AlexM
Редовен Потребител
Противоискров укротител 
опитомител.Някой знае ли как се прави или от къде да си купя.Трябва ми за 5.5мм булет конектор.
................мерси намерих си информация.............
На някой ако му е интересно да я преведе.
Yes, you can retrofit any ESC to add a spark arrester. All you need is a set of bullet connectors, a short piece of wire and a resistor. You want to choose a resistor that gives you an RC time constant of about 1 second. It takes 5 time constants for a capacitor to charge up through a resistor, so if you pick a 1 second time constant, it takes 5 seconds for the system to charge up, and this is the right amount of time to allow to minimize the spark and not take too long to charge up.
Here is what you do:
Step 1. Determine the resistor value.
Since capacitors are normally rated in Micro Farads (1 millionth of a Farad) if you take 1,000,000 (one million) and divide that by the size of the capacitor, it will give you the resistor value required, in ohms, to get a 1 second time constant. For example, if your ESC has 2 capacitors on it, and each one is a 330 uF value, the two of them together is 660 uF. If you take 1,000,000 and divide it by 660, you get a result of 1515 ohms. Resistors come in standard values like 1000, 1200, 1500, 1800, 2200, 2700, 3300, 3900 and so on, so you will need to select the closest standard value to what you calculate. In this case, we calculated 1515 ohms, and the nearest standard value would be 1500 Ohms, so that is what you would use.
The resistors also come in a variety of wattage ratings such as 1/8 watt, ¼ watt, ½ watt, 1 watt and so on. This is the maximum amount of power that the resistor can handle safely, and also determines the physical size of the part. Also, the larger the wattage rating of a resistor, the larger the lead wires it has, so that comes into play as well. The most power the resistor will see is when you first plug it in. Initially, you will have the full battery voltage across the part, and this will decrease as the capacitors charge up. To calculate the power in a resistor as a function of voltage, it is equal to Voltage squared divided by Resistance. In this case, lets assume a 6-cell Li-Po battery, which will have about 25 volts when fully charged. If we square 25 or take 25 x 25 we get 625. Now if we take 625 and divide that by the size of our resistor, which is 1500 ohms, we get 625/1500 which is 0.417 watts. We always go the next size larger on the resistor, so we would go up to a ½ watt resistor for this case.
Now we have determined that if the ESC has a pair of 330 uF capacitors, and we have a 6-cell Li-Po battery, then we need a 1500 ohm, ½ watt resistor. Pretty easy calculation if you know the math.
Step 2: Modify the ESC power lead.
Normally we cut the red lead somewhere in the middle and remove enough wire to allow for the body of the bullet connector. The size bullet connector used depends on the amp rating of the ESC. For ESC’s in the 20 to 55 amp range, a 3.5mm bullet connector is fine. For 60 to 100 amp ESC’s a 4mm bullet connector is adequate, for 100 to 150 amp ESC’s a 6mm bullet connector should be used.
After you cut the read lead and get the ends of the wires prepped for soldering, you also need to add the jumper wire. This wire can be much smaller than the power lead, since it only needs to handle the charge current of the capacitors. Normally something around a 20 ga or 18 ga wire is used. This wire is usually cut about 5 or 6 inches long, to allow it to loop back around to connect to the bullet connectors.
Strip one end of this wire and twist it around the end of the power lead that goes to the Deans connector. Then solder both of these wires into the male end of the bullet connector you are going to use in the middle of the wire. After you are done soldering, put some red heat shrink over the bullet connector.
Step 3. Add the resistor
No you can take the resistor and cut the leads so you only have about ½ inch sticking out each end. Solder the red lead that comes from the ESC into the female end of the bullet connector. After that is done, heat up the side of the bullet connector and put a dab of solder on it. Bend the lead on one end of the resistor so it angles down to go into the little solder blob you put on the side of the bullet connector and solder the resistor in place. Then take the other end of the small wire and solder it to the remaining wire on the resistor. You can put a small piece of heat shrink on the wire before you solder, big enough to fit over the resistor to help reinforce this solder joint. After you are done soldering, put a large piece of heat shrink over the bullet connector and resistor to finish the job. When finished, everything should look like this. You can see the resistor under the heat shrink on the female connector.
http://scriptasylum.com/rc_speed/nospark.html
опитомител.Някой знае ли как се прави или от къде да си купя.Трябва ми за 5.5мм булет конектор.................мерси намерих си информация.............
