How Do You Build and Safely Discharge a Capacitor Bank?

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Discussion Overview

The discussion revolves around the construction and safe discharge of a capacitor bank, focusing on wiring configurations, discharge mechanisms, and safety precautions. Participants share their experiences and seek clarification on specific methods for discharging capacitors effectively and safely.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about connecting capacitors in parallel and whether discharge terminals should also be connected in parallel.
  • Another participant confirms that capacitors should be connected in parallel and warns about the potential dangers of discharging them, suggesting a low charge voltage and a small number of capacitors for educational purposes.
  • A suggestion is made to use a high resistance resistor across the terminals to allow for slow discharge when disconnected, to prevent accidental shocks.
  • One participant shares a humorous anecdote about pranking new trainees with charged capacitors, while also seeking clarification on the intended use of a switch for discharging the capacitor bank.
  • There is a discussion about whether the switch should discharge the capacitors into a specific circuit in one burst or if it would simply short out the bank, with a warning that the latter is a bad idea.
  • A participant expresses an interest in creating a discharge mechanism similar to that used in flash cameras, involving a burst discharge from multiple capacitors.

Areas of Agreement / Disagreement

Participants generally agree on the need for caution when discharging capacitors and the importance of proper wiring. However, there are differing views on the specifics of using a switch for discharge, with some uncertainty about the intended application and safety implications.

Contextual Notes

Participants express varying levels of experience with capacitors, indicating that some may have limited knowledge about building capacitor banks specifically. There are also references to safety regulations that impact workplace practices.

Who May Find This Useful

This discussion may be useful for individuals interested in electronics, particularly those looking to build capacitor banks or understand the safety considerations involved in working with capacitors.

Learnphysics
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I'm thinking of building a Capacitor bank.I'm here to confirm that i just connect the capacitors in parallel with each other? Do i put the discharge terminals in parallel too, just like any other circuit?

How would i go about adding a feature to discharge all capacitors simultaneously? (by means of a switch).

Forgive my newbie questions, I've never built one of these before, and my knowledge of Capacitors is geared towards rectification circuits rather than build banks with them.
 
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Yup..."bank" means put'em all in parallel. Once wired in parallel, it will be kinda hard to not discharge them all at once since all their +/- terminals (presuming that you are working with largish electrolytic caps) will be connected together.

Be careful, you can get quite a jolt of power when discharging. If you just put a switch across the bank pins you'll probably invent the one-time-operation switch. For an educational example: Start with a fairly low charge voltage and a small number of capacitors. Charge them up, disconnect the charging current, and lay the shaft of a screwdriver you don't much care about across the terminals. Then extrapolate to the voltage and capacity you were thinking of using.

It's also a good idea to put a fairly high resistance resistor across the terminals so the bank slowly discharges when disconnected. Otherwise you can get quite a shock when you casually pick them up after they have not been powered for a while.
 
schip666! said:
It's also a good idea to put a fairly high resistance resistor across the terminals so the bank slowly discharges when disconnected. Otherwise you can get quite a shock when you casually pick them up after they have not been powered for a while.


awwww that was the good ol' mean trick to do to the new trainee techs in the workshop
... leave a few charged caps lying around waiting for the unsuspecting ;)

cant do it these days with OH & S etc etc taken all the fun out of the workplace ;)


but on a serious note, I would like a better explanation from Learnphysics on what he meant by using a switch to discharge the cap bank.
Did he want the switch to discharge the cap charge into a specific cct in one burst
thats ok :)
but if he was wanting to just to short out the cap bank... then as you said .. a really bad idea !

Dave
 
davenn said:
awwww that was the good ol' mean trick to do to the new trainee techs in the workshop
... leave a few charged caps lying around waiting for the unsuspecting ;)

cant do it these days with OH & S etc etc taken all the fun out of the workplace ;)


but on a serious note, I would like a better explanation from Learnphysics on what he meant by using a switch to discharge the cap bank.
Did he want the switch to discharge the cap charge into a specific cct in one burst
thats ok :)
but if he was wanting to just to short out the cap bank... then as you said .. a really bad idea !

Dave

I suppose what I'm going for is similar to what a flash camera does on a larger scale. (with more caps) So a switch that discharges the cap in a burst.
 

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