# Question about capacitors and diodes

1. Can a capacitor and a diode be used in series to store a charge?
For example, if a diode is oriented such that current can only flow across it and store on a capacitor plate on the other side, and then the voltage source is removed, the capacitor will not be able to discharge in the reverse direction because of the diode, am I correct?
2. How does a coupling capacitor work?
3. If a zener diode has a current flow over it in its reverse bias direction, does it break permanently?
Thanks everyone!
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for the first questions yes this is correct.but the circuit will be like this ----|>|-------------+------- + | =- | ----------------------------- -this capacitor will charge to peak of the source Vp.with t=RC time, R almost "forward diode resistace" so it is almost very low time 2-coupling capacitor the one that used in filtering(high/low/band) or small signal circuits this prevent low frequency signal from pass(DC) cause it has high impedance to low frequency. Xc=1/wc but w =2pi* f which is frequency. 3. for this question i didnt understand u.please explain more.how this current will flow??what is the datasheet say??
Amr
string snipped-for-privacy@hotmail.com wrote:

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On 10/10/06 10:07 PM, in article snipped-for-privacy@h48g2000cwc.googlegroups.com,

This is the kind of question you should try by yourself first. I recommend the Radio Amateur's Handbbok although ANY INTRODUCTORY electronics book written within the past 30 years should have the answer.
Bill -- Fermez le Bush
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string snipped-for-privacy@hotmail.com wrote:

1) Yes 2) Blocks DC, passes AC 3) No, if current is within spec. The reverse direction current is how the thing "zens". :-)