Diodes are semiconductor components made from a P-type and N-type silicon material, that allows current to only flow in one direction.

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42 views

Will current flow beyond the diode?

V2 is blocking any current passing diode(1) because of the voltage being higher,however, V3 is equal and opposing V2, therefore canceling out and allowing current flow through the diode? ...
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0answers
18 views

PIN Diode T-R Switch for use with RF Power Amplifier

I would like to use PIN Diodes to actuate the T-R switching of my RF Power Amplifier, however, I am having trouble understanding the proper way to accomplish this. I would rather use a solid state ...
0
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4answers
79 views

Optimize PNP/Diode Schematic

I am trying to design a circuit which has four switches, numbered 1-4 as in the diagram. The circuit should function such that closing switch n turns on light ...
-6
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1answer
71 views

My Circuit is leaking voltage. What diodes\methods can I use to fix this problem [on hold]

Okay so here's the deal I am using these items in parallel to power one load in order to supply enough current (3A max) at a constant 5V. I won't get into detail about why exactly I'm using ...
0
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1answer
59 views

Diodes between rails

I recently saw a circuit that implemented a BAV99, which is just two diodes, between +3.3V and GND. How does this work? Based on the spec sheet, the fwd voltage varies based on the current. Am I to ...
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1answer
31 views

Related to varactor Diode?

I'm working on my project during this i face some problems... Here i mention my problem:- I required some variable capacitance whose range is C=0.05pF to C=0.5pF. So there is any variable ...
1
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1answer
42 views

Tunnel diode I-V curve noise [on hold]

Wikipedia gives this example of an I-V curve of a tunnel diode. What is the "noise" in the negative resistance region? Is it a characteristic of the diode or of the measuring circuit? The caption says ...
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1answer
37 views

Determine I through load resistor in circuit with diodes in series

I'm trying to find an expression for the current through the resistor \$R\$ when the AC-source is at max voltage of 5 volts. \$U_T\$ represents the voltage drop across each diode. \$R_D\$ represents ...
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2answers
37 views

Working of 2 input AND diode register?

According to the description that I am reading in book it says that you need to connect +Vcc to both the A and B in order to get the output 1 at Q. I don't really understand this. What does the ...
0
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2answers
98 views

Does the voltage drop “pass” like current?

Q: Suppose this diode is silicon. So it can't have more then 0.7 voltage drop. If,after the diode has aquired 0.7 volts, more voltage comes from the voltage source,then what happens? Does the diode ...
9
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3answers
272 views

Is it safe to treat a system downstream of a reverse-biased diode as de-energized?

Suppose I have a 480 VAC line, feeding a rectifier and filter caps. Obviously this is not something to be trifled with while live. Now, suppose there are blocking diodes coming off the DC bus, as ...
1
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1answer
55 views

TVS Diode selection

I am designing a motor controller for a 24V 2.2KW d.c motor but I have a problem. I have been unable to get the 1.5KE39CA TVS Diode spcified in the design guide i am following. But i have two ...
3
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2answers
71 views

Please explain the circuit (current regulator test circuit with Zener diode)

my mind needs refreshing so could someone please help explaining analysis of this circuit. It is used for testing a current regulator (LED driver circuit) ('I' in the image). The regulator current is ...
1
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1answer
22 views

Fundamental difference between DC IV measured current leakage and AC CV measured conductance

I am a physicist with an general EE measurement question, thanks in advance for the advice! I am measuring the properties of a majority carrier diode that I am designing, and usually just take DC IV ...
5
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1answer
369 views

How protective diode protects transistor from breakdown?

Please, explain the process of breakdown; how exactly this protective diode protects the transistor? In a Horowitz & Hill book, "The Art of Electronics", 2nd edition, in "Chapter 2 - Transistors" ...
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0answers
33 views

Dc Motor drive setup

I would like to ask why in this setup the dc motor is parallel to the fet and what is the reason for the diode. Thank you!
1
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1answer
100 views

“zero voltage drop diode”…Really?

