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.
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
- 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