Tagged Questions
8
votes
2answers
127 views
Compensating the forward voltage drop of a diode signal rectifier
I am reading Arts of Electronics and they are showing this circuit:
It says that D1 compensates for D2's forward drop by providing 0.6V of bias. I don't understand this circuit at all. Is the +5V ...
3
votes
2answers
158 views
Voltage doubler or not?
I got a quick question! Is the circuit depicted in the link indeed a voltage doubler or is it just a bridge rectifier with smoothing capacitors?
6
votes
3answers
338 views
Why do diodes have a voltage drop?
Is resistance what makes a diode have a voltage drop?
Or is it impedence?
If it is electrical energy being converted to light, please tell me what this effect is called.
1
vote
1answer
120 views
Can I use more diodes to reduce the voltage off a diode bridge?
I have a transformer labeled as providing 9Vac, 3.36 A. It appears to provide 9.4 v ac according to my multimeter.
It runs through a diode bridge (WAB 040 diodes -- already fried the last version), ...
5
votes
3answers
178 views
Dropping voltage for red channel on RGB LED
I'm looking at a Multicomp OSW-8349 RGB LED, which has a Vf of 3V min / 4V max for the green and blue channels, and a Vf of 1.8V min to 2.8V max for the red channel, at 350mA. I'm planning on ...
5
votes
2answers
94 views
Scaling voltage to meet two conditions at once
I am using an IC (STM6600) which, among other functions that I need, is also capable of Undervoltage Monitoring. It works like this:
The IC monitors VCC in comparison to two thresholds, V_Low and ...
6
votes
2answers
128 views
Setting a part's VCC slightly lower than board's supply voltage
I'm interested in using the undervoltage detection feature (in addition to the primary function) of this chip. This IC draws 6 uA (microamps), and accepts any VCC between 1.6V and 5.5V.
The ...
0
votes
3answers
484 views
Why is the voltage across a reverse biased diode equal to source voltage?
Why is it not equal to zero since a reverse biases diode is essentially an open circuit?
3
votes
1answer
119 views
equivalent load resistance
I have the following circuit
I am having some trouble determining the relationships between Iac, Io and Iacpk. I'm not quite seeing how the final equation for Iac was determined, specifically ...
-5
votes
1answer
182 views
diode nightmares
Let me start by saying I am a complete amateur trying to stumble my way through some pretty basic PCB design, and I have run into a problem selecting diodes. The PCB I am designing will be for some ...
2
votes
3answers
758 views
Simple pn junction / diode question
Lest assume we have the setup presented in the image.
What would be the potential difference (not voltage drop) between points A and B? Why?
What effect will the pn junction barrier potential have ...
2
votes
1answer
666 views
How does the Villard circuit double voltage?
How does the Villard circuit double voltage? I don't understand the capacitor role when the voltage sinewave goes negative.
7
votes
3answers
5k views
if a standard three-phase 400V AC connection is rectified what DC voltage comes out of it?
If a standard (in Europe and a large part of the world except North America and Japan) three-phase 400V AC (three lines having 230V RMS voltage if measured to neutral each) mains supply is rectified ...
3
votes
2answers
4k views
5V to 3V, calculate resistor value (or use diode?)
I want to connect this dv motor to the 5V output of an Arduino board. Of course I need to get the 5V down to 3V in order for the motor to function correctly. I've read that I could use a diode with ...
