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I am building a 4.8v to 24v switching power supply based on the MAX1771 IC.
I wish to charge a 22,000 uF capacitor bank to about 24v.
My question is, can I simply replace the output smoothing capacitor C4 of my MAX1771 circuit (diagram 2b on page 8 of datasheet here) with my 22,000 uF...
You say "Just estimate the maximum RMS current through the resistor" ... I understand what you mean but how do I estimate it?
The datasheet gives enough information for me to roughly assume there will be 4v dropped across my resister (My supply is 4.8v and about 0.8v is dropped across diode...
I am designing a 5v to 24v switching power supply using the MAX1771.
I can not find any information in the datasheet on how to calculate the power requirement of my current sense resister.
The current sense resister value is going to be about 82mOhms.
How does one go about calculating the...
Hi all,
I have a project in eagle where I temporarily lost consistency between my schematic and board. I have now added the correctly named parts to my board so there is an exact match between the schematic and board.
However, there are around 60 airwires I would have to manually re-draw. This...
Can I ask why? The calculations show that 0.104 Ohms is correct for my application, so I've used a 0.1 Ohm resister.
---------- Post added at 10:57 ---------- Previous post was at 10:53 ----------
You may be onto something here. I tried replacing the base resister with a 180 Ohms one and...
It's a Panasonic inductor from Farnel so no problem there. Saturation current is 3.4 Amps. https://uk.farnell.com/jsp/search/productdetail.jsp?SKU=1749176
A 44,000 uF cap will draw a maximum current of 0.641 Amps at Time = 0 when charging (see attachment).
The MC34063 calculations show a peak...
Hi guys,
I have breadboarded a simple boost converter based on an MC34063 IC. I'm using an external NPN transistor to switch a higher current than the 1.5 Amps the IC can handle.
Input 12v DC
Output 25v DC to charge a 44,000 uF capacitor bank through a 39 Ohm resistor.
The circuit works fine...
ALEX: The ARM_N is driven from an Open Drain Shift Register. It's OK, I realised the Pic can not drive it directly. Thanks.
FvM: My current design is actually a loop resistance sensor. I am just trying to decide if it's better to have a true current sense as above, or if it's better to sense...
Hello all,
I am designing a firing system for fireworks. The firework is ignited by an e-match, which is a length of copper wire with a small nichrome bridge wire on the end. When current flows through the wire, the nichrome wire burns out and the heat ignites the pyrotechnic composition. The...
Thanks Keith,
Ok, I've added a 1 MOhm resister to offset the gate capacitance of the FET. Also I've swapped the feedback resisters. I've added a 0.1 uF cap as a filter as I am just amplifying steady DC voltages, there nothing with a frequency component.
Updated circuit attached.
Thank you.
Hi guys,
I'm trying to use an OP-AMP as a non-inverting amp with a gain of 350, and ALSO as a unity gain buffer (but not at the same time). It's feeding the ADC input of a PIC micro controller.
Is it acceptable to use the MOSFET to switch the voltage divider to ground as in the circuit...
Thanks for the advice guys.
The only thing is this is eventually going to be a production board, and I assume it costs more to have components placed on both sides of the board, so I was hoping to have components on one side only.
I propose 1 of 2 options.
1) Rip up some traces and and put...
Hi,
I've designed my first board using Eagle. I have a PIC 24F* series MCU in a 64 pin TQFP. There are 3 separate power supply pins on the PIC.
Do I need to decouple each one? I have done this but it looks very messy.
I have just routed the power trace to connect them all to 3.3v underneath...
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