Most modern toy cars with remote controls use a radio channel. This forces parents to purchase batteries for both the remote control and the toy itself. If the car uses wired control, the batteries are inserted only into the remote control, and they are consumed only while driving, but not in standby mode, as with radio control.
Instructions
Step 1
Take any spoiled radio-controlled car. The main thing is that the motors and gearboxes are in good working order. Take the rest out of it.
Step 2
Familiarize yourself with the mechanical part of the toy. If it has one engine, it means that it is equipped with a special mechanism that makes it move forward when the motor rotates in one direction, and when the other rotates sideways. If there are two motors, then one of them, depending on the direction of rotation, moves the model forward or backward, and the other, when a voltage of one polarity is applied to it, deflects the steering mechanism in the appropriate direction.
Step 3
If the remote control is also preserved from the toy, even if it has fallen into disrepair, use it as well. Use only the switches from it, and remove the transmitter. True, a set of batteries for powering the engines will not fit into it. Place it in a separate enclosure. If the remote is lost, reassemble it yourself. To do this, you will need to take a suitable case, as well as one or two switches (according to the number of motors), each of which has a stable middle position and two unstable extreme ones. number of switches, you can use it. In all cases, the switches must be such that, at the moments of switching, even short-term short-circuits of the extreme poles do not occur in them.
Step 4
Use four AA batteries to form a bipolar power supply with two cells in each arm. For low voltage motors, use two batteries, one in each arm.
Step 5
In a car with two motors in series with the one that controls the turn, turn on a flashlight bulb rated for the same voltage as one arm of the power source, and a current of about 250 mA. This light will limit the current through the locked engine at the extreme positions of the steering gear. It will also glow when cornering.
Step 6
In parallel to each of the motors, connect a capacitor with a capacity of about 0.1 μF to suppress interference.
Step 7
Take the flex cable. It must be two-wire for a single-motor model and three-wire for a twin-motor model. Its cross section should be, on the one hand, large enough so that significant stress does not fall on it, and on the other, small enough so as not to impede the movement of the model.
Step 8
For the single motor model, simply connect the cable to the motor. For two motor models, find the polarity so that one motor makes it move forward and the other makes it turn to the right. The outputs of the motors, which in this mode are connected to the negative pole, connect together, and then connect to one of the cable wires. Connect the remaining two wires to the remaining motor leads.
Step 9
If the machine is single motor, connect one of the wires in the cable to the midpoint of the power source and the other to the midpoint of the switch. Connect one of the poles of the power supply to one extreme contact of the switch, the other to the other. Now, in one of the positions of the switch, the machine will go forward, in the other - it will turn. If you want to swap the positions of the switches, swap the wires going to the outer contacts.
Step 10
If the machine is twin-motor, connect the common wire of the cable to the midpoint of the power source, and the rest to the midpoints of the switches corresponding to the motors. Connect the plus of the power supply to the extreme contacts of the switches corresponding to the forward movement and turn to the right, and the minus to the extreme contacts of the switches corresponding to the movement back and to the left.
Step 11
Get ready for the fact that the batteries in the arms of a bipolar power supply will wear out unevenly, and you will have to change them in one and the other arm independently of each other.
