diyAudio - Finished Car Amplifier schematic + PCB based on Kenwood KAC-716

Finished Car Amplifier schematic + PCB based on Kenwood KAC-716

This Project is “Car amplifier” and its basic parts- SMPS, Amplifier, Preamplifier and Protection circuit witch are based on originally schematic from service manual of Kenwood Car amplifier KAC-716.
I have work on this project about five mounts and it WORKS.
From originally schematic of KAC-716, I have made PCB’s separately for SMPS, Amplifier, Preamplifier and Protection sow it can be build very easy.
All electronics capacitor from Amplifier, Preamplifier and Protection are 50 volts range. Input capacitors 2x 3300uf/16volts and output capacitors 2x2200uf/50volts and additionally 2x1500uf/50volts should have 105 C temperature ranges.
All documents are in PDF format and JPEG. The PCB’s are in original sizes.
The SMPS is not regulated so the output voltage will depend on turns ratio in ferrite core. I used 2 x 4 turn’s primary wire and for second it depends of why high will be the output voltage.
By choosing a proper resistance for resistor R222/1W connected with pin 6 of UPC1237 we must set up maximum current of 80mA. The valley of R222 depends of internal resistance of relay and supply. For better calculation download the datasheet for UPC1237 form Internet-Read the note for using UPC1237 and you can understand what kind of other protections are given from this IC’s and used in this design.

The amplifier has specifications:

Max Power Output (4ohm)………………………….. 240Wx1 (at 100Hz)
Rated Power Output (4ohm)………………………....120Wx1 (0.08% THD at 100Hz)
Rated Power Output (4ohm)………………………... 160Wx1 (0.8% THD at 100Hz)
Signal to Noise Ratio……………………………….. 100dB
Sensitivity (MAX)………………………………….. 0.15V
Sensitivity (MIN)…………………………………... 4.0V
Input Impedance…………………………………….10Kohm
Low-Pass Filter (12dB/oct.) ………………………. 30-200Hz (Variable)
Operating Voltage…………………………………..14,4V (11~16V allowable)
Current Consumption (1 kHz, 10% THD, 4ohm)…..15A

Know I will put schematic and PCB for this project and these days also I will put pictures of this project.