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Do I need a Schottky diode as a flyback diode with PWM @ 30 kHz?
I use a regular diode (1N4007) as a flyback diode for a 250 mA5 V fan. My transistor is a 2N 3904 and the PWM generator is an ATtiny85:I use this one because originally I was switching the PWM signal...
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How to understand and improve Simple Diode Amplitude modulator circuit
Here is the circuitI am a beginner so I'm not sure what exactly could be done to improve the circuit but let me go through what i understand about the circuit.The circuit is comprised of the followingA...
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RH3G-F1 damper diode replacement
I need to replace D521, a RH3G damper diode connected to horizontal signal of a CRT monitor, but I can't find a replacement anywhere. Which diode I can use to replace it?
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How do I calculate the amperage of a circuit with Zener diode?
I'm new to Semiconductor Physics, and I have only been taught about the nature of the components; however, the experiments that are taught along with the lectures require calculating said items, which...
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How do these diodes protect this simple DC motor circuit?
In the following circuit does D1 protect the voltage source when it's switched on and D2 protect it when it's switched off? I'm a little bit confused, because in circuits with inductors that I've seen...
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Identifying a Suitable Replacement SMD
I have a circuit board that suffered some damage (burnt diodes) and I am attempting to fix it. It has a series of SMDs which I believe are LEDs. The only markings on them are a green "20". Could anyone...
View ArticleI have a question about a measurement on a diode that ive tested
I working on a Samsung refrigerator and there is a inverter circuit board that supplies the power to the other boards and compressor. Following the topology and provided technical charts and an onboard...
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LTspice result does not match manual I-V plot for ideal diode
I wanted to start using LTspice to check my circuit analysis, but the result I got is wrong for current I(D1) in I-V plot for ideal diode. I expected I(D1) to be in 3rd quadrant as shown with red...
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(Sort of) diode OR'ing a PoE supply output and a buck regulator output
I have a device that can be powered by two input supplies, 1) PoE or 2) by a DC input that can accept 5-24V.Internally, I need a 3.3V rail. I'm using the LM5070 IC reference design (see datasheet) to...
View ArticleSigmoid using op-amps
I want to build a sigmoid function circuit using any of op-amps/diodes/resistors. The input will be one voltage \$x\$ into the sigmoid circuit. The output of the circuit should be:...
View ArticleCLM effect in diode connected MOSFET
If i have a diode connected mos transistor, will it suffer from channel length modulation?Im not fully sure about that, but as i think about it, channel length modulation effect occurs in saturation...
View ArticleIs it normal to be able to tear off PCB components with bare hands?
I just ordered 5 boards from a popular Chinese PCB manufacturer and (for the first time ever with this manufacturer) some SOD-323 diodes and their pads and adjacent tracks were peeled off out of the...
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If diodes fail open with an overcurrent condition, why do they sometimes fail...
I've been doing some research on how diodes fail, and to my understanding, diodes (specifically traditional and Schottky) fail open when their rated current is exceeded for an extended period of time,...
View ArticleVoltage Regulation for a high frequency signal - Arduino Input
I'm trying to build a digital tachometer for my motorcycle using an Arduino nano. I have researched a lot on how to reduce the 12 volts from tach signal to 5 volts to be read by the arduino. One post...
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Diode contribution in photo-diode's model
A common model used to represent a photo-diode is shown below:It is then said that the current through Rsp (series resistance) is ip+id, where ip is the current proportional to the incident luminous...
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Clarification on a clipper circuit
I'm reading a paper whose result I am trying to replicate. One of the circuit elements is a clipper circuit as shown below.This is a very straight-forward circuit. The positive value is limited to...
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Help with vehicle killswitch design
I am relatively new to electronics/electrical, and want to design a killswitch for my car, since it is easy to steal.I have created the design shown below, which is intended to function like so:if the...
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Ideal diode using PMOS and two PNP transistors not behaving as expected
I'm using the circuit given in the example here:Understanding an 'ideal' diode made from a p-channel MOSFET and PNP transistors[a]Basically there are two issues.In the forward direction [Vin = 15V on...
View Articleconnecting diode to an ESP32 and microcontroller through breadboards and we...
We are struggling to connect two LED strip lights to one microcontroller. We are also using a GSR (galvanic skin response) sensor that is connected to the ESP32 which is the microcontroller. We use...
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