Bachmann / Model Rail USATC S100 Tank sound fitting

 This is a very straight forward installation; 2 screws long one the front short one to the back hold the body in place. The Zimo MS500N sound chip and a Minnow4 15x8x4.5 speaker from https://www.youchoos.co.uk/ only have the speaker wires (purple) the remaining wires were removed. The Minnow4 slips in-between the gear tower and PCB riser, it is necessary to shorten the pins on the MS500 to 4 millimetres long pin 1 is to the right as you look down it is marked, and wrap the chip with 20 mm Kapton tape other than that it’s plug and play.

SECR P Class 0-6-0T 323 'Bluebell' sound fitting.

 My Hatton’s now Accurascale ‘Bluebell’ is now fitted with a Zimo MS500N sound chip and a Minnow 4speaker from https://www.youchoos.co.uk/. Except for the speaker wires (purple) the remaining wires were removed.

Remove 4 screws from the chassis to release the body there 2 at the front 2 at the rear. The speaker fits in the Left hand side of the chassis after removing the small weight I stuck a sliver of 1 mm plastic card to insulate the speaker from the cast chassis.

 

It was necessary to remove approximately 3 millimetres from the cast chassis where the chip would fit this was to enable sufficient clearance I also deepened the slot where the interface board sits pin 1 is to the top of the board. I machined mine in a milling machine and deepened the slot with a hacksaw; the casting is quite robust holding it in a vice gently was not an issue so carefully cut it away with a hacksaw is a possibility. 

Finally I lined newly milled area with 1 mm plastic card to insulate the chip from the chassis. It is necessary to shorten the pins on the MS500 to 4 millimetres long and wrap the chip with 20 mm Kapton tape. The Minnow4 15x8x4.5 is held in place on the plastic card with double sided tape.

Hornby Sentinel 0-6-0 sound fitting.

 Hornby Sentinel 0-6-0 sound fitting.

Another straight forward conversion first remove the 4 body fixing screws, the body just pulls away mine was a little tight. I trimmed the orange and white wires again sealing the end with a short length of heat shrink tube.

This time I chose the Zimo MS500N sound chip and a Microcube 12x8x7 speaker this fits nicely behind the motor held with double sided tape. Wrapping the chip with 20mm wide Kapton tape. Carefully position the wrapped chip on top of the motor again secured using Kapton tape, once again no major surgery to the model.

Bachmann GWR Class 56xx sound fitting

This is a quite straight forward exercise first remove the NEM pockets to reveal the body fixing screws, the body just pulls away.

I opted for firebox glow this time the backhead is glued to the chassis you need to gently prise the backhead away off the chassis mine broke off the locating pins (easy fix just drill out the broken part in the chassis and fit a new pin into the back head of course you will have to carefully drill a hole for it I used a 1.5 mm drill) make a hole in the firebox doors I suggest 2.5mm to allow the glow from the LED to show. Glue to cables to the back of the back head and cover the LED with blacktack and reattach to the chassis.

I chose the Zimo MS480R sound chip and a Sugarstrand 25x09x06 speaker. It is necessary to unsolder the green and blue wires from the 8 pin plug these are connected to the fire box glow LED with a 1K resistor in the blue wire. Due to the limited space cut back the stayalive wires sealing the end with a short length of heat shrink tube. Attach the speaker to the flat plate in front of the backhead with double sided tape. 

Plug in the chip and tidy the wires over the chip and secure with Kapton tape. A simple and elegant installation with no major surgery to the model except the 2.5 mm hole!