1. r.prajapat42

    Smps transformer rewinding

    Hi Good afternoon all. My smps HF transformer secondary output is 12 volt 33 amp. I want to increase voltage 24 volt . ampere 5 amp is sufficient for me. Can i increase the secondary turns. Secondary has multi strand, so can i do half the strands and double turns. Or do i need to rewind primary...
  2. I

    High voltage power supply design with off the shelf components?

    Hi, I have been reading a lot about flyback driver circuits for generating high voltages. Tutorials on Youtube are a dime a dozen describing minimalist circuits to drive automotive ignition coils and similar. However these tutorials rarely describe the underlying design theory and considerations...
  3. S

    Low frequency oscillation induced during CCPS discharge.

    Hello all, I am designing a CCPS and using a phase-shifted, series-resonant bridge as the switching topology. There is a DC block capacitor in series with the transformer primary winding. When the target voltage is reached, the H-bridge switches are turned off until a command for the next...
  4. Q

    What is the best Power Supply for Electronic Door/Gate Lock Deadbolt System?

    Greeting Guys, Please advise me to get the best power source for the deadbolt / electronic gate lock system... I want to get the following: - 12v Fixed voltage 2-3/+- volt no issue - 2 amp peak when required at once - Compact Size if possible I am confused about using LED Driver 220vac...
  5. Roxx.R

    Explore other ways to use NiMH charger

    Hello friends, i have an old kodak rechargeable battery charger but nowadays we mostly have Li-ion batteries. I had got this charger with a digital camera. It clearly states to use only NiMH batteries, but i don't have any NiMH batteries and so this charger isn't in use since a long time. I am...
  6. F

    Help Identifying a Through-hole Transformer

    Hello, I need help identifying this transformer from a LED driver. 45C389J41 P.S. Why can I almost never find anything online from the markings on these small yellow transformers.
  7. K

    AC 220V Continuous Ignitor Circuit

    Recently purchased this product: Aramox High Voltage Generator, AC 220V High Voltage Generator Module Continuous Igniter ≥12kV 1A‑2A : Tools & Home Improvement When I plugged it in it did not work. I opened it up and made the circuit in LTSpice. I don't understand the circuit and...
  8. damador_

    TRANSFORMERS 34.5KV to 120/240V to 34.5KV to 480V

    hi! need you help I Have 3 transformes of 100KVA each 34.5Kv Primary to 120/240V in secondary I have a load of 160 KVA, 3P, 480V, so I need to get 480V in the secondary of my transformers, how can I get tthat voltage, what conextion I have to use delta-wye delta-delta PLEASE HELP ME
  9. Younes Thabet

    How to find the right part number for a transformer?

    Hello, I have a schematic of a flyback power supply that i am trying to design a pcb for. But i couldn't find any part number for the transformer in the attached image.. Can someone teach me how to find the right part number for transformers? Or help me find this particular one with the...
  10. manishvatchas

    Help me finding this transformer

    I have treadmill pcb board in that board controller is not working. I found out the problem that transformer inside pcb is not working. Checked the resistance and continuity i found short. I don't know the value of transformer. Nothing is mentioned on it. I have checked in new pcb online. I...
  11. Baker Steve

    Basic question from one rusty on passives

    I am constructing a filter unit that is intended to allow visualisation (on a scope) and measurement of high-frequency interference on 240v UK mains by means of a high-pass filter to remove the 50 Hz component. What would be the best (and safest) circuit to isolate the unit from the mains while...
  12. sojmagic

    How to Read HR Flyback Schematic

    Hello, Can someone please explain how to know which pins are for the primary coil, the flyback coil and the HV ground. I have measured the resistance between all the pins and get either 1.5 or 0.5 ohms and nothing in between. Also, using the method where a 24v supply is connected, I was...
  13. T

    how to get approximately 30V on Vout in this voltage source?

    hello everyone. i´m doing a voltage source and i want to get approximately 30V-500mA on Vout with the smallest ripple as possible. : i got a transformer 12 0 12 V and a 1000V 2A bridge rectifier and 4700uf 35V electrolytic capacitor. The thing is: after rectifying it it should give me 24 *...
  14. Younes Thabet

    Can secondary side wires of SMPS transformer be interchangeable?

    Hello All, I have an SMPS that i want to change its transformer (image below) in the original transformer, pin 7 is connected to ground and pin 9 to a rectifier diode. with another transformer (image below) Now, the primary of both transformers are similar but the secondary of original...
  15. A

    transformer core explanation required

    hello everyone, this is a stupid question but if anyone can answer this, i'd be so grateful. the question is about the transformer core. take a simple EI laminated silicone steel core for example. we know primary winding magnetises and secondary demagnetises. and at a some point an equilibrium...
  16. 7

    What should be connected to the 5th pin of transformer?

    Hello, I'm an electronics engineering student, currently trying to design a circuit that includes a transformer. I'm using Orcad's Capture (Pspice) software. When I searched "Transformer", this part appeared as 'Generic Transformer', the part name goes by 'PWMXFM'. It has 5 connections, I...
  17. Maxxon

    Having some voltage issues with my Google Nest Doorbell...

    I installed a google nest doorbell and it mostly works. I am having some issues with the external digital chime I setup, so I tried to talk to tech support. However, they are very hard to talk to as they don't really know anything about electricity and how it works. They're just basically...
  18. Younes Thabet

    How to calculate primary current in an smps transformer?

    Hello all, I have the following 12V center-tap transformer with below number of turns, I used (Np/Ns = Vp/Vs) to calculate output but i didn't get 12V although transformer specification says it's 12V. Can someone point out where I have mistaken? Also How can I calculate primary current given...
  19. garrettb11

    Unique Delta-Wye Transformer Fault

    I am trying to determine what the secondary voltages would be after the following fault occurred. Basically one phase energized two bushings on a delta-wye transformer. I believe it would be something like this but I am not entirely sure.