Here's a really cheap 43amp ESC option I've been testing.  It's a $9 Vex 
ESC driving a $10 43A h-bridge stage.  The Vex controller provides a no 
frills 100% forward and reverse PWM signal and the h-bridge module provides 
the 24V/43A capacity with high current shutdown.  Cool huh?

Steve Tyng


<https://lh3.googleusercontent.com/-Ykw0omv9XVw/VVzjOqbNcpI/AAAAAAAAAfM/W6bew_Phbtk/s1600/CheapESC.jpg>



On Wednesday, May 20, 2015 at 10:05:12 AM UTC-4, [email protected] 
wrote:
>
> Would it be possible to control a SSR via a low power, relatively cheap, 
> reversible ESC connected using a Y-harness to a servo operated micro-switch 
> to control direction?
>
> The primary motors speed would be controlled by the SSC proportionate to 
> the output of the low output Speed controller whilst their direction would 
> be switched mechanically by the micro-switch. It would be a sort of MAG 
> speed controller with proportional throttle via the SSR. I assume that the 
> secondary circuit (ie the Speed controller and SSR input) would probably 
> require a small load (a fan, perhaps?) to be included to prevent a direct 
> short of the speed controller output.
>
> The reason I'm asking is because high power speed controllers are 
> expensive and, in my limited experience, of limited life whereas a MAG 
> speed controller is cheap and reliable but crude. If the system I'm 
> suggesting here is viable it could make a reasonably cheap system possible 
> with the added advantage that if your ESC goes belly up during a battle 
> then you just take the SSR out of the circuit and you're back to a basic 
> MAG speed controller.
>

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