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Category - Old Models

Inhibit

Date: 25th February 2016
By: 4QD
Categories: 4QD 200/300

1QD Speed Controller

Date: 25th February 2016
By: 4QD
Categories: 1QD

2QD Speed Controller

Date: 25th February 2016
By: 4QD
Categories: 2QD

Eagle Speed Controller

Date: 25th February 2016
By: 4QD
Categories: Eagle

Egret Speed Controller

Date: 25th February 2016
By: 4QD
Categories: Egret

UNI / Egret Wiring Options

Date: 25th February 2016
By: 4QD
Categories: Egret, Uni

NCC Zener Diode Failure

Date: 25th February 2016
By: 4QD
Categories: NCC

NCC Key Components

Date: 25th February 2016
By: 4QD
Categories: NCC

NCC Mark 1 Issue Number History

Date: 25th February 2016
By: 4QD
Categories: NCC

NCC Mark 2 Issue Number History

Date: 25th February 2016
By: 4QD
Categories: NCC

VTX / NCC Fault Finding

Date: 25th February 2016
By: 4QD
Categories: NCC, VTX

NCC Circuit Description

Date: 25th February 2016
By: 4QD
Categories: NCC

VTX and NCC Operating Voltages

Date: 25th February 2016
By: 4QD
Categories: NCC, VTX

NCC Speed Controller

Date: 25th February 2016
By: 4QD
Categories: NCC

PRO 120 Mark 1 – Additional Diagrams

Date: 25th February 2016
By: 4QD
Categories: Pro-120

Pro 120 Mark 1 Speed Controller

Date: 25th February 2016
By: 4QD
Categories: Pro-120

Scoota Speed Controller

Date: 25th February 2016
By: 4QD
Categories: Scoota

UNI Speed Controller

Date: 25th February 2016
By: 4QD
Categories: Uni

VTX Speed Controller

Date: 25th February 2016
By: 4QD
Categories: VTX

VTX Modification History

Date: 25th February 2016
By: 4QD
Categories: VTX

Easybike Wiring Notes

Date: 25th February 2016
By: 4QD
Categories: 1QD, 2QD

Uni: Alternative Voltage Usage

Date: 9th March 2016
By: 4QD
Categories: Uni

Battery Discharge Protection: PRO-120

Date: 10th March 2016
By: 4QD
Categories: Pro-120

4QD version history

Date: 18th March 2016
By: 4QD
Categories: 4QD 200/300

Mixing 4QD 150 / 200 / 300 series boards

Date: 18th March 2016
By: 4QD
Categories: 4QD 200/300

Damage from a Reversed Battery (4QD Series)

Date: 18th March 2016
By: 4QD
Categories: 4QD 200/300

Reversing Latch Modification [pre issue 16]

Date: 18th March 2016
By: 4QD
Categories: 4QD 200/300

Reverse Speed Modification [pre issue 17]

Date: 18th March 2016
By: 4QD
Categories: 4QD 200/300

Control Board Modification [Pre June 2010]

Date: 18th March 2016
By: 4QD
Categories: 4QD 200/300

Use with Tacho Feedback Board

Date: 18th March 2016
By: 4QD
Categories: 4QD 200/300

Current limit resistors

Date: 18th March 2016
By: 4QD
Categories: 4QD 200/300

Reverse Acceptance Threshold [RAT] Modification

Date: 18th March 2016
By: 4QD
Categories: 4QD 200/300

Testing the 4QD Base Board and MOSFETs

Date: 18th March 2016
By: 4QD
Categories: 4QD 200/300

Fault finding on the 4QD series

Date: 18th March 2016
By: 4QD
Categories: 4QD 200/300

How to dismantle the 4QD series

Date: 18th March 2016
By: 4QD
Categories: 4QD 200/300

Deadband values and removal

Date: 18th March 2016
By: 4QD
Categories: 4QD 200/300

Over voltage protection in the 4QD series

Date: 18th March 2016
By: 4QD
Categories: 4QD 200/300

Inhibit Ramp Modification [4QD series]

