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Combine, they provide a regulated 12V DC at a relatively low current.Īfter this, the signal is passed through a current amplifier (2N3305) in common base configuration to boost the current to 3A DC with the base reference voltage acting through a Zener diode voltage regulator. Here, a 680Ω resistor acts as a current limiting voltage source. The signal then passes through a voltage regulator section using a 12V Zener diode. The BD139 should preferably be selected for high gain to minimise distortion. Notes to Table 1: The 2N3055 should be epitaxial-base type with high f T (preferably 4 MHz) The 2 x TIP3055 are a parallel pair with 0R1 emitter resistors. After which the signal passes through a smoothing capacitor C1 (5000μF) to remove any undesirable noise. 2N3055 is a very old design transistor, older than a LM555 and there are more efficient power transistor around. Commonly available or preferred transistor substitutes. Transistor 3904 is an NPN transistor while 3906 is a PNP transistor as shown below in the figure.On providing an AC input from a 230V/15V 5A non-CT transformer, The stepdown AC signal passes through a bridge rectifier which translates the AC signal into a rippling DC. The basic difference between 2N3904 and 2N3906 is the only type of transistor. It is also used in amplifier up to the frequency of 100MHz.
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How this circuit works is through the RC network of the resistor and capacitor. The transistors are both 2N2222, which are BJT NPN transistors.
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So we use 2 transistors in this circuit for operation. The astable multivibrator circuit we will build with transistors is shown below.
#What is a 2n3055 transistor used for series
Biasing current should maximum of 5mA more than 5mA will damage the Transistor so a resistor is always added in series with the base pin of the transistor. 2N3904 transistor acts as an Open Switch during forwarding Bias and acts as a closed switch during Reverse Bias. When it is used as a switch it is operated in the Saturation and Cut-Off Region.