# Urgent- It this simple circuit will work?

Discussion in 'The Projects Forum' started by studystudystudy, Nov 23, 2010.

1. ### studystudystudy Thread Starter Member

May 21, 2010
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to all, audioguru, kubeek

it this circuit will work? will this V2 voltage and current flow back to V1?

2. ### mik3 Senior Member

Feb 4, 2008
4,846
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Something is missing.

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3. ### blueroomelectronics AAC Fanatic!

Jul 22, 2007
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Well if you want to make the supercap catch fire it's a fine circuit.

You really can't have such a wide input voltage range.

Why start a new thread on the same problem?

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4. ### studystudystudy Thread Starter Member

May 21, 2010
34
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thanks for your post. what do you mean by make supercap catch fire and can't have such a wide input voltage range?

i have to start a new thread because old 1 no people reply me.

my circuit is to stored the energy, Energy harvesting circuit, the input source are unstable or no constant... if my V2 and I2 is conduct, will it send back to V1 and I2?

5. ### blueroomelectronics AAC Fanatic!

Jul 22, 2007
1,758
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Appears you've been trying to figure this out since May 2010. You might want to wrap your head around basic electronics first so you can see why this is not a viable circuit.

What are the sources of electricity? What are you storing the energy for? What do you hope to power? Supercaps don't hold that much power compared to a battery.

PS how on earth can it be urgent?

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6. ### studystudystudy Thread Starter Member

May 21, 2010
34
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to blueroomelectronic

yes, u r right, i try to figure it out since may 2010, but this is urgent where i have to submit already

i study all the necessary component. but i still don't even know how to start to design a circuit. Design a circuit need consider many thing.. leakage current etc. which is i not good enough

the source : piezoelectric material - when compress, a small current flow
Purpose : just stored the charge to power a LED (main purpose to stored only)

Voltage source around Vpp 80V and Current source around 25uA

7. ### blueroomelectronics AAC Fanatic!

Jul 22, 2007
1,758
98
You don't appear to have taken the time to understand basic electricity. Do you understand the simple formula E=IR?

I urgently suggest you hit the coursebooks.

Last edited: Nov 24, 2010
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8. ### THE_RB AAC Fanatic!

Feb 11, 2008
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How ironic that the OP's name is "Studystudystudy"...

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9. ### studystudystudy Thread Starter Member

May 21, 2010
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thank for all your post. even it not related

i admit i didn't do my part as a student rightly... but isn't it when i found problem, i come here to seek for professional?

i admit its already long time story.. but once you don't know how to do it, and you try hard, still cannot get it... should i seek for other for help?

10. ### tom66 Senior Member

May 9, 2009
2,613
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If it works, it will be terribly inefficient, like 5% at best. And it won't take in much energy on each pulse.

Also, remove ZD1, it has no function in this circuit.

Last edited: Nov 24, 2010
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11. ### Potato Pudding Well-Known Member

Jun 11, 2010
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Actually removing that ZD1 forward biased zener is also important because it pushes the properly biased Zener up to 5.1 + 0.7 volts. That means that the super cap could get overcharged to 5.8Volts which is bad if it is rated at 5.5 Volts. That only matters if you have a very energetic piezo system which I doubt. You would be talking about serious piezo stacks fed by an extremely high vibration energy. It would not be efficient.

After that your little circuit should be fairly harmless and might even work. I wouldn't bother with a large value capacitor because you will be unlikely to get it even close to charged. What you want are some 1uF low leakage ceramic capacitors.

What you are describing is far from new.

I believe it is similar to what is inside those kids sneakers that light up with every step.

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12. ### tom66 Senior Member

May 9, 2009
2,613
215
Why not just use one of these? Far more efficient and even has part numbers on the example circuit.

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13. ### studystudystudy Thread Starter Member

May 21, 2010
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so i have to remove the ZD1?

14. ### blueroomelectronics AAC Fanatic!

Jul 22, 2007
1,758
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Makes no difference, the circuit is light years away from doing anything like what you want.

You should study study study why the circuit (which is little more than a pair of bridge rectifiers) won't work. Only then do you have any chance of figuring out it's err limitations.