Questions tagged [transformer]
A transformer couples two or more AC signals through a magnetic field. Often used as galvanic isolation and to transform one AC voltage to another.
3,935 questions
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Who still manufactures anything close to these center tap tunable inductors? [closed]
These center tapped tunable coils were used extensively in 1950-1960s era electronic organs. Usually used in a Hartley oscillator, their value must be around 150-500mH for these larger winds (I don't ...
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No output Voltage by using flyback transformer with IRFZ44N [closed]
I am designing a circuit that takes a 12 V DC input from a battery and produces a 24 V DC output using a duty cycle of 45% . I generate a 66.5 kHz PWM signal from an Arduino and apply it to the IR2110 ...
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2 answers
124 views
How to Calculate flyback transformer primary and secondary number of turns and turn ratio?
I try to design SMPS converter with flyback converter topology. I can find right value of flyback transformer. For CCM, what is the equation for calculating primary and secondary number of turns & ...
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1 answer
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Confusion regarding Secondary Current Direction and Lenz's Law on a Transformer
I am trying to understand the exact mechanics of secondary current induction, specifically the direction of current when the primary winding begins to conduct. I have found conflicting diagrams online ...
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1 vote
1 answer
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Self-built flyback not operating as intended - output voltage too low
I have built a ETD44 flyback with 11 turns on the primary and 144 turns on the secondary. I am using 0.75 mm paper as spacers and the core material is PC40. The diode on the output side is a FEP30 ...
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2 answers
98 views
High Voltage Shock Safety in Electroadhesion
I am working on an electroadhesive for a project this year, and I need to find some sources that I can cite for the safety of the high voltages involved. The high voltage converter that I was going to ...
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3 votes
2 answers
287 views
Direction and Orientation of Current in Transformer
I'm using this current transformer to measure AC current in my application through a metering IC. This input from the secondary of the current transformer goes to a differential ADC in my metering IC. ...
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1 vote
2 answers
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Clipping waveform before the full bridge rectifier: What could be the reason?
I have a small audio mixing console which is supplied by ±19 V AC from an external transformer. The transformer started making a buzz sound, so I opened it up (because it was also much easier to start ...
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Discrepancy Between LTSpice Simulation and Real Measurements
I have designed a circuit that we use in practice, and it works correctly in real life. we connect J2 to microcontroller to monitor the current in primary side. it is working so good in practice. I ...
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10 votes
4 answers
940 views
$3 Aliexpress 12V 3A Adaptor
Impulse buying. While I don't expect it to pass the safety best practices nor the cleanest 12V, I have to be sure what I bought is not going to burn down the house. :) Still learning Elec, but as far ...
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1 vote
2 answers
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Understanding circuit that produces a sound that alternates on and off
I am new to electronic engineering. I bought the Elenco 130 playground as I prefer to learn through practice. I am also reading a book called Teach Yourself Electricity and Electronics. I opened the ...
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1 vote
1 answer
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Trying to limit the current going through a transformer coupled to a Piezo Speaker. Why is the speaker louder using an Saturated NPN transistor?
I'm working on a project where I need to update an existing design to resolve an issue with the audio amplifier circuit overheating when the volume is set to HIGH. My approach was to replace the NPN ...
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1 vote
1 answer
166 views
Power Transformer Won't Step Up Voltage
I am currently trying to use a large Class 2 Non-Inherently Limited Power Transformer (specifically Triad Magnetic's VPP24-2330) in a DC/DC flyback converter. However, the transformer doesn't appear ...
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1 vote
1 answer
102 views
How can we determine the load on the secondary of a transformer in order to achieve nominal current on it?
I have the following question: How can we find the Load that it must be connected be on the secondary in order to achieve nominal current on it? My solution is the following: By applying KVL: $$VphA = ...
0 votes
2 answers
134 views
Why is the power loss in an inductor less than that of a transformer of equivalent inductance by an order of magnitude?
I tested two inductors and two transformers close to 1 mH and there was very little power loss in the inductors when driven by a square wave and yet the transformers had significantly higher power ...
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