Below I will write about some essential components for your tank project whether it is a tank or a rover or other project that runs on brushed motors.
Electronic Speed Controllers ESC
These electronic parts control the motors back and forth via the remote control. They have a variable speed from a few revolutions per minute to several thousand revolutions depending on the voltage and the power of the motor.
I order most of the parts from ebay
1. 320a esc 7.2-16v
I personally used the controller from ebay 320a esc 7.2 – 16v, which is good enough if you don’t force it with high voltage and amperage. I also used them on 16 volts but I recommend using a small amperage. The TRA MI project uses these controllers for cordless drill motors and 360 degree turret.
2. 7.2v esc
The other t34 r tank project uses two 7.2 volt esc controllers also from ebay that do their job. They are among the cheapest. I also used these two controllers for RC cars, not just tanks .
Depending on the funds, you can opt for sabertooth speed controllers, which are made especially for tanks.
4. Cordless Drill Esc
you can also use the cordless drill button as a speed controller, which varies from 12 to 24 volts and 10-20 amps. You can find these cordless drills quite cheaply at flea markets.
5. 40A Bidirectional Brushed
in the future I would like to order and try two 24 volt and 40 amp speed controllers for one of my projects. They are reasonably priced and I think they are worth a try. you can find these esc on dfrobot.com
6. Servomotor ESC 6v
You can also make a mini esc from a small servomotor, disassemble the housing, desoldering off the wires from the small motor and solder wires on another larger motor, unscrew the upper housing and remove the gears, and place the final shaft in position 0 until the engine stops. After this operation the motor becomes controllable back and forth from the remote control.