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Registered Member #3781
Joined: Sat Mar 26 2011, 02:25AM
Location:
Posts: 701
Ah this is probably not very complicated but I'm having trouble finding the answer on the internet. I need to convert the AC voltage from a US outlet (~115v) to a voltage between 100 and 200 vdc. The reason being is that I'm making a plasma speaker and am in need of a high DC voltage that will feed the primary coil. There can be a little noise on the line but I would rather not have any big spikes.
I'm not quite sure how I should go about doing this.
If you want isolation from the mains which I would recommend you could try the transformer out of an (old) tv the ones I have have an output of around 100-110v and that would also give you some current limiting I don't now what the newer tv smps put out but one might work
Registered Member #3781
Joined: Sat Mar 26 2011, 02:25AM
Location:
Posts: 701
Destroyer of mosfets wrote ...
If you want isolation from the mains which I would recommend you could try the transformer out of an (old) tv the ones I have have an output of around 100-110v and that would also give you some current limiting I don't now what the newer tv smps put out but one might work
Alright, thanks for the suggestion! I've got a few 1:1 transformers lying around but i'll check my TV boards.
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
CTR TVs and monitors usually have a power supply with many outputs that you can just cut out of the board and use, but of course you must be able to read the schematic and understand what you are doing. No modern TV (last 30 years at least) uses 60 Hz transformers. A transformer with dual input, as 110/220 V can be used as an isolation transformer if there are two separate windings to be connected in series or in parallel. Just use one as input and the other as output. The regular output windings can be used too to generate other voltages.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
The isolation is usually not needed if you don't want to mess with a scope on the power part running, which I don't recommend anyway... Use a NTC, a bridge rectifier and a filter capacitor, you wil end up with approx. 160-170 Vdc.
You can of course just use a regular isolation transformer bridge rectified for 170vdc. Or if you want it to be variable, use a smps.[/quote1339120305]
Variacs are simple and allow you to control the voltage, whats not to like?
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AC to DC Conversion
