Yes a regulator goes "in line".

A regulator has;

Vin (Voltage In) Vout (Voltage Out) Ground (Some have 2 grounds, they connect to the same thing)

Vin connects to the EZ-B Vcc of any digital port Vout connects to the device which needs +5V Ground to ground

As for finding one in the UK... I've never looked for a 5V one. I have a 6V one in Melvin which is from an RC store online meant so you can use a LiPo with 6V RC Gear. Ebay and get from China is probably your best bet though.

Unless you fancy making one yourself on some protoboard? Farnell, RS, Maplin etc. all sell what you need (Don't use Maplin they are very over priced!) and the schematic is easy to find online...

Cheers Rich. No I won't try to make my own (just yet). Actually I just found and ordered one from a UK hobby shop. Should be with me at the end of the week.

It's a switchable 5v or 6v one with 5.5v to 23v input for use with 2-6S LiPo's as you mentioned. Thanks again for the confirmation.

I had one of those H bridges. You will want to buy heatsink for those transistors. You can get individual heatsink and a screw and nut to hold it on.... or you can buy 2 x 4" long x 1" thick heatsink and drill holes to accommodate connections to each transistor.

Thanks for the heads up Jstarne1.

I used a 5v regulator for the 5v logic.One of those small ones from China.Paid less than $4 us..on Ebay.my motor power is 12vdc sla battery.

I got something similar to what you did @rb550f and just installed it. It's all wired up now and everything is working but I have come across one thing I NEED eek to sort out. I have done an Init script for EZ-B start up setting both motors PWM to "0" just to be on the safe side, but every time I power up the EZ-B, the wheels spin like crazy and have to lift the chassis off the ground until a network connection is established and the init script runs. How do I stop this from happening before any damage is caused?

Thanks.

Put a switch on the motor controller's + power lead... Only turn it on once the ezb and software is up and running... Switch the motor controller on and then run the init script...

@Richard.

Hey dude. I actually have an isolator switch in place already for maintenance use, but this will kill the idea of powering up with the remote control fob I have. Is there no other way to stop this? stress