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TRANSISTOR AMPLIFIER DRIVER

Thus, The base voltage of Q1 will be about half of the supply voltage. Then, see R1, R2 and R6 are voltage divider circuit. Third, the OUTPUT stage Q3 and Q4 will be a negative feedback, causing 100% feedback, thus the DC gain ratio is 1.

TRANSISTOR AMPLIFIER DRIVER

Second, DRIVER stage, Q2 is connected with the common-emitter, and directly connect with Complementary common-collector amplifier by Q3 and Q4.

How does it worksįirst see INPUT stage, Q1 acts as a voltage amplifier in direct coupling mode. It has a frequency response of 44Hz to 33,100Hz, can accept an input signal of up to 1 Vp-p, and is suitable for the power supplies of 18V to 22V. It was also used as a booster circuit for cassette radio receivers. Which can increase the power for a speaker by about 4 to 6 watts. We change some devices and increase the supply voltage level. This is a 5 watts Audio Booster circuit using 4 transistor. If this circuit gives you too little power. In all, these combined 4 transistors projects should give you hours of fun. Although, this 4 transistor audio amplifier circuit is ancient, it still suitable for children’s learning and good sound. Your signal tracer will indicate which transistor is providing this gain. If the input about 250mV, the amplifier needs to provide a gain of about 40 to 80 times. Thus, this gain of amplifier about 20 x 20 x 20 or 8,000 times! But this is not so. Obviously, all the step cannot provide the good amplifier, since a transistor has a gain of at least 20 times, and sometimes an in-circuit gain of 100.

You may like to trace through the amplifier with the signal tracer project. When you complete soldering, Next, connect the battery via a milli-ammeter to check, that the current is within 30mA and most probably is 5-15mA with no input signal. With care you will find you will not have to cut any of the universal PCB Board tracks and most the parts will fit neatly onto the board as they all 0.1” spacing.įor my son plan will build it on wood board or hard paper it also saving money and fun amazing! Make a layout diagram first which very nearly follows the schematic diagram before attempting any soldering. Or You can assemble the amplifier circuit on A small piece of universal PCB Board 20 – 25 holes. This circuit is a small size you can assemble them on the breadboard. Look: A lot of Power supply circuit Build the 9V mini amplifier Do you have this one? If you do not have it. This circuit requires enough power supply.

B1: 9-volt batteries Or 9V power supply circuit.

Q2,Q4: BC557 or equivalent, 45V 0.1A, PNP Transistor.

Q1,Q3: BC547 or equivalent, 45V 0.1A, NPN Transistor.

2N3055 Amplifier Circuit with PCB | 60W.

40W transistor audio amplifier circuit with PCB.

The 100uF electrolytic protect DC from appearing on the speaker, the require the speaker to oscillate around this new position. This needs to reduce cross-over distortion which occurs whenever two transistors are connected in push-pull. There is a voltage differential of 0.6V between their base and emitter leads. Recommended: 3 transistor audio amplifier circuit The emitter voltage of 0.6V less than this, and will be 4.9V.Īnd next, The Q2-transistor is biased so that it provides a voltage across the 270 ohms load resistor, which will give the output transistors. This provides the base with a bias voltage of 5.5V. Then, at Q1 the bias of the whole circuit commences with the voltage divider made up of the 56K and 100K resistors. Next, the Q1 and Q2 transistors run as a pre-amp to increase the incoming voltage to drive the output pair. Each output transistor deals with one half of the audio cycle, one being cut-off when the other conduct. Both transistors Q3 and Q4 are arranged as a complementary pair operating in push-pull.