In my research for this question, I found this by a new user that hasn't been seen before or since. His low investment here and the "say goodbye to traditional bad stuff" language makes his answer a ...
0
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2answers
72 views

How to analyse this diode circuit

what will be the voltage at Vx if D1 and D2 are practical diodes This is not a problem from some text book. This circuit came in my mind while i was studying differential amplifiers.
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1answer
36 views

Controlling the current through a Diode Bridge VCF

I'm investigating different analog low pass filter circuits and came across this Yamaha patent which ingeniously utilizes a diode bridge as a variable resistor. It takes some reading but in short: ...
3
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2answers
69 views

Alternative ways to maintain temperature stability of silicon BJT circuits other than feedback resistors

So I've been messing with Bipolar Junction transistors lately and I'm trying to really nail the concepts of designing circuits with these things cause I want to start using them in some of my circuits ...
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0answers
58 views

Are Germanium Zener diodes still obtainable?

I need a Germanium Zener diode for a shot noise generator circuit. If I am correct, Silicon replaced Germanium for use in diodes and other semiconductors because of the fact that Germanium diodes have ...
0
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1answer
62 views

Exceeding voltage ratings on microcontroller pins using series resistor

I've been designing a circuit which requires a microcontroller to read a voltage above its current VDD or below its current VSS. I've done this once or twice before by putting a large-ish resistor in ...
0
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1answer
39 views

Switching and protecting batteries from external power supplies

my device can work from external power source as well as from two AA batteries, so voltage in this case is 3V, but external supply is 5v. I need to protect my circuit and power supplies in case of ...
3
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1answer
240 views

Purpose of this diode on this circuit?

I have this circuit and I do not understand the purpose of the diode connected to the ground. This is a Bluetooth device (works at 3.3v) that has a 4x 18650 battery pack and a USB charger. When you ...
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1answer
26 views

LED Remote, Isolating 2 channels

I previously had a simple remote that allowed me to turn the LED strips on my motorcycle on and off when parked, which then I also wired in a separate relay so that the strips turn on with the ...
1
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1answer
49 views

Waveform Clipper

I need help solving this circuit. It's supposed to be a waveform clipper and I already simulated it, however I want to know how the circuit works and so far I haven't been able to analyze it properly: ...
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0answers
22 views

What are important parameters for a flyback diode? [duplicate]

I need a flyback diode for a 12V/50mA relay that is switched by a BSS138 MOSFET. Do I need one or more of the following: Schottky diode fast recovery diode high current diode or would a 1N4001 or ...
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2answers
61 views

Calculate current over ideal diode

I have to solve the task shown on the image below. (The diodes should be ideal with a forward voltage of 0.7V) I tried solving it but always got the wrong current for D1 and V. First I drew it new ...
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2answers
65 views

Calculate the voltage and the current of a ideal diode

I need to calculate the circuit below. (The used diode in the schematics is not the same from the task we have to solve. In our task we work with a ideal diode.) simulate this circuit – ...
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1answer
34 views

Is this calculation for an optocoupler's resistor correct?

I'm trying to calculate what resistor to use for this optocoupler. Per the datasheet, it drops 1.3v at 50mA does this mean I should try choose a resistor that gives me 50mA? My supply is 3.3V so my ...
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1answer
65 views

On sketching an equivalent circuit

Given a circuit like the one on the picture, I am very confused on how to reduce it to a simpler form(I do it because at this point I am more comfortable with solving circuits which are all in one ...
2
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1answer
60 views

Directly Power STM32 from Lithium Battery

I'm putting together a wireless sensor node and it's running a STM32L051 which can run at a 1.65-3.6v range. I've also got an RFM69HW radio onboard which can run at 1.8-3.6 (2.4-3.6 for full power ...
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2answers
44 views

Diode Bridge with differential voltages. Transfer function

Hi, I've been struggling with this problem for about an hour and I just don't know how to determine the transfer function for this circuit. My first attempt was analysing how the circuit behaves ...
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1answer
47 views

