I would be glad if you could help me understand this.
I used DS and tried with all possible numbers and I still can not fit in to get a valid solution. I do not have any parameters that I would be able to reach 10R resistors at all. I know that the voltage of the base must be about 0.7V, and also the base current would have to be 0.7A or I’m wrong. In one half I found that the PNP MJ2955 transistor located in front of the IC LM317T has a resistor based on 10R (I do not know the power), so in the end I get 20R power to 7A. The LM31T gives max 1.5A, I want to increase or decrease this value. I use the semicolon with the LM317 IC and I have 22VAC, some 31VDC after the condenser and in the wheel. Like most people, I’m reporting this because of Rb-based resistors. Respect, sir! I have a problem with a regulator and I think you can best help me. The electronic components needed are a regular color banded 5-band resistor, the bands represent the Ohm value, resistor tolerance and in some cases temperature coefficient. Ohms law: Base resistor = (Supply voltage – Voltage drop) / (Collector current / Beta) Formulas and math used for the transistor base resistor calculator To help you remember the pinout of the NPN and PNP transitors: NPN transistor and PNP transistor with base resistorĮxamples are given for NPN transistors 2N2222, 2N3055, 2N3904, BC547, TIP31, TIP31A, TIP31C, TIP41, TIP41A, TIP41C and PNP transistors 2N3906. To calculate for a PNP transistor, enter negative numbers in collector current, base voltage and voltage drop.Values for your circuit might vary, be sure to enter values for your own needs. For example, it is here given for the highest collector current and worst case amplification factor, Hfe.As a result you get a base resistor value half of what this calculator gives you. To insure to turn the transistor fully on, you can double the value for collector current.To get the best result, consider the following Voltage drop is the Vbe(sat) value, you will get this from the datasheet looking at the graph for Vbe and Vce(sat) vs.Base voltage is the voltage that you use to drive the base of the transistor with.Vce voltage is the voltage across collector and emitter.To calculate for the worst case, use the minimum Hfe value or the correct value, for the collector current you need. These values is in the datasheet for the specific transistor. Secondly, find the current gain, beta, Hfe.First, calculate the current you need to pass through the transistor when its on, that is your collector current.To use the calculator for transistor base resistor values, Its IMPORTANT that you read the following. Musical Tesla Coil Interrupter for SSTC/DRSSTC.Busbar and primary circuit design for Tesla coils and inverters.Rectifier Selection for Tesla Coils and Inverters.Topload design and selection for Tesla coils.
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