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Car power amplifier circuit using C5100 / A1908

By Electronics Hobbyist 4 comments
Car amplifier is not very common as a project, because it is usually difficult to build, and expensive. A small error during assembly will result in power amps are not functioning properly. I suggest that you use the PCB for this amplifier. Even so, this circuit is simple to build, compact, relatively inexpensive, and provide a level of performance that will satisfy most of the needs of your car audio.

Car power amplifier circuit using Output Transistor C5100 / A1908. Power Output About 400W RMS at 8 Ohm. Power Supply need 32V DC Asymmetric, For car application you can adding inverter 12VDC symmetic to 32VDC asymmetric.

Car power amplifier circuit using C5100 / A1908
Part List :
Resistor's
R1,R3,R5,R6,R7,R9____1K Ohm 1/2 W
R20,R23_____________10 Ohm 1W
R8,R12______________22KOhm 1/2W
R10,R11_____________3k3 Ohm 1/2W
R13,R14_____________220 Ohm 1W
R16,R17_____________3,3 Ohm 1W
R18,R19_____________0,33 Ohm 5W
Capacitor's
C1__________________1uF / 50V
C2__________________220pF
C3,C6________________100pF
C4,C5,C12,C13________100uF/50V
C7,C8,C9_____________100nF
Transistor's
Q1,Q2,Q3_____________ C828
Q4___________________ MJE350
Q5___________________ 2SC3421
Q6___________________ 2SA1358
Q7___________________ C5100
Q8___________________ A1908
Note :There is NO SHORT CIRCUIT PROTECTION on amplifier circuit. The amp is designed to be used within a subwoofer or other speaker enclosure, so this power amp is matched for car subwoofer amplifier. A short circuit on the output signal will destroy the amplifier.The power dissipated is such that great care is needed with transistor mounting and cooler.

4 comments for "Car power amplifier circuit using C5100 / A1908"

  1. luisoquendoWednesday, February 21, 2018

    I have problems with a DJ Tech visa 160 I need the diagram to correct a voltage problem in the audio outputs. Will there be someone who has it?

    ReplyDelete
  2. NickMonday, April 16, 2018

    To get 400W RMS into 8 ohm needs about 56V RMS. With 32V supplies output is 22V RMS at best which will give just 60W.

    ReplyDelete
  3. tonyFriday, February 21, 2020

    As Nick says.
    To achieve 400W into 8 ohms the supply rails need to be at least +- 80V.
    I doubt those devices with 1 per rail would last very long before the smoke escapes.
    Those devices only have a rating of 120V. Would need devices with 200V minimum.

    ReplyDelete
  4. AnonymousMonday, October 30, 2023

    what is Q9-Q12

    ReplyDelete

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