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AC DC Converter TOP246P
Hello,   I want to convert 85-265 TO 24V 1A the below I use schematic. but I do not know why the drain voltage is not goes down to 0V. For Testing the circuit I use 120V dc...
Wednesday, 3 March 2021 - 19:47
Multi output Fly-back SMPS
Hello,   I design Multi output Fly-back SMPS input +110v ac and output +5 -5. +5V dc of this circuit has feedback and output capacitor is 1000uF. This positive part...
Sunday, 16 February 2020 - 21:19
Power supply Design guide
Hello,   I have some questions that remained unanswered till now. I really eager to know about the reasons why those marked on the attached schematic are used. It is...
Monday, 27 January 2020 - 07:30
Boost MC34063
I use MC34063 as a boost converter I need to convert 24V to 48V 1.5A. This regulator cannot deliver all current without external MOSFET as a result I drive IRF540 by chip to...
Thursday, 23 January 2020 - 23:33
Linear and switching regulator voltage protection
Hello, What is the best way of designing a voltage protector for regulator's voltage if they suddenly burn or cannot working properly and how to survive our remained circuits....
Saturday, 18 January 2020 - 17:27
EMI Filter PCB
Hello,   What is the correct way of designing EMI Filter PCB. Can any one explain why the PCB shape is like hacksaw (as specify on the PCB by 1 and 2 square indicator)and...
Saturday, 18 January 2020 - 17:20
Switch 220V by 110V pulse
Hello, I have 110V motor which turn 110V Fan ON while motor is running. Because of some reasons, the fan cannot work properly any more and I could not find its new spare part...
Saturday, 9 November 2019 - 20:28
DAC IC vs Resistor ladder
Hello,   I want to know the different between resistor ladder and DAC IC, If I use precise resistors(1%). Regardless the communication protocol that DAC IC provides what are...
Thursday, 20 June 2019 - 08:02
Design RF transfomer
Hello,   I have single turn magnetic loop and I want to make matched network for transferring power. The design need a impedance transformer to sending power. I am ...
Monday, 17 June 2019 - 21:33
Output impedance
Hi,   1-I want to calculate output impedance of the power amplifier like TDA2030 or a common transistor power amplifier class AB. In this kind of calculation the goal is...
Sunday, 24 March 2019 - 16:15
TL431 and optocoupler
Hello   I have a question about using TL431 and optocoupler as feedback. The attached circuit is as an example. Does it invert the signal, I mean if the Vout increase,...
Friday, 15 February 2019 - 13:35
Differentiate circuit using opamp
Hi,   Can any one help me why my circuit resonant like this ? I need the max gain of the circuit which is equal to Vout=-RC.(dVin/dt).   Thanks
Tuesday, 27 November 2018 - 20:03