Tuesday, July 23, 2024
HomeVolkswagenMKIV Monsoon Amplifier Technical Dialogue and Modifications | VW Vortex

MKIV Monsoon Amplifier Technical Dialogue and Modifications | VW Vortex


I have been having a little bit of enjoyable reverse engineering the manufacturing facility Monsoon amplifier. I am simply going to drop this right here in case anybody’s bored. If in case you have any requests or extra info you would like so as to add, be happy to depart a reply. I will replace this submit as I compile new info.

After Market Head Items, Handbook Amp Distant Flip On Wire, and Parasitic Draw
The manufacturing facility Monsoon head unit applies a DC voltage to the constructive entrance left output to modify on the amplifier. When the automobile is turned off, the entrance left output is grounded to close off the amplifier.

Aftermarket head models clearly do not provide this DC sign. Speaker degree voltage is sufficient to drive the transistor which activates the amp, however since most inexpensive head models do not floor the output throughout standby the amplifier will more than likely keep on after the automobile is shut off. This can lead to a parasitic draw whereas the automobile is off.

A fast answer is to run the entrance left audio channel by way of a relay on the headunit. See submit #20 for Tiros’ answer. This may occasionally not work with line-level outputs.

The perfect answer for an aftermarket head unit, or to repair a manufacturing facility Monsoon amplifier with parasitic draw, is to wire up the Handbook Amp Flip On circuit. On the similar time, the Automated Amp Flip On circuit must be disconnected to keep away from injecting DC voltage on the speaker enter and frying your head unit.

Pin 12 on the Gray connector is for the turn-on wire. You will have to supply a restore pin to populate this connector, or hop on over to the components yard and yank one your self. You will need to run this wire all the best way as much as your head unit amp turn-on wire or faucet the accent wire. You would additionally reuse the CD changer harness when you do not need to run a wire. For those who do run a wire, you would possibly as properly run the RCA/Energy/and so on. for a subwoofer.

Along with the brand new turn-on wire, you will even have to maneuver the activate resistor from the Left Entrance speaker sign to the Pin 12 traces. Take the amp out of the automobile, unscrew the 4 screws on the underside of the amp, and pop off the underside and high covers. De-solder the turn-on resistor and transfer it to the situation indicated within the picture beneath. An excellent soldering iron, flux, and needle level tweezers extremely really useful.

Preview

Line Degree Enter
Opposite to in style perception, the Monsoon amplifier will settle for line degree enter. The enter is remoted on the first op-amp, which is setup as a voltage follower. Since this circuit is excessive impedance, any line degree enter can be utilized to drive it.

Simply be sure to wire up the Handbook Amp Activate talked about earlier, since line degree voltage is not sufficient to drive the transistor for the Automated Amp Flip On. It is also remoted from floor, so the amp additionally will not flip off after the automobile is shut off.

RCA connectors will be related on to the harness connector on the head unit. The instance beneath makes use of Mini-Match JR connectors in-between for cleanliness.

Preview

Crossover
Coming quickly.

Speaker compatibility
The amplifier ought to technically be 2 ohm steady on all channels for the reason that manufacturing facility rear woofers are 2 ohms. The remainder of the woofers/tweeters are 4 ohms.

The tweeters on low-line vehicles have a high-pass filter capacitor soldered on to the tweeter. This capacitor is lacking on Monsoon outfitted vehicles for the reason that amplifier already has a crossover constructed into it.

Monsoon Amp Pinout

Typesetting Font Rectangle Gas Engineering

24 Pin Gray Enter Connector (Left)

Pin​

Description Colour Notes

1​

Proper Rear Tweeter + Circuit Not Populated. Arms-free speaker?

