When the design says 4.9v zener diode that is all I would put. The more complicated an alternative you try the more things that can go wrong.
A silicon diode is not the same as a zener diode, and cannot be used to replace a zener, with reasonable expectation that the circuit will continue to operate as designed.
If you are saying that the Zeners are connected in series, the answer is Yes.
"The Great Leap Forward"
connect 2 2ohm resistors in parallel and connect it to a series 2ohm resistor
A resistor is connected in series with a practical voltage source in order to determine the current produced by the source.
A: To read ohms you will use it by reading in parallel and without any external voltage applied
A; The 1N4xxx series of rectifier diodes are specified as 1 amp forward conduction. the last number signify the maxi mun reverse voltage it can sustain without breakdown.
The entire 1N40xx series of power diodes are all silicon. The OA79 small signal diode is germanium.
Connecting diodes in series:Connecting diodes in series will increase the forward voltage of the resultant diode.Connecting diodes in series will cause an open circuit until peak inverse voltage (smallest diode) is applied on total resultant.Connecting diodes in parallel:Connecting diodes in parallel will increase the current carrying capacity of the diode.Connecting diodes in parallel will not get you a resultant diode conduction in both sides.
A: The question remains why would anybody connect diodes in series to begin with only one is necessary. So the solution is use one
It would be 0.7V, the same as any other silicon diode; except for one thing, most zener diodes are manufactured with a reversed diode in series with them. When the zener is operated in its normal zener breakdown mode this reversed diode conducts, letting the zener operate. When the zener is operated in its forward biased mode this reversed diode prevents conduction. Thus most zeners have no forward voltage.
It would be 0.7V, the same as any other silicon diode; except for one thing, most zener diodes are manufactured with a reversed diode in series with them. When the zener is operated in its normal zener breakdown mode this reversed diode conducts, letting the zener operate. When the zener is operated in its forward biased mode this reversed diode prevents conduction. Thus most zeners have no forward voltage.
First off, I don't know if by current flow you mean conventional current flow or electron current flow. You realize they are in opposite directions and most electronics engineers use conventional current flow in circuit analysis.Ignoring this, I will assume your real question is "Why does current flow backwards in zener diodes compared to ordinary diodes?" The answer is that zener diodes are not operated in the forward biased range as are ordinary diodes, instead they are operated in the reverse biased range. When reverse biased enough any diode reaches breakdown voltage and suddenly conducts. Most ordinary diodes can be destroyed by breakdown, but zener diodes are designed to tolerate it. In zener diodes, this breakdown is referred to as "zener breakdown" and the voltage it happens at the "zener voltage".Low voltage zener diodes can still be used in the forward biased mode, like ordinary diodes. However most high voltage zener diodes have a "blocking diode" that is not documented on the data sheet to block forward biased operation. "Blocking diodes" are simply ordinary diodes wired in series with the zener; when the zener would be forward biased they are reverse biased (and thus blocking current), when the zener would be reverse biased they are forward biased.
Connect positive to negative, leaving the end positive and negative connections free to power circuits or devices. Connecting batteries in series adds the voltage of the batteries. For instance, connecting three 12v car batteries in series will create a total of 36v, enough for welding.
The nominal voltage of a led-acid battery is 13.5 V (almost 14). All equipment connected to 12 V batteries are design to withstand the 13.5 V and a little more. If worried, connect one or two silicon diodes in series from the + terminal of the battery to your camera, as follows: _____ _____ (+)-------[_____]-----[_____]------(o) Battery Cathode Cathode Camera input terminal The diodes will create a constant voltage drop of 0.7 V each. If you mount them inside a lamp switch, when the switch is on, the diodes will be short-circuited (charger off); when the switch is off, th diodes will be inserted in series (charger on)
Series clipper diodes are in series connection with the load while Parallel clippers are in parallel connection with the load.
Selenium diodes work much like any other diode. They allow current to flow in a forward direction and block current from flowing in the opposite direction. They have a higher forward bias voltage then silicon and as such generate much more heat then a comparable silicon diode. Most selenium diodes will therefore have an integrated heat sink that helps to dissipate all the heat generated. As a zener diode, selenium is used in surge suppression where its heat sink helps in survivability during a surge. However, its low alpha (measure of nonlinearity) means that the voltage during a surge is very high and usually unsuitable to be used as protective device without other components in parallel. The reverse voltage is about 26 Volts, so to get higher voltage zener diode, many are placed in series. By connecting them back to back, then a bidirectionial zener diode can be created. Selenium diode were very common in the 1950s and can be seen in industrial applications of the time. Some model train power supplies were seen to use these components. Since the advent of silicon diodes and their more efficient operation, these part have disappeared from use.
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