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Post by Deleted on Nov 12, 2007 2:18:31 GMT -8
I have constructed the circuit of LT1372 according to Gary's However, i found that it is not giving a constant output but a output according to the input e.g input =5V, output=4.7V the output is just a bit smaller than the input I have checked there is not wrong connections and repeat the connections for a few times. Also, I am going to construct the circuit according to the picture below www3.telus.net/chemelec/Projects/Voltage-Boost/LT1372-2.jpgIs the black button on the left the variable resistor? how about the orange and black components next to the LT1372? And which is the coil? THX! |
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Post by Gary Lecomte on Nov 12, 2007 17:11:50 GMT -8
It Isn't a Black Button, Its a TRIMPOT. (Variable Resistor.) Orange component is a capacitor. Do you have a PROPER COIL? Coil is the long Black thing on the Right side. This Circuit DEFINATELY WORKS, if you build it right with the correct parts. Gary *************************************************** I have constructed the circuit of LT1372 according to Gary's However, i found that it is not giving a constant output but a output according to the input e.g input =5V, output=4.7V the output is just a bit smaller than the input I have checked there is not wrong connections and repeat the connections for a few times. Also, I am going to construct the circuit according to the picture below www3.telus.net/chemelec/Projects/Voltage-Boost/LT1372-2.jpgIs the black button on the left the variable resistor? how about the orange and black components next to the LT1372? And which is the coil? THX! |
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Post by Deleted on Nov 13, 2007 9:33:16 GMT -8
It Isn't a Black Button, Its a TRIMPOT. (Variable Resistor.) Orange component is a capacitor. Do you have a PROPER COIL? Coil is the long Black thing on the Right side. This Circuit DEFINATELY WORKS, if you build it right with the correct parts. Gary I have tried the 4.7uH/10uH inductor from coilcraft Why the capacitor next to the LT1372 is so differnet in appearance? is it some other type of capacitor? I have just used the ceramic for 0.047u, 0.0047u, can i? Morever, can i test this circuit on breadboard or prototype board? Or I must etch a PCB for it? I think i should try it again |
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Post by Gary Lecomte on Nov 13, 2007 19:12:14 GMT -8
That Orange one is a .047 Mylar cap, But it really doesn't matter. A Disk Cap should also work fine. Coilcraft Coil Tells me Nothing. They make Many types of Coils. What is the Current capability of it? Is it a Hash Choke? It should be Fairly Large, like the one on my board. It worked for me on a Breadbaord also. Gary ********************************************* It Isn't a Black Button, Its a TRIMPOT. (Variable Resistor.) Orange component is a capacitor. Do you have a PROPER COIL? Coil is the long Black thing on the Right side. This Circuit DEFINATELY WORKS, if you build it right with the correct parts. Gary I have tried the 4.7uH/10uH inductor from coilcraft Why the capacitor next to the LT1372 is so differnet in appearance? is it some other type of capacitor? I have just used the ceramic for 0.047u, 0.0047u, can i? Morever, can i test this circuit on breadboard or prototype board? Or I must etch a PCB for it? I think i should try it again |
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Post by Deleted on Nov 13, 2007 23:46:17 GMT -8
That Orange one is a .047 Mylar cap, But it really doesn't matter. A Disk Cap should also work fine. Coilcraft Coil Tells me Nothing. They make Many types of Coils. What is the Current capability of it? Is it a Hash Choke? It should be Fairly Large, like the one on my board. It worked for me on a Breadbaord also. Gary ********************************************* I have tried the Axial Lead Power Chokes from coilcraft PCH-45-472L 4.7uH PCH-27-1-3L 10uH www.coilcraft.com/pch.cfmI have also tried the recommended inductor from the datasheet of LT1372, the result is the same I have observed the phenomana is that, LT1372 HAVEN'T done any voltage step up When I measure the output before the diode, it is the same as the input after crossing the diode, the output dropped about 0.4-0.5V That's why I found the output is nearly the same as input. I have tried both on breadboard or prototypeboard, the result is the same. |
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Post by Gary Lecomte on Nov 14, 2007 11:58:42 GMT -8
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