Pin 1. The emitter is for an external drive of current. Pin 2. The base administers the biasing of the transistor. It vagaries the state of the transistor. Pin 3. The collector is for the current inside drive.
It is related to the load. Product Attribute. Attribute Value. Product Category:. Bipolar Transistors - BJT. Mounting Style:. Through Hole. Transistor Polarity:. Collector-Emitter Saturation Voltage:. Maximum DC Collector Current:. Pd - Power Dissipation:. Gain Bandwidth Product fT:. Minimum Operating Temperature:. Maximum Operating Temperature:. Continuous Collector Current:.
Product Type:. BJTs - Bipolar Transistors. When the button is pressed at certain time, the voltage V2 forms a closed loop with base-emitter of transistor as can be seen in circuit diagram. With this closed loop a current flows through base of transistor and with base current flow the transistor gets turned ON. Having transistor acting as short circuit in ON state there will be collector current which flows through motor making it rotate.
This motor will keep rotating until there will be base current. After a certain time when the button is released the base current becomes zero and the transistor gets turned OFF.
With transistor going to high resistance state in OFF mode, the collector current also becomes zero bringing motor to stop. The way of controlling power motor via simple push button realizes the use 2N as a switching device and in the same way we can use 2N in other transistor circuits.
Dear Swagatam, I must thank you for your very interesting and educational website, as well as your comprehensive responses to clients. I had a quick question. I have installed them on top of a big aluminum box, so as to function as a heat-sink. Moreover, there is a fan installed on top, which cools the box. I am planning to add another 2N as a parallel transistor, alongside the already present 2N; and I am not sure how to go about this.
The following is the description of the whole circuit diagram: 1. Base of the 2N is connected to the output of the IC Collector of the 2N goes to the input of the IC I get 6v from the emitter of the Tr. Common pin of goes to the ground through a 1N diode. Both the input and output pins of IC connect to the ground through a10uf and a nf capacitors on each side. Would it be enough if I connected the B, C, and E of the two aforementioned transistors together with pieces of wire?
Thank you very much in advance for your attention! All the best, Jack. Thank you Jack, yes definitely you can add another 2N in parallel with your existing 2N by directly joining their EBC pins together. Just make sure to mount them close to each other and over a common single aluminum heatsink. If your box is made up of aluminum then you can mount the new transistor just beside your existing transistor.
No other modifications would be required. Dear Swagatam, hello Thank you very much for so soon response and valuable suggestion, as well. All the best Jack. Dear Jack, you can use TIP35 for both the transistors, which can greatly enhance the current handling capacity of the design.
You also consider using only one TIP35 in place of the existing 2N and check if that helps you to get the required full current output.
Dear Swagatam Hello Thank you so much for your precious response. Dear Swagatam, Hope you are doing well! Just to test things out, I added another 2N as parallel to the already existing 2N of the current circuit ; over a separate aluminum heat-sink.
However, the output voltage with load increased to 3,5V only; meaning a mere 0. I added another 15V, 3A power supply same as the current power supply , as a parallel to the input of the circuit to see if the output voltage increases to 6V. This time, the output voltage increased to 3.
I did the installation of the second transistor over another aluminum heat-sink to see if the voltage would increase, yet it did not happen.
I would be very glad if you would kindly tell me if you think that mounting the second 2N over the common, single aluminum heat-sink box and close to the present 2N would increase the output voltage to 6V, or if I should do as your instructions and use TIP35 ones? Thanks a lot for all your help! Best regards, Jack Smith. Parallel transistors are used to increase current not the voltage. In your initial question you said you wanted to increase the output current, right? If you want to increase the output voltage then you must use 1N diodes in series with the ground pin.
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