All Questions
72 questions
3
votes
3
answers
524
views
How can the diode conduct in negative half cycle of AC signal in clamper circuit?
Could you kindly help me understand the clamper circuit. I watched a couple videos and I'm confused. My confusion is in positive clamper circuit. How can the diode conduct during the negative half ...
- 33
1
vote
2
answers
69
views
Determining the region of operation of these two diodes
I'm having trouble determining the region of operation for these two (ideal) diodes. Do I check the Vopencircuit values or their current values?
- 33
0
votes
0
answers
119
views
What is the most efficient way to detect if AC mains is live for interfacing with a microcontroller?
I want to implement an electrical mains level detector to interface with a microcontroller the simplest and most efficient way possible as this circuit would always be on. I’m trying to detect when a ...
- 133
0
votes
0
answers
70
views
Does an AC Diode Chain require cross-links?
I found an example of reducing AC voltage by using a double diode chain (on a train modelling site) but it shows each pair of reversed diodes cross-linked as well as connecting to the next pair in ...
- 11
0
votes
0
answers
96
views
Full wave rectifier 2nd and 4th waves doesn't go up as it should [duplicate]
I'm using four 1N4007 diodes and one 15k resistor. I already changed diodes and cables dozens of times, it doesn't change, even I change the oscilloscope or arbitrary function generator, nothing ...
1
vote
1
answer
48
views
Split AC with diodes - missing current in opposite direction
Here is my circuit
Here is output of measurements:
I cannot understand why there is no current in negative direction. Current keeps flowing in positive direction when there is negative voltage.
- 411
2
votes
1
answer
357
views
Repairing Garage Door Control Board
Update summary:
I recapped the whole board :D - It works perfectly!
Re the main/bigger cap, my local electrics shop didn't have a 330uF 35V so I went for a 470uF 35V instead.
Just for my own learning, ...
- 159
1
vote
5
answers
584
views
Why does the neon screwdriver (phase meter) light on just by touching the phase wire?
I had a question, can you answer it: as you can see in the picture I uploaded, the single-phase alternating current flows in one wire at one moment and in the next moment from another wire as in the ...
- 11
0
votes
1
answer
308
views
Diode in parallel with AC solenoid valve
I have a circuit I'm trying to design to fire both 120VAC and 24VDC solenoid valves. We have relays that work on 12vdc for the coil, and can switch AC or DC. the valves are normally around 30W. I ...
- 135
1
vote
2
answers
1k
views
How do we calculate output voltage in clipper circuits?
In the below circuit, when the diode is forward biased, the current is passing through it and not from load resistor (R_L), but the voltage across both of them (diode and R_L) is same as they are in ...
- 11
3
votes
3
answers
2k
views
I need to test multiple lights that turn on individually using a single switch. I don't understand the use of diodes in this diagram
I have the diagram below. Wire 4 has a phase of 120VAC and N is the neutral. I need to test several lights that turn on individually each one using different contactors that are activated by sensors (...
-1
votes
1
answer
54
views
Three diodes in series AC detection
Why, in the circuit shown here, would you put three diodes in series with one another instead of using one diode?
- 1
2
votes
3
answers
290
views
Diode in series with a resistor an in parallel with another resistor
I have been facing some troubles with this problem.
My main concern is that if Vab = 0.7 (when V(t) > 0 V,) will the diode conduct? I think that isn't the case, but if that so I don´t know how to ...
- 21
2
votes
1
answer
235
views
Finding the mathematical function that describes voltage across diode and resistor circuit
I have the following circuit:
simulate this circuit – Schematic created using CircuitLab
Where \$\text{V}_\text{i}\left(t\right)=\hat{\text{u}}\sin\left(\omega t+\varphi\right)\$ and the ...
- 8,588
1
vote
2
answers
1k
views
KBPC5010 voltage rectifier
I bought this voltage rectifier, this should be a simple Graetz rectifier, however, there are 2 strange issues I run into:
The output DC voltage is higher than the input AC voltage. Why? For example ...
- 19