![]() The most commonly constructed amplifier classes are those that are used as audio amplifiers, mainly class A, B, AB and C and to keep things simple, it is these types of amplifier classes we will look at here in more detail. The second set of amplifiers are the newer so-called “switching” amplifier classes of D, E, F, G, S, T etc, which use digital circuits and pulse width modulation (PWM) to constantly switch the signal between “fully-ON” and “fully-OFF” driving the output hard into the transistors saturation and cut-off regions. ![]() The first are the classically controlled conduction angle amplifiers forming the more common amplifier classes of A, B, AB and C, which are defined by the length of their conduction state over some portion of the output waveform, such that the output stage transistor operation lies somewhere between being “fully-ON” and “fully-OFF”. The classification of amplifiers range from entirely linear operation (for use in high-fidelity signal amplification) with very low efficiency, to entirely non-linear (where a faithful signal reproduction is not so important) operation but with a much higher efficiency, while others are a compromise between the two.Īmplifier classes are mainly lumped into two basic groups. Then Amplifier Classes is the term used to differentiate between the different amplifier types.Īmplifier Classes represent the amount of the output signal which varies within the amplifier circuit over one cycle of operation when excited by a sinusoidal input signal. One method used to distinguish the electrical characteristics of different types of amplifiers is by “class”, and as such amplifiers are classified according to their circuit configuration and method of operation. A typical loudspeaker has an impedance of between 4Ω and 8Ω, thus a power amplifier must be able to supply the high peak currents required to drive the low impedance speaker. Generally, large signal or power amplifiers are used in the output stages of audio amplifier systems to drive a loudspeaker load. The main operating characteristics of an ideal amplifier are linearity, signal gain, efficiency and power output but in real world amplifiers there is always a trade off between these different characteristics. There is a clear distinction made between amplifier classes as too the way their output stages are configured and operate. Please visit this page for detail explanation from author, schematic diagram and PCB layout of mini AM Rradio receiver circuit.Not all amplifier designs are the same. ![]() Remember that this is the lower (solder) side, by viewing the top image you should be able to match up the positions of all components. Note that this is reverse so the veropins appear now on the left hand side at the top. The image below is an actual size (scale= 1:1) copy of the copper layer. If connections on the capacitor are reversed, then moving your hand near the capacitor will cause unwanted stability and oscillation. The moving plates should be connected to the “cold” end of the tank circuit, this is the base of Q1, and the fixed plates to the “hot end” of the coil, the junction of R1 and C1. The tuning capacitor has fixed and moving plates. The design is simple and sensitivity and selectivity of the receiver are good.Īll connections should be short, a veroboard or tagstrip layout are suitable. It is similar in principle to the ZN414 radio IC which is now replaced by the MK484. The circuit use a compact three transistor, regenerative receiver with fixed feedback. This is the circuit diagram of mini AM Radio receiver.Īll general purpose transistors should work in this circuit, you can use BC549 transistors for this circuit.
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