Circuit 7: How to design a 13.56mhz sine wave power amplifier circuit with 2N3904.Circuit 6: 2N3904 Sample Circuit-Amplifier.CatalogĬircuit 1: Thermostat controller composed of LM75 intelligent temperature sensor and 2N3904 transisitor Hope these circuit diagrams are helpful to you. These circuit diagrams are basically beginner-friendly types.

Note that you need to find B for the transistor from its datasheet.In this blog, Apogeeweb has prepared 8 simple 2N3904 circuits for electronics enthusiasts. Show calculations for obtaining the value of the constant resistor and the potentiometer:ĭetermine the Q-point values (write down your calculations in the space provided) and fill the Design column of Table 1, for 18 = 100 JA.

The constant resistor should guarantee that the base current should never exceed 200 uA (which is the case when the potentiometer is set to 0 2). So, the minimum of 1g corresponds to maximum of Rs and vice versa). Show calculations for obtaining the value of Rc Pot Re: Use a combination of a potentiometer, Potų, and a constant resistor, RB1 in series as the total base resistor, Rg, such that the base current, Ig, may be varied from 25 to 200 uA (note that 1, V-V). Note also that at this point you do not need to know or calculate the value for Rp. Pick up a norm resistor value using 10% tolerance. Your circuit should place a fixed collector resistor, Rc, in the circuit to prevent the collector current, Ic, from exceeding 40 mA (for this, you know that the minimum value of Vce is zero). (Hint: Use average value, see the document in lab folder for Calculating Br value from datasheet for 2N3904.) Bp Voc +10 v RB RE We are going to consider the common-emitter configuration circuit shown in the figure to test a 2N3904 npn Bipolar Junction Transistor (BJT) under DC bias conditions. Download the datasheet for 2N3904 and find the value of Bp.

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