Fool 175, 275 sets successfully put the module
The fool 175, 275 sets the successful amplifier module The integrated circuit module called "fool IC" is also called the "one-foot" power amplifier circuit by enthusiasts. Its output stage uses N-channel and P-channel insulated gate field effect transistors, which has the characteristics of wide dynamic frequency response, wide power supply voltage range and beautiful output sound. On the internal circuit of the integrated block, overvoltage, overheating automatic protection and self-recovery circuit devices are also designed. There is no need to connect external components such as resistors and capacitors. Even if you do n’t know the electronic circuit, connect the speaker and connect the DC power supply, the audio equipment can work conveniently.
"Fool" power amplifier has single output (fool 175), dual output (fool 275) and different power output and other specifications. The main technical parameters of the fool amplifier are listed in the attached table 1-18.
As can be seen from the parameters in the table, they can all work as usual when the power supply voltage changes twice. After adding the heat sink, it can have a maximum output of 75W. The application circuit of the "fool" power amplifier is shown in Figure 1-26. The figure shows two application circuits of 175 power amplifier and 275 power amplifier. As you can see from the picture, there is no need to connect any components other than the speaker power supply, which is very convenient to use.
Pay attention to the following when applying.
(1) Fool power amplifiers do not have high requirements for power supply, and can be directly powered by full-bridge rectification. When the voltage is over, the circuit will automatically stop working, and when the voltage drops to the normal value, the circuit can automatically resume working.
(2) The aluminum heat sink should be connected as required. Because the heat sink is electrically isolated from the internal circuit, the heat sink can directly contact the housing. It is best to apply a layer of silicone grease during installation to ensure good contact with the heat sink.
(3) Do not bundle the various leads connected to the integrated block to prevent the coupling between the lines and generate self-excitation. They should be loosely distributed. The input signal line is preferably a metal isolation line to prevent AC noise from being induced by alternating current.
175, 275 power amplifier circuit
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