I have developed a range of small microprocessor based (ATtiny44) speed contoller using the TB6612 dual motor driver chip for Antweight Robots. Because of the cost and complexity of approvals testing I am unable to sell these commercially. I am prepared to make them, at a reasonable cost, on a one off prototype basis for friends who are fellow antweight enthusiasts. Besides offering two drive channels these controllers provide a 5v regulated supply for the receiver and weapon servo.
Because servos can have very different power requirements I have done testing with the following servos.
Saturn62, SuperTec HP Naro, Futaba FD33M, SuperTec S136L, Spektrum S75, Hitec HS81, HoBao H-101, PARK HPX F.
Option A controllers work with all but the PARK HPX F servo but all other controllers will work with all the listed servos.
There is also a compatibility issue with the Corona receivers as they output the different channel signals simultaneously and not sequentially as with normal receivers.
The motor drive boards can drive two of the standard microgearbox motors using a 2 or 3 cell lipo battery or two of the HP or 12v microgearbox motors using a 2 cell lipo battery. See here for approved motor table

The option B boards are designed to work with the Spektrum 2.4 Ghz receivers and have sockets mounted on them so the receivers plug straight into the controller boards reducing the number of wires, size and weight.

Option B-61 for AR6100 Receiver.
This board has a 3 x 7 way socket that the AR6100 receiver plugs straight into. Because the AR6100 receiver has a large capacitor on board it has been possible to design the board to work with all the tested servo's including the Park HPX F with a single 1.5A regulator. The board is 24 x 32 mm and weighs 7.4 gms with leads or 29 x 35 mm and 8.5 gms with heat shrink case. The output to the weapon servo is brought out on a 4 way plug. The first 3 pins are the standard servo connections but the 4th is the battery +ve. This enables, by use of a 4 way header supplied with the board, the servo to be powered directly from the battery supply. Two other pins are brought out to enable the receiver to be bound a transmitter while plugged into the controller using a link also supplied. The servo plug can be optionally mounted on the reverse side of the board as shown in the 3rd picture. This allows the AR6000 receiver to be plugged in to the board.

Option B-63 for AR6300 Receiver.
This board has 3 x 3 way sockets that the AR6300 receiver plugs straight into. Because the AR6300 receiver has no large capacitor on board a second regulator has been added to supply the servo separately enabling the board to work with all the tested servo's including the Park HPX F. The board is 24 x 36.5 mm and weighs 7 gms or 29 x 40 mm and 8gms with heat srink case. The ouput to the weapon servo is brought out on a 4 way plug. The first 3 pins are the standard servo connections but the 4th is the battery +ve. This enables, by use of a 4 way header supplied with the board, the servo to be powered directly from the battery supply. The 3rd picture shows the standard servo socket and the supplied header with the servo pins inserted.

This board has a 3 x 7 way socket that the AR6100 receiver plugs straight into. Because the AR6100 receiver has a large capacitor on board it has been possible to design the board to work with all the tested servo's including the Park HPX F with a single 1.5A regulator. The board is 47 x 47 mm and weighs 17 gms with leads, motor mount brackets and screws and an all up weight with receiver and motor gearboxes of 37 gms . The idea is that this board forms the chassis of the robot and six further mounting holes are included to assist with mounting armour and weapons. The ouput to the weapon servo is brought out on a 4 way plug. The first 3 pins are the standard servo connections but the 4th is the battery +ve. This enables, by use of a 4 way header supplied with the board, the servo to be powered directly from the battery supply. Two other pins are brought out to enable the receiver to be bound to a transmitter while plugged into the controller using a link also supplied. The servo plug can be optionally mounted on the reverse side of the board allowing the AR6000 receiver to be plugged in to the board.

It soon became apparent that because the option A board with its flying leads was the only one able to be used with 40MHz radio there was a demand for a version that could work with the Park HPX F servo as this is by far the most popular flipper servo. To achieve this it was necessary to bring the weapon output from the receiver onto the controller board to enable a second separate regulator to be included for the servo output. The board is 25 x 33mm and weighs 8.4 gms. It works with all the tested servo's and has the 4 pin servo plug giving the option for full battery voltage to run the servo.

Because the Planet R6M receiver size and form didn't fit with the existing Options I decided on a different approach. By removing most of the receiver's connector and replacing the large electrolytic capicitor I was able to solder the modified receiver to a speed controller board and come up with a complete module that was smaller than the receiver on it's own. This module provides a basic two motor speed controller with mixing. It works with all the tested servo's and has the 4 pin servo plug giving the option for full battery voltage to run the servo. The module is 42 x 26 x 9 mm and weighs 10.2 gms.