The PCB design, which resembles the project ” RMS 250W auto amplifier JBL filter SMPS EI35 SG3525 ” that was previously shared, is a fairly regular Auto Amplifier circuit . You can use 2x100w rms stereo or 200w rms mono, which can be controlled by bridge connection as well as bass control with cross over circuit with adjustable TL072P op amp at the main entrance floor .
TIP147 TIP142 darlington transistors are used on the power of the amplifier, and BDW83C, BDW84C can be used instead .
The symmetrical + 35v -35v TL494 DC DC converter circuitry required for auto anfin operation is provided. The supply of the cross over circuit is regulated by + -35V TIP41C TIP42C transistors (+ -15V)
The power traf is EI33, located at AT, ATX power supplies. A lot of articles have been shared about the use of this transformer. In this application, the method of using transformer was made as mentioned in the article ” DC DC Converter 200W 2X30V SG3524 SG3525 Using EI33 Transformer “. The MOSFETs IRF1010N driven at the output of TL494 can be replaced by IRF3205, IRFZ44, 50N06 .
The “REM” section on the DC DC power supply circuit with TL494 PWM control integration. A cable from the ignition wire of the car will be pulled in. This section allows the system to be closed when the car is not running. If you want to use an external 12v DC source other than the car, you need to give + 12v to the “REM” section.
200W DARLINGTON ANFI CROSS OVER CIRCUIT DIAGRAM
TL494 DC DC CONVERTER CIRCUIT SCHEMATIC
200W AUTO AMPLIFIER TEST
- 8.0 V to 35 V Operation
- 5.1 V 1.0% Trimmed Reference
- 100 Hz to 400 kHz Oscillator Range
• Adjustable Deadtime Control
• Input Undervoltage Lockout
• Latching PWM to Prevent Multiple Pulses
• Pulse−by−Pulse Shutdown
• Dual Source/Sink Outputs: 400 mA Peak
• Pb−Free Packages are Available*