Model Locos
Loco Wiring: Auto Reversing Lights
Some models have separate forward and reverse lights that need to change automatically when reverse is selected. The 4 relay version of the HRB can be configured to do this by following the diagram below. Read More
Noise Suppression for Multiple Motors
One question that often comes up is how to best arrange the motor noise suppression components on locos that have multiple motors driven from a single controller and spread across two or more bogies. There Read More
Double Heading Pro & 4QD Series
A lot of customers are now seeking to double head [or MU] locos with different models of 4QD controller, and a common request is how to link a new Pro-160 / 360 to an older Read More
Sound System Suppliers
We often get asked about sound system suppliers, so here’s a list of all those that we know about. Brian Jones Dallee Electronics Mtroniks Phoenix Sound Sense Innovations Soundtraxx South West Digital Trax Controls These Read More
DNO and Sound Cards
When using DNO with a sound card you will need to give the sound card a signal that relates to the speed of the model. There are a number of ways to do this described Read More
Clubs with controller test boards
Here’s a list of all the clubs that have a controller test board… Ashmanhaugh Light Railway Belfast & County Down Miniature Railway Society Bromsgrove Model Engineers Budmouth College Camp Creek Railroad Cleveland Association of Model Read More
DCC / Airwire Interface
We’ve been asked by a number of customers if our controllers can be made to work with a DCC orĀ Airwire system. This little circuit ought to do the trick…. With pins 2 and 3 Read More
Double Heading Wiring Diagram [DNO]
This diagram shows how to connect two DNOs in different model locomotives together using the expansion port. You can download a PDF version here. For the slave cable we recommend using a bulgin Read More
Mtroniks and regen braking
One of our customers has brought to our attention an issue that can arise when using an Mtronics sound card with a controller that has regenerative braking [all 4QD controllers]. The model in this case Read More
Towing
Towing an electric vehicle with a permanent magnet motor can cause major problems. If any E.V. is to be towed, you must disconnect the motors or else jack the machine so that the drive wheels Read More
Phoenix Loco Wiring
4QD supplied the complete wiring for Phoenix locos and the wiring of the loco is shown here for the convenience of Phoenix customers. This equipment was supplied only through Phoenix and enquiries about the locos Read More
Loco Wiring: Hand Control & Horn Relay Board
4QD’s Reversing Bell throttle hand control and associated Horn Relay Board are designed to simplify miniature Loco wiring whilst maximising features available. The Reversing Bell throttle gives a dead man speed control and may be Read More
Double Heading Problems
Systems using the expansion connector to double head with a pair of controllers (Pro-150 or Pro-120 or DNO or VTX) almost always simply work when wired correctly. But there are occasional problems with installations: Wrong Read More
Double Heading Switch
We were asked for a system such that either loco could be at front and could be facing either way. This seems to make selection of reverse very complicated, but it is in fact quite Read More