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Hi All
According to my HEQ5Pro handbook the SynScan should be powered by 11-15v DC power supply (TIP POSITIVE) minimun of 2 amps. Hence, operating from a a fully charged car battery is OK. The inclusion of a BLOCKING DIODE is very wise in case you connect the battery around the wrong way. Also the plug on the power lead (intended apparently to be plugged into a car "cigarette" lighter outlet - tip positive) has a small led which glows red when the polarity is correct, if the polarity is reversed the led does not light. So CHECK THIS FIRST before you plug the other end of the lead into the mount.
I operate my mount from a JayCar switchmode regulated power supply which supplies 12volts at 5amp max (Cat No: GH1379 cost $29-95). This works well and gives me plenty of extra power to operate other accessories. I bought a cigarette lighter in line socket from JayCar and connected it to the power supply so that the supplied HEQ5Pro lead will plug straight into it. Again MAKE VERY SURE that you have got the polarity correct before connecting to the mount.
Also, never be tempted to operate your mount from an UNREGULATED power supply such as a mains powered car battery charger as the peak voltage from these would certainly exceed the maximum voltage limit of the HEQ5Pro. I do not know whether the mount has an internal regulator but I would not take the chance that it has. Besides an unregulated mains power supply voltage typically has no filtering capacitors and the DC output voltage consists of raw rectified alternating current of half sine wave pulses that will vary in voltage from zero to about 1.4 times the rated DC output voltage - murder for electronic equipment!
Cheers Peter
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