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Zener Diode Voltage Regulator

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41 Threads found on Zener Diode Voltage Regulator
Simple transistor and zener regulator. (The zener can also be a combination of diodes/ led's/ current goes through the load, so it may not be satisfactory with every load.
Make sure the zener diode is not faulty. A shorted or very leaky diode will tend to shut down the regulator or keep the output voltage very low. The 33 k resistor value seems a bit low for me. Without seeing the complete circuit, it will keep the opto on. I would have expected more like a 330 k value for (...)
Your schematic shows no filter, it is simply a voltage limiter consisting of R 65 and CR 11 (a zener diode). The capacitor is not necessary. If it might filter anything then one will need to know the Vin source impedance.
I have a problem with estimating the minimum and the maximum zener current of a specific diode. It's part number is "TZS4678" from these series. I am thinking of finding Iz max this way: Iz max = Ptot / Vz max I'm not sure if I can find the
Hi, I am planning to use Single Li-ion for my board with MCU and other ICs. Li-ion voltage range is from 3.0V to 4.2V. Since some of my ICs' supply voltage should not exceed 3.6V, i am planning two regulate the voltage to at least 3.0V. My questions are: 1. What is the minimum input voltage if I will be using 3.0V (...)
Hey! Can someone explain me why people don't use zener diodes instead of voltage regulators (for ex. With an lm317?)
Reverse biased zener diode acts as voltage regulator.
Hello, Is the zener BJT linear regulator in figure 3 more likely to drop out in cold weather or hot weather? I believe in cold ambient it would be more likely to drop out but do you agree?
not sure how you define 'best' mriad of ways: from LM317 to plain old series pass regulator with a zener diode.
A voltage regulator is used to derive a stable voltage from a non-stable (or slow varying) voltage source. They are present in lots of electronic equipment where a stable supply is not present. When the required current is low, a zener shunt regulator can be used (is also cheap). (...)
Just cut the grounded terminal of R2 and connect it to the cathode of a 16 V zener diode and connect the anode to the ground.
What about a resistor, transistor & zener diode?
A zener diode is the basic voltage regulator. It is capacitor-less. Many voltage regulator circuits use a zener diode. An internet search will turn up lots of articles and demonstrations. Also at the bottom of this webpage, see a list of related thread (...)
A simple transistor regulator can do what you want. A zener diode provides the reference The scope traces tell the story. To operate a 5V device you must maintain supply above 5.6 V or so. It will take some effort to c
From the ADXL326 data sheet: current consumption 300uA ... I'd use a resitor (say 1.5k) followed by a zener diode (between 8 and 12V) and then 3V linear voltage regulator with typicalllly associated components such as input/output capacitors .. :wink: IanP
zener diodes can be used to produce a stabilised voltage output with low ripple under varying load current conditions. By passing a small current through the diode from a voltage source, via a suitable current limiting resistor (RS), the zener diode will conduct sufficient (...)
You might use iterative solving when the calculation is too complex for using direct calculation. Particularly when calculating an answer changes the parameters of the equation. Example, what is the resistance developed by a zener diode when it is used as a conventional voltage regulator? Known values are (...)
With 7805 or LM317 you get short circuit and overheat protection as a bonus (compared to the zener solution) Alex
For your need the steps should be as follows:- AC Mains-->Step Down--->Rectifier-->filter + regulator A zener diode can be used with AC source but the result is different from what you need. zener diodes are available in a wide variety of zener voltages and power (...)
Hello Dv_sa559, Thanks for your reply ya.. Normally the regulator draw more current compare with zener diode, am i rite? I have another concern. Is it possible to increase the resistance to 150K at R2 to limit the current. Since the RTC requited 27uA only. Not sure whether the input voltage will damage the RTC? Thank you,.