Clipping circuit simulation producing unexpected result

I am playing around with a clipping circuit to protect a adc on my microcontroller. I beleive the following will work, but when I simulated the circuit I saw something funky. Any ideas on why adding ...
2
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1answer
71 views

LDO with supercap and diode circuit

I'm looking for an alternative for a backup battery i'm planning to use. PCB is powered by 24V DC power supply. I'm using a 3.3V LDO in combination with 3,6V battery to power mcu and other components ...
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1answer
26 views

Write V_final in terms of V1

simulate this circuit – Schematic created using CircuitLab Being \$V_1=10\sin(100t)\$ and \$V_D=0.7\$V, it is asked to find the output potential as a function of \$V_1\$. I made: ...
8
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2answers
220 views

What is the purpose of input protection on USB (or at all)?

I have seen quite a bit where reverse biased diodes are used to clamp input voltages when spikes occur. What is the typical reverse breakdown voltage for a diode used in this type of application? ...
6
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5answers
754 views

How is it possible for voltage to exist when only a single voltage source terminal is connected?

Please take a moment to look over the circuti below: As you can see, the circuit is nothing more than a 10 volt power supply and a diode. Note that the power supply negative terminal and the diode ...
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1answer
29 views

Can diodes be used as an OR gate when I use RTL for other gates?

I have been using RTL (Resistor-Transistor Logic) to build things like NOT gates, or any other types of logic. If diodes control the flow by letting electricity only flow one way, then could I use two ...
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2answers
62 views

Diode parallel to resistor on H-Bridge MOSFETs gates

I was looking at a TC4467's gate driver datasheet and there is one thing there that I haven't seen before when reading about H-Bridges. On the schematic of example H-Bridge motor control there is a ...
0
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1answer
39 views

Constant Voltage model pf Diode circuit analysis

I have solved this problem assuming an ideal diode model, but now I'm required to use the \$0.7\$V constant voltage model. If the same circuit in ideal model had both \$D_1\$, \$D_2\$ conducting, does ...
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1answer
25 views

diodes circuit analysis problem

simulate this circuit – Schematic created using CircuitLab assuming the diodes are silicon diodes (o.7 volt) which one is on/off and why , and what is the current through or voltage cross ...
0
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1answer
23 views

Minority Carrier Diffusions Equations in the derivation of Shockley equation

I am trying to get an intuitive grasp of the derivation of the ideal diode equation and I am struggling with a couple assumptions although the math itself looks pretty straightfoward. I am ...
0
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0answers
30 views

Diode at reverse biasing

Why the electrons don't move that way : giving that : 1- if the electrons of n type managed to get to p type and electric field will help them circulate again as electrons flow against electric ...
0
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0answers
48 views

Diode as variable capacitor

I'd like to ask about: Regarding the diode as variable capacitor, I've read that at reverse it will acquire more charges in the depletion region but imagine we did so then remove the diode from the ...
0
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1answer
56 views

Using a diode to lower supply voltage to nrf24l01+?

I was wondering if I could use a IN40007 diode (or Zener diode) instead of a 3.3V voltage regulator. I plan to power the module using a 3.7V LiPo. Since the battery would be 4.2V when fully charged, ...
0
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1answer
28 views

BZY97C47 zener diode datasheet questions

The BZY97C47 data sheet (I found no direct PDF link) confuses me on several points. I fail to find straight forward information about the maximum allowed forward current from the data sheet. Also, ...
1
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1answer
76 views

What happened to my second half cycle of my half wave rectifier?

When I'm doing a simple half-wave rectifier with the set-up as shown above (Note: Diode D2 is not connected) and connected terminal 5 and 4 with positive and negative terminal of oscilloscope, this ...
0
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0answers
72 views

TVS Diodes Exploding, how can i suppress transients?

I am using a TVS diode to prevent the switching transients taking my capacitor above 75V to prevent my dc-dc converter being damaged. However the TVS is dissipating way to much power and exploding ...
0
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0answers
39 views

Discontinuity in I/O characteristics

I've have been trying to figure out that problem and checked the answer and found a discontinuity in the I/O graphs is it possible ? and what is the physical meaning ?