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I am using a linear regulator (LM1117). For reasons that I will not go into here, I have to connect 3 caps (470uF each) to the output. The effective ESR of theses caps is less than 0.05Ω. In the data sheet for the LM1117 they recommend an output cap with ESR of 0.3Ω - 22Ω. I remember reading...
I see your point
I assume you mean 2.4 watts (not watts/hour). If thats the case the LEDs should draw 7.2 watts in total. If they are on half the time that makes 3.6 watts. The electronics should draw less than 1.4 watts, which gives us a total of 5 watts. Assume the inverter is 60% efficient...
Use ultra hi bright LED's, they require much less current and will last longer. Why not wire them up in groups of 4 with 1 resistor for each group and then you wont need the inverter. Another idea - why not keep a spare charged battery in the car. I assume that you will be posting a photo of the...
Ok, that is similar to RS422. The difference is that RS422 uses differential voltage and RS232 uses absolute voltages, which means that RS422 works at much greater distances.
This is ok for short distances. RS232 is ok up to about 50m at low baud rates and RS422/RS455 is ok up to 1 km.
I dont like the idea of connecting 2 outputs together, unless they are open collector ?
rs485 + slave + atmel
Yes this is ok
No, you only need 1 uart with 2 connectors.
If you are new to micros then perhaps you should use RS422. RS485 uses the same 2 lines for transmit and receive, which means the RS485 chip has to be switched. RS422 uses 2 lines for transmit and 2 for receive...
8051 sm2 rs485
Absolutely, and will be a good way for you to learn about micros.
For RS485 you will only need 1 port on the master - you can daisy chain multiple slaves with RS485. However the software will be a bit more complicated because you have to address each slave differently. If you...
I assume he means very low ESR.
You'd be surprised. In some case you would derate by 20% or more at 6000 ft. This becomes more significant when you are using manufactured equipment (variable speed drive for example) and you are pushing it close to the limit.
If I remember my opamp theory correctly, you should have the + input connected to 0V which means that the opamp will maintain the voltage at the - input to 0V, which means that one side of the capacitor is connected to the output and the other side effectively connected to 0V. This means that...
A LDO is a linear regulator. For a linear regulator, the input voltage has to be at least a few volts higher than the output for it to function. With an LDO the input still must be higher than the output, but requires less "extra" volts than a regular linear regulator. You can think of an LDO as...
It depends on the current you require on the 5V. If the current is not too high, you can use a linear regulator like the 7805. You don't need to use a LDO. If the current is high then you will have to use a switching supply or otherwise a big heatsink with a linear regulator. If you choose a...
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