Date: 18th March 2016
By: 4QD
Categories: 4QD 200/300

Disabling HPLO on Early 4QD Models

Date: 18th March 2016
By: 4QD
Categories: 4QD 200/300

Converting Parking Brake to Brake Light

Date: 18th March 2016
By: 4QD
Categories: 4QD 200/300

Pro-120 Ignition Options

Date: 21st March 2016
By: 4QD
Categories: Pro-120

Pro-120 Robot Wars Version

Date: 21st March 2016
By: 4QD
Categories: Pro-120

Pro-120 Modification to give Uni-Directional Control

Date: 21st March 2016
By: 4QD
Categories: Pro-120

Fitting Expansion Connector

Date: 21st March 2016
By: 4QD
Categories: NCC, Pro-120, VTX

PRO-120 Ramp Reduction

Date: 21st March 2016
By: 4QD
Categories: Pro-120

PRO-120: Multiple Slaves

Date: 21st March 2016
By: 4QD
Categories: Pro-120

Pro-120 Fault Finding Tips

Date: 22nd March 2016
By: 4QD
Categories: Pro-120

Modifying the Pro-120 for other voltages

Date: 22nd March 2016
By: 4QD
Categories: Pro-120

Earth Fuses: Why Do They Blow?

Date: 22nd March 2016
By: 4QD
Categories: Pro-120

Pro-120 Key Components

Date: 22nd March 2016
By: 4QD
Categories: Pro-120

Pro-120 Mk2 History

Date: 22nd March 2016
By: 4QD
Categories: Pro-120

Pro-120 Mk1 History

Date: 22nd March 2016
By: 4QD
Categories: Pro-120

Current Limiting in the Pro-120 [and others]

Date: 22nd March 2016
By: 4QD
Categories: Pro-120

Uni: POT Track Fused

Date: 22nd March 2016
By: 4QD
Categories: Uni

UNI: Use with PWM Input

Date: 22nd March 2016
By: 4QD
Categories: Uni

Internal Power Supply and Protection Circuitry

Date: 22nd March 2016
By: 4QD
Categories: NCC, Pro-120, VTX

Forward / Off / Reverse Mode (4QD Series)

Date: 22nd March 2016
By: 4QD
Categories: 4QD 200/300

Ramp Timings (NCC)

Date: 22nd March 2016
By: 4QD
Categories: NCC

Waveforms and Fault Finding

Date: 22nd March 2016
By: 4QD
Categories: NCC, VTX

Damage from Reversed Batteries (NCC/VTX)

Date: 22nd March 2016
By: 4QD
Categories: NCC, VTX

Inhibit switch / footbrake – 4QD series only [tour 16]

Date: 23rd March 2016
By: 4QD
Categories: 4QD 200/300

Uni: Disabling Regen

Date: 10th May 2016
By: 4QD
Categories: Uni

Adjustment for 48V

Date: 30th August 2016
By: 4QD
Categories: 4QD 200/300

Battery Contactor for 4QD-200 / 300

Date: 27th April 2017
By: 4QD
Categories: 4QD 200/300

DMR-203: Use with 4QD Series Controllers

Date: 27th October 2017
By: 4QD
Categories: 4QD 200/300, DMR-203

Damage From Blown Mosfets

Date: 30th October 2017
By: 4QD
Categories: 4QD 200/300

Ampflow motor

Date: 5th April 2018
By: 4QD
Categories: 4QD 200/300

SST-031 Settings For Hall Throttle

Date: 14th February 2019
By: 4QD
Categories: SST

Control Board Jumper Positions

Date: 1st June 2019
By: 4QD
Categories: 4QD 200/300

4QD-200/300 Overview

Date: 5th September 2022
By: 4QD
Categories: 4QD 200/300

Double Heading for the Pro-150 and 4QD Series

Date: 4th November 2022
By: Steve Smith
Categories: 4QD 200/300, Double Heading [MU], PRO-150