Accessory Diagrams

Catching diode

If you have horns or relays fitted to your vehicle, you should fit a catching diode across each to prevent a damaging voltage spike, why? read on for the full story…. Coils, inductance and current Read More

DMR-203 Radio Control of a Porter 5 / 10

The DMR-203 can be used to give radio control of a Porter 5 / 10 at up to 24v by using the wiring shown below. The rest of the wiring should be as shown in Read More

Wiring for Hand Control and Radio Control

We are sometimes asked “Can a switch be fitted to swap between standard hand control and radio control?” This page explains how. The page details the DNO / VTX and Pro-120 but the same system 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

Foot Pedal

4QD’s Bell throttle assembly is a finger-tip operated ‘position sensor’ which is also very suitable for use as a position sensor for a foot pedal operated throttle. The diagram shows how it might be done. Read More