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Right now, mppt is not a requirement. I just want to harness a reasonable amount of power. The problem is that the panels are located far away (multi-storey buildings top) about 100m away and I can only use a series combination which gives about 230Vdc on open circuit. I want to charge my 24V...
I need to make a simple 200Vdc to 24Vdc step down converter at 1000watts for use in solar power application. The application demands a controlled current output (instead of voltage control) depending on the available power from solar panels. Since the application is for home use, cost is...
I am not saturating the core. The current is a good triangular wave. The copper wire used for winding is 1.5mm thick. I am convinced that the heat is being generated in the core losses. So as mentioned by goldsmith, I will try using a ferrite core with either an "open bobbin" type core or a core...
I have designed a Simple buck converter for 48v to 24v conversion @20A. I am using a 100uH inductor at 32KHz. It is an iron powder toriodal core which is heating up a lot. Can you suggest if I should use a ferrite core instead of iron powder core.
You can do that. That is exactly what I did and rendered 4 ICs useless as I dont have a parallel programmer adapter for ATMEGA8-AU (TQFP). I programmed the reset-disable and could not reprogram the chip again. I had to replace the chip.
Just discovered that if you program the RESET pin of ATMEGA8 as port pin (C6), you cannot reporgram the IC using ISP. This is becuause the ISP uses the external reset pin. The Only way to ersase the chip now is to use a parallel programmer. It cost me 4 ICs to discover that.
Microchip makes a USB-UART converter MCP2200 that is thought to be a PIC18F14K50. If you look at the diagram for the demo board of this, you will see that the controller is powered directly from the USB 5VDC.
Why does my modem reply with a blank string.
I type
AT+CUSD=1,"*444#",15
or
AT+CUSD=1,"*444#"
The reply is
+CUSD: 1,"",15
Even if I type
ATD*444#
it gives the same response
+CUSD: 1,"",15
Why?
Well, I got it running finally. The culprit was voltage. It seems that the SIM900D is much more sensitive to voltage dips than is the SIM300D. I had been running the SIM300 on about 3.8VDC generated with LM317 (1.5A) with a 3300uf/6.3V cap and a 100nF cap near the power pins. But the SIM900D...
Hi Chipseller.
I have been using SIM900D for quite some time now without any problems. Now they say that SIM300D is no longer available. Can I just put a SIM900D instead of SIM300D without any hardware / software modifications. I am just using the following 3 or 4 commands
ATE0
AT+CMGF=1...
A very cheap method to make a CT is to use a small transformer and remove its secondary low voltage winding. Then use a single turn of think wire to serve as high current primary. The high voltage winding can now be used as current secondary with a suitable resistance as its burden (load, shunt).
For current sensing use MAX4081
For AC power metering use ADE7754 / 8
For 150A, you have to use a CT of usually 200/5 ration. These are fairly commonly available since they are used with almost every large electricity metering panel. Then on the secondary you can either use a shunt wire or...
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