Re: [TANKS] MAG motor help please

[Frank Pittelli]

Here's a circuit that spins both Motors 1 & 2 in one direction when 
Switch A is pressed and spins only Motor 2 in the same direction when 
Switch B is pressed.  It uses a diode to prevent both motors from 
spinning when Switch B is pressed. (I don't think that such a control 
circuit is possible without a diode, but perhaps someone knows a trick.) 
The diode rating must be sufficient for the max motor load expected.  If 
the load will be more than a few amps, then the same circuit could be 
used to trip two relays to drive the motors, in which case the diode 
would be rated to cover only the relay coil load.

BTW: A "MAG Controller" is a mechanical H-bridge that provides by 
forward and reverse from a pair of switches. (First developed over 25 
years ago in the R/C warship hobby.) Since you only want a single 
direction with unusual control logic, the circuit should be named 
something different ... perhaps a "Funky Controller" :-)

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