Cars are charged with high and high-quality sound. I think the most important part of these systems is auto amplifiers. With the ebilir switch mode “method, we can obtain the desired voltage from the car’s 12volt battery. The heart of the circuit that operates with the switch mode method is the SG3525 integration. The second important part in this circuit are the coils we will wrap.
2 coils are used in the circuit. The first one is the TR1 coil with high voltage and the other one is the TR2 coil used to suppress the generated frequency. Both bobbins are wound on a standard 4cm diameter core with 1mm enameled wire. TR1 coil consists of primary and secondary windings. Secondary output is taken from the circuit by giving frequency to circuit.
If the primary winding is 2 x 4 turns and the secondary voltage is 2 x 13 turn for 2 x 35volt and 2 x 17 turns for 2 x 42volt. TR2 coil is wound in 2 x 30 turns. When winding the coils, the winding directions must be observed. 2 x 35 volts are suitable for TDA7294 amplifier integration. Or the required voltage within a noise-amplified amplifier can be adjusted.
Voltage is of course not everything. Current is also required if we want to take power. This is the BUZ11, which triggers the TR1 coil that we use in the circuit. The number of mosfets used is determined according to how much power we take. For example, I used 4 TDA7294 in my own time. So in order to get 4 x 100W 2 x 4 pieces of BUZ11 mosfetleri. In the tests I did, I was able to give power in cool but saturated sounds without cooling. But high sounds require good cooling.
Since the voltage from the TR1 in the switch mode power supply is the frequency-loaded AC voltage, the standard diodes are not used to rectify this. Ultra-fast diodes are used. The recommended circuit is BYW29 diode. I had a problem with BY233. All mosquitos and diodes must be insulated when screwed into the cooler.
The circuit also has a portion that controls the output voltage. These are provided by opto-coupler elements. In addition, the output voltage can be adjusted with the trimpot in the circuit.
The SG3525 has a-shut-down SG output. The circuit remains in the shut-down position unless it outputs to + 12volt. So we have to give + 12volt here on our circuit.
The car amplifier controls the bin remote, output of the car stereo. When the auto recorder is switched on, it gives a signal to the Auto amplifier and the amp turns on. To achieve this, there is a simple transistor circuit added to the circuit. Below you can see the open diagram of this circuit.