread, rkg22
said he felt the switched adapters were more prone to interference:
If you have used both types of wall wart in your video work, morc258, any comparative info you could share would be much appreciated: I just checked my own TBC1000 PSU, and its the older iron-core 1200mA version. If Cyclone82 is correct about the DataVideo performing better with a 1500mA PSU, I might jump on one, but your further perspective on potential noise or interference issues would be reassuring.
I can not attest to this particular piece of equipment, but based on the manufactures own findings, this type of power supply has no adverse effects on the performance.
rkg22 is correct in that there is the possibility of having extra EMI on some switch mode power supplies especially on early tech or non-isolated styles.
I took apart three phone chargers today and all of them were isolated style with HF transformers. All of the other larger (higher current) models I have opened were also of the isolated variety. The type rkg22 is warning to stay away from do not have the transformer, therefore they are not isolating the primary and secondary which is not desirable.
Here is a example of the "non regulation" of the typical old style wall wart:
I took two power supplies, both equal in output voltage and current ratings,1000mA @ 12VDC. One was old transformer style, the other was new switching style. With no load, the old PS was pumping out 17.8V. The new one, 12.36V. When measuring AC component on the DC output, the old was 2.4mV and the newer was 4.0mV. The old one has no control over voltage fluctuations on the input, or current fluctuations on the output (which influence the voltage level). If you have a surge, the output potential will rise, if you have a dip, the output will fall.(this is a typical old style wall wart)
The switching power supply can compensate for these variables as long as they are within the rated specs. Voltage and current output will be pretty rock solid independent of the fluctuations.
The AC leakage to the DC output was a tad higher on the newer supply, but not that much. That and other EMI might have an undesirable effect in older analog equipment. That may come down to good ol' trial and error. I personally no longer have any analog equipment, so I can't offer any real world test scenarios. I know, speculation doesn't mean squat. Until you try it, you will not know for sure.
I have made a conscious effort to change every power supply in the house to switching style and thankfully, all newer equipment I buy has them already.Regulations
on external power supplies has been tightened up to a point where switching power supplies are the only current way to achieve compliance.
Interesting point of note, B&H says the TBC-1000 will run on 5-12V here
Datavideo says :12V 1A DC 110 power supply (220 volt power supply available as a special order) here
under full specifications.
The product manual says DC 9V 1A here
I would definitely stick with 12V, but looks like it's capable of running at lower voltage?
As far as these units running better at 1.5A, maybe older units had more power requirement? It is always better to have more current capacity than needed (within reason), so the power supply won't have to work so hard.