I have used the following Servo Control Boards. All have their strengths and weaknesses: I believe there are other offerings but I haven’t used them as yet. These are just my own personal opinions as a user.
GF Controls Dual Servo Controller:
easy to set up
Cons: You have to be careful how you mount the servo to operate the signal, whilst you can reverse pull and release, this affects both servos, which may not be what you want do.
Cannot alter the characteristics independently
Cannot alter speed separately
Cost about £30.00 plus P&P
Everything is configurable except for the amount of bounce
Operation by push button
Costs :about £65.00 plus P&P Controls up to 12 servos
Controls 4 servos , has bounce option, DCC only, easy to set up with DecoderPro
Perhaps difficult to get hold of these days. Pre-
Single servo controller, bounce models available -
MERG (Membership required)
Cost of a Servo4 is less than £10.00
The cost of a Servo 1 to members is approx £4.00 and setting box less than £10.00 (You only ever need one of these)
Of course you have to build them!
Which do I personally prefer? Servo4 but am tinkering with Servo 1 at the moment. I can offer the MERG solutions to members at cost. In the case of servo4 with firmware for bounce.