GQ-4X Programmer from MCUMALL.com Review!

[Six_Shooter]

Some EPROMs, due to the voltage needed might require an external power supply. If you burn out your USB port, don't go blaming the programmer. ;) The USB port is only 5V and 500 mA. Trying to bump that up to 21 V will draw a LOT of current from the USB port, The GQ-3X also has a power port, but is only needed for the EPROMS that require a higher voltage to program, as well.

[EagleMark]

I see some others having good luck and leaving feedback so figured I'd uipdate.

Some EPROMs, due to the voltage needed might require an external power supply. If you burn out your USB port, don't go blaming the programmer. ;) The USB port is only 5V and 500 mA. Trying to bump that up to 21 V will draw a LOT of current from the USB port, The GQ-3X also has a power port, but is only needed for the EPROMS that require a higher voltage to program, as well.

There is some truth to this. After using the Gq-4x for 2 years on one laptop I never had issues with burning chips without a External Power supply. Well that all changed when I changed laptops. Chip burn went fine and the lights all did the same thing but chip was no good? Took a while to figure out but broke out the old laptop and it worked fine! So I bought the wall wart power supply and it now works on all laptops I tested it on.