Mini-Z Lights

How to install front, rear, and under car lights in a Kyosho Mini-Z car.

This page demonstrates how to install front, rear and under car lights in a Kyosho Mini-Z car.

For this example I modified a Kyosho Mini-Z AWD, VW Golf R32. The modification includes two white front LED´s, two red rear LED´s, and two bars with 4 blue LED´s each and a simple electronic circuit to keep the lights on without flickering or changing brightness.

The circuit is active while driving forward or backward and braking. There is an additional short delay (actual 3s) after the motor stopped and before lights turn off automatically. Delay time can be changed by values of R2 and C2. See schematic for calculation.

A simple NE555 timer working as monoflop is used to drive the LED´s lights by a power MOSFET. The 555 creates the delay and keeps the lights on independent of motor speed and direction.

Electronic circuit (Click for better resolution)

Schematic

Schematic for delay circuit

LED circuit (Click for better resolution)

LED connection diagram

LED connection diagram

Components placement

Components placement

Components placement

Layout

Layout

Layout for delay circuit

Layout in PDF Format
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Details

Parts required

Name
Value
Package
C1 10nF 0805
C2 10uF 0805
C3 100nF 0805
D1 1N4148 0805
D2 1N4148 0805
D3 1N4148 0805
IC1 NE555 SMD SO8
IC2 SI4410BDY SMD SO8
R1 10K 0603
R2 270K 0603
R2 10K 0603

The diodes 1N4148 should be in 0805 package if available, Mini-MELF will work as well but mounting is a bit tricky then.

Click images to enlarge


Soldering wires on cars PCB

Soldering wires on cars PCB

Soldering GND

Soldering ground wire

Size of circuits PCB

Size of circuits PCB

Left body connection

Left body conenction

Right body connection

Right body connection

Rear LED´s

Rear LED´s

Front LED installation

Front LED installation

Right chassis connector

Right chassis connector

Left chassis connector

Left chassis connector

Complete PCB installation

Complete PCB installation

Front LED´s

Front LED´s

Right front LED

Right front LED

Front lights on

Front lights on

Front lights on

Front lights on

Rear lights

Rear lights

Rear lights on

Rear lights on

Overview

Overview

Under car light LED bars

Under car light LED bars

Under car light turned on

Under car light turned on

Side view

Side view

Side view in darkness

Side view in darkness

Close front view

Close front view

Close rear view

Side view

Overview

Overview

Tricks:

  • Do not cross polarity of the circuit, it will destroy the 555
  • Remove batteries from the car while working on the electronic!
  • Always use series resistors to limit the LED current, calculate like R=(Ubatt – Uled) / Iled
    I used 20Ohms for two parallel connected white LEDs, and 56Ohms for two in series connected red LED´s
    24Ohms for 4 blue LEDs in parallel on the under car light bars
  • After LED installation use some black paint to cover the LEDs from inside the body to reduce flare light under the car. See image Overview, it´s without paint

6 thoughts on “Mini-Z Lights

    • Lights are always on independent of motor speed and direction. There no such thing like a brake light.

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