Author Topic: 8 volts AC to DC hack  (Read 3108 times)

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Offline J4e8a16n

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    • Jean Pierre Daviau
8 volts AC to DC hack
« on: January 09, 2014, 09:06:06 pm »
Hi,

Is it pössible to do something like that?


JP
Equipment Fluke, PSup..5-30V 3.4A, Owon SDS7102, Victor SGenerator,
Isn't this suppose to be a technical and exact science?
 

Offline Dave

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Re: 8 volts AC to DC hack
« Reply #1 on: January 09, 2014, 10:03:54 pm »
I'm confused. What exactly are you trying to accomplish here?
<fellbuendel> it's arduino, you're not supposed to know anything about what you're doing
<fellbuendel> if you knew, you wouldn't be using it
 

Offline filip_cro

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Re: 8 volts AC to DC hack
« Reply #2 on: January 09, 2014, 10:10:52 pm »
Are you trying to connect this into the mains?

AND redraw schematic !!!!!!!!!!!! You need 5 minutes just to figure out will rectifier work. It's totally unreadable.
« Last Edit: January 09, 2014, 10:14:21 pm by filip_cro »
 

Offline Matt_Heilman

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Re: 8 volts AC to DC hack
« Reply #3 on: January 09, 2014, 10:24:31 pm »
The peak inverse voltage of an LED is 5V, so you probably want to place that after the bridge rectifier.
 

Offline TerminalJack505

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Re: 8 volts AC to DC hack
« Reply #4 on: January 09, 2014, 10:40:23 pm »
It looks like you're trying to implement a capacitive power supply.  If that's what you're really trying to do then--now that you know the name of the design pattern--you can do some more research.  I've never played with that particular circuit since I like to avoid mains voltages so I can't really give you any further advice. 
 

Offline filip_cro

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Re: 8 volts AC to DC hack
« Reply #5 on: January 09, 2014, 10:57:42 pm »
It looks like you're trying to implement a capacitive power supply.  If that's what you're really trying to do then--now that you know the name of the design pattern--you can do some more research.  I've never played with that particular circuit since I like to avoid mains voltages so I can't really give you any further advice.
Probably, but he did everything wrong. For example rectifier after LE diode, 120 peak voltage (should be 120 * sqrt(2) ) ...
 

Offline J4e8a16n

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Re: 8 volts AC to DC hack
« Reply #6 on: January 09, 2014, 11:54:27 pm »
It looks like you're trying to implement a capacitive power supply.  If that's what you're really trying to do then--now that you know the name of the design pattern--you can do some more research.  I've never played with that particular circuit since I like to avoid mains voltages so I can't really give you any further advice.

Thanks
Equipment Fluke, PSup..5-30V 3.4A, Owon SDS7102, Victor SGenerator,
Isn't this suppose to be a technical and exact science?
 

Offline Psi

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Re: 8 volts AC to DC hack
« Reply #7 on: January 10, 2014, 02:24:10 am »
If making a capacitive powersupply for the first time i highly recommend you use one of the designs that has the output negative at earth potential and not floating.
Greek letter 'Psi' (not Pounds per Square Inch)
 

Offline digsys

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Re: 8 volts AC to DC hack
« Reply #8 on: January 10, 2014, 03:20:39 am »
Quote from: Psi
If making a capacitive powersupply for the first time i highly recommend you use one of the designs that has the output negative at earth potential and not floating. 
From the Wiki - ADD a C1//R2 in series with R1 as well !! Having a "hard ground" may trigger earth leakage, so usually people put
a 1M // 0.1uF from -ve to fake GND. NEVER tie it to REAL GND, as it is not isolated from the mains.
Hello <tap> <tap> .. is this thing on?
 

Offline J4e8a16n

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Re: 8 volts AC to DC hack
« Reply #9 on: January 10, 2014, 12:41:27 pm »
You mean that circuit?
Equipment Fluke, PSup..5-30V 3.4A, Owon SDS7102, Victor SGenerator,
Isn't this suppose to be a technical and exact science?
 

Offline digsys

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Re: 8 volts AC to DC hack
« Reply #10 on: January 10, 2014, 10:12:07 pm »
Quote from: J4e8a16n
  You mean that circuit? 
Yup. Having a capacitor on both A/N means that IF you ever plug into an incorrectly wired point, you won't get FRIED.
BUT, remember, it is still referenced to mains, so 0V is not a safety point ie I wouldn't have it exposed.
IF there is ANY chance of touching the OP, I'd add a 2nd protection device, either a say 18VAC MOV on the AC side of the bridge,
or a say 18VDC Transorb on the DC side of the bridge. If the secondary goes O/C, then you have the full AC on the OP.
Hello <tap> <tap> .. is this thing on?
 


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