I believe you can, but not as far down as you may need to go for the cars to stay on at full throttle. The 4 car base will go into a brown out mode if the voltage goes much lower than the expected input. I don't know what that level it, though. If anyone knows, RichG or RikoRocket would.
WOW! 4 volts?!? Wow. I figured it would brown out before that. Is that dependent on the version of the base, or will any old/new 4 car base handle volts that low?
That's super good to know, actually. It makes a variable voltage PSU even more useful, even (and especially) for beginners.
We are talking 12Volts, (4 Volts down on the standard 16V) even on the C7030 you could get down to below 11V before the brownout would cut in... Actually I think I shorted out one of the diodes so that would be + 0.7V so actually only down 3.3V.
Thanks for all the replies. The idea was that we have two tracks, one using a c7042 (which we have done - see www.hy-speed.co.uk) and the other as a practice track for the kids using a spare 4 car pb. We wanted to take the power down so we didn't have the club cars flying into the walls! However, we've decided not to do this at the moment due to organisational issues.
Another option is leave the power supply alone and fit a stop to the controller so the trigger cannot be pressed all the way down.
That way the cars are slowed down but there are still plenty of volts to drive the electronics and the lane changers.
3F is the hexadecimal value that the computer chip inside the 4PB reads when the throttle is fully pulled. Except for a lot of the ealy ones it didnt get anywhere near. Adding a resistor in parallel to the main slider would reduce the max value (throttles go from zero trigger=zero ohms to max trigger=max ohms) so it would reduce top speed.
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