На някой ако му е интересно да я преведе.
Yes, you can retrofit any ESC to add a spark arrester. All you need is a set of bullet connectors, a short piece of wire and a resistor. You want to choose a resistor that gives you an RC time constant of about 1 second. It takes 5 time constants for a capacitor to charge up through a resistor, so if you pick a 1 second time constant, it takes 5 seconds for the system to charge up, and this is the right amount of time to allow to minimize the spark and not take too long to charge up.
Here is what you do:
Step 1. Determine the resistor value.
Since capacitors are normally rated in Micro Farads (1 millionth of a Farad) if you take 1,000,000 (one million) and divide that by the size of the capacitor, it will give you the resistor value required, in ohms, to get a 1 second time constant. For example, if your ESC has 2 capacitors on it, and each one is a 330 uF value, the two of them together is 660 uF. If you take 1,000,000 and divide it by 660, you get a result of 1515 ohms. Resistors come in standard values like 1000, 1200, 1500, 1800, 2200, 2700, 3300, 3900 and so on, so you will need to select the closest standard value to what you calculate. In this case, we calculated 1515 ohms, and the nearest standard value would be 1500 Ohms, so that is what you would use.
The resistors also come in a variety of wattage ratings such as 1/8 watt, ¼ watt, ½ watt, 1 watt and so on. This is the maximum amount of power that the resistor can handle safely, and also determines the physical size of the part. Also, the larger the wattage rating of a resistor, the larger the lead wires it has, so that comes into play as well. The most power the resistor will see is when you first plug it in. Initially, you will have the full battery voltage across the part, and this will decrease as the capacitors charge up. To calculate the power in a resistor as a function of voltage, it is equal to Voltage squared divided by Resistance. In this case, lets assume a 6-cell Li-Po battery, which will have about 25 volts when fully charged. If we square 25 or take 25 x 25 we get 625. Now if we take 625 and divide that by the size of our resistor, which is 1500 ohms, we get 625/1500 which is 0.417 watts. We always go the next size larger on the resistor, so we would go up to a ½ watt resistor for this case.
Now we have determined that if the ESC has a pair of 330 uF capacitors, and we have a 6-cell Li-Po battery, then we need a 1500 ohm, ½ watt resistor. Pretty easy calculation if you know the math.
Step 2: Modify the ESC power lead.
Normally we cut the red lead somewhere in the middle and remove enough wire to allow for the body of the bullet connector. The size bullet connector used depends on the amp rating of the ESC. For ESC’s in the 20 to 55 amp range, a 3.5mm bullet connector is fine. For 60 to 100 amp ESC’s a 4mm bullet connector is adequate, for 100 to 150 amp ESC’s a 6mm bullet connector should be used.
After you cut the read lead and get the ends of the wires prepped for soldering, you also need to add the jumper wire. This wire can be much smaller than the power lead, since it only needs to handle the charge current of the capacitors. Normally something around a 20 ga or 18 ga wire is used. This wire is usually cut about 5 or 6 inches long, to allow it to loop back around to connect to the bullet connectors.
Strip one end of this wire and twist it around the end of the power lead that goes to the Deans connector. Then solder both of these wires into the male end of the bullet connector you are going to use in the middle of the wire. After you are done soldering, put some red heat shrink over the bullet connector.
Step 3. Add the resistor
No you can take the resistor and cut the leads so you only have about ½ inch sticking out each end. Solder the red lead that comes from the ESC into the female end of the bullet connector. After that is done, heat up the side of the bullet connector and put a dab of solder on it. Bend the lead on one end of the resistor so it angles down to go into the little solder blob you put on the side of the bullet connector and solder the resistor in place. Then take the other end of the small wire and solder it to the remaining wire on the resistor. You can put a small piece of heat shrink on the wire before you solder, big enough to fit over the resistor to help reinforce this solder joint. After you are done soldering, put a large piece of heat shrink over the bullet connector and resistor to finish the job. When finished, everything should look like this. You can see the resistor under the heat shrink on the female connector.
http://scriptasylum.com/rc_speed/nospark.html
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