Required Components for Power Amplifier Circuit The combination of these two provides 100 Watt RMS power output across the 4 Ohms Load. In final stage, two Power MOSFETs IRFP244 and IRFP9240 are used. The Pinout diagrams for both of them are given below. MJE340 has the same specification as MJE350, but it is an NPN medium power transistor. MJE350 is a 500 mA PNP transistor in the TO-225 package and the identical NPN pair Transistor is MJE340. We used two complementary Medium Power Transistors MJE350 and MJE340. The pin out of the MPSA43 NPN transistor is. It is a high voltage NPN transistor which acts as an Amplifier. In the amplifier’s amplification stage, we used high voltage transistor MPSA43. Let’s see the specification and pin diagram of important MOSFETs and transistors. In the construction of 100 Watt Amplifier, Multiple Transistors and MOSFETs are used. But in this tutorial, we will design a 100 Watt RMS output power amplifier using MOSFETs. In previous tutorials, we made 10W power amplifier, 25W power amplifier and 50W power amplifier. So, we need to be careful about the speaker rating, amplifier rating, speaker efficiency, and impedance.Ĭonstruction of Simple 100W Audio Amplifier Circuit Also, we need to understand that, a amplifier with 5 Watt, 6 Watt or 10 Watt or even more is the RMS (Root Mean Square) wattage, delivered by the amplifier to a specific load in continuous operation. There are different choices as well as different segment of speakers are available in the market, generally with 4 ohms, 8 ohms, 16 ohms, and 32 ohms, out of which 4 and 8 ohms speakers are widely available in cheap rates. If the pipe gets bigger in diameter, the impedance will be low, so the speaker can get more wattage and the amplifier provide more power transfer scenario and if the impedance gets high then the Amplifier will provide less power to the speaker. The diameter is the effect created by the ohmic resistance and reactance. Now, if the pipe became bigger in diameter, the water will easily flow through the pipe, the volume of water will be bigger, and if we decrease the diameter, the less water will flow through the pipe, so the volume of water will be lower. Just think loudspeaker as a water pipe, the water flowing through the pipe is the alternating audio signal. Speaker impedance can be best understood using the relation between water flow inside a Pipe. In Audio electronics, different types of Loudspeakers are available in different wattage with different impedance. Impedance is the effective resistance of an electronic circuit or component for alternating current, which arises from the combined effects related to ohmic resistance and reactance. Power amplifier delivers AC output, due to this the impedance of the speaker is a critical factor for proper power transfer. Loud Speaker is a huge load which acts as an Inductive and Resistive load. Power amplifier output depends on the load impedance, so connecting an improper load could compromise the efficiency of the Power amplifier as well as the stability. The major load for a power Amplifier is the Loud Speaker. In case of Audio Amplifier system, the load and the load driving capacity of the amplifier is an important aspect in construction. Also, in some cases, where tone control is needed, the tone control circuitry is added before Power Amplifier. Generally, before Power Amplifier, the signal is corrected using Pre Amplifiers and Voltage controls amplifiers. As you can see in the above block diagram, Power Amplifier is the last stage which is directly connected to the load.
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