Home |
Search |
Today's Posts |
#1
Posted to alt.electronics
|
|||
|
|||
question about capacitors
Do capacitors collect energy and store it until an external event
causes them to discharge. Or are their capacitors that will collect energy and store it until the capacitor hits some peak level and discharge on it's own. Specifically. I'm curious if a simple circuit can be designed where energy is obtained from a solar cell. The capacitor stores the energy until it reaches the point that it is full, and then discharges the energy which can run a very small motor like a beeper motor for a small time like a second or two. Thank you, Jim |
#2
Posted to alt.electronics
|
|||
|
|||
question about capacitors
Do capacitors collect energy and store it
until an external event causes them to discharge. Harmonica Lover Yup. An ideal capacitor does just that. In the real world, there is a shunt path (the resistivity of the dielectric has some finite value). .. .. Or are their capacitors that will collect energy and store it until the capacitor hits some peak level and discharge on [its] own. That would typically be a 1-time event (destructive breakdown of the dielectric due to an overvoltage condition). There are somee high-voltage ceramic capacitors that have a spark gap built into them http://www.google.com/images?q=capac...+globalsources such that the gap's breakdown voltage is reached before that of the ceramic dielectric. .. .. Specifically. I'm curious if a simple circuit can be designed where energy is obtained from a solar cell. The capacitor stores the energy until it reaches the point that it is full, and then discharges the energy which can run a very small motor like a beeper motor for a small time like a second or two. "Everything should be as simple as it is, but not simpler." --Albert Einstein You just exceeded the limits of the system. What you want will requre external circuitry in the form of a threshold detector (comparator). This requires "active components". |
#3
Posted to alt.electronics
|
|||
|
|||
question about capacitors
On 2006-03-25, Harmonica Lover wrote:
Do capacitors collect energy and store it until an external event causes them to discharge. Or are their capacitors that will collect energy and store it until the capacitor hits some peak level and discharge on it's own. Specifically. I'm curious if a simple circuit can be designed where energy is obtained from a solar cell. The capacitor stores the energy until it reaches the point that it is full, and then discharges the energy which can run a very small motor like a beeper motor for a small time like a second or two. Something that's sensitive to the voltage in the capacitor and capable of switching the load on at an apropriate level would be needed. I've seen PUTs (programmable unijunction transistors) used for this task but I don't understand their application myself. Bye. Jasen |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
How do shorted electrolyic capacitors measure up? | Electronics Repair | |||
Simple question regarding Ceiling tiles and sound? | Home Ownership | |||
FS: Lots of 500: 50V 22uF Electrolytic Capacitors :: $ 27 SHIPPED | Electronics | |||
FS: Lots of 500: 50V 22uF Electrolytic Capacitors :: $ 27 SHIPPED | Electronics Repair | |||
Identifying non-electrolytic capacitors? | Electronics Repair |