2​

3​

4​

5​

6​

7​

8​

9​

10​

Mute Circuit Not Populated

11​

12​

Amp Flip On Not Linked

13​

14​

Left Rear + White

15​

Left Rear – Black

16​

17​

Proper Rear – Black

18​

Proper Rear + Brown

19​

20​

Left Entrance + Yellow Automated Amp Flip On

21​

Left Entrance – Black

12​

23​

Proper Entrance – Black

24​

Proper Entrance + Inexperienced

23 Pin Inexperienced Output/Energy Connector (Proper)

Pin​

Description Colour Notes

1​

Left Rear Woofer + Crimson/Inexperienced

2​

Left Rear Woofer – Brown/Inexperienced

3​

Proper Rear Woofer + Blue

4​

Proper Rear Woofer – Brown/Blue

5​

Left Rear Tweeter + Brown

6​

Left Rear Tweeter – Black

7​

Proper Rear Tweeter + Inexperienced

8​

Proper Rear Tweeter – Black

9​

Left Entrance Tweeter + White

10​

Proper Entrance Tweeter – Black

11​

Left Entrance Tweeter – Black

12​

Proper Entrance Tweeter + Yellow

13​

Left Entrance Woofer – Brown/White

14​

Left Entrance Woofer + Blue/White

15​

Proper Entrance Woofer – Brown/Crimson

16​

Proper Entrance Woofer + Crimson

17​

18​

Fixed 12 Volts Crimson

19​

Chassis Floor Brown

20​

Chassis Floor Brown

21​

Fixed 12 Volts Crimson

22​

Chassis Floor Brown

23​

Fixed 12 Volts Crimson

Delco 82452 Audio Amplifier
I have never been capable of finding any datasheets on-line for this chip. I’ll de-solder one and characterize it, however I have never the necessity to but.
TDA7396 must be a pin-compatible drop in alternative for the Delco 82452 (Coincidence?)

The diagnostics pin is setup to cut back the sign on the op-amp earlier than it is fed into itself. This contains short-circuit safety, thermal overload, and so on.

Pin​

Description Notes

1​

IN-

2​

IN+

3​

Vs+ 12v

4​

? CD-DIA Clipping Detect – Diagnostics. Low throughout error

5​

OUT-

6​

GND

7​

OUT+

8​

STANDBY Standby when Low

9​

Vs+ 12v

10​

SYNC Linked to all amplifier chips

11​

MUTE Muted when excessive (5v)

Amplifier chip areas

Passive circuit component Circuit component Green Hardware programmer Microcontroller

Volkswagen Half Numbers
I’ve no clue why the Jetta and Golf have totally different amp half numbers. Maybe they’re tuned in a different way?

Half Quantity Description
1J6 035 456 C Golf 2 & 4 Doorways Monsoon Amp
1J5 035 456 A Jetta Monsoon Amp

Entrance woofers are held in by rivets.

Half Quantity Description
1C0 035 411 E 2 Ohm 50W 140mm Monsoon Woofer Rear
1C0 035 411 G 4 Ohm 70W 140mm Monsoon Woofer Entrance
3B0 035 411 E 4 Ohm 19mm Monsoon Tweeter Rear (Todo: Verify Half Quantity)
3B0 035 411 F 4 Ohm 19mm Monsoon Tweeter Entrance (Todo: Verify Half Quantity)

Schematics
Coming quickly.

Fascinating Stuff

  • Unpopulated circuit for separate entrance/rear mute.
  • Unpopulated circuit for Handbook Mute on pin 10 of gray connector
  • Unpopulated circuit resulting in Proper Rear Tweeter on pin 1 of gray connector. Maybe for lowering echo for hands-free calling or navigation unit.
  • Disconnected circuit for Handbook Amp Flip On (see earlier part).

Floor Mount Marking Decoding
Transient checklist of floor mount PCB elements.

Marking Description
BA14741F Low Noise 4 Channel Operational Amplifier
MAW/RBR SST6838 NPN Transistor
MAZ/RFQ SST6839 PNP Transistor
R23 2SC3356 NPN Transistor
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