Cheap Drive ESC

[Rapidrory]

Ah excellent, real chips! :P (International Rectifier and Texas Instruments instead of chinese brands). Both chips are rated to 30V, but the MOSFETS gate to source voltage is +/- 16v, which is where the 16V voltage rating probably comes from. If I just stick a 15V regulator on the logic circuits it should be fine at 24V I'll have to get on and purchase some; there's quite a good selection to choose from here: http://www.aliexpress.com/wholesale?...20140814095633

As I expected the 340A rating is made up from the MOSFET's peak value of 470A; the MOSFETS are only actually rated at 140A continuous, and looking at the photos it appears that the current goes through a single MOSFET on the high side, and two MOSFETS on the low side. Even the two low MOSFETs are only gonna be able to handle 280A, and even that's only a theoretical value. For comparison, the TZ85 speed controllers uses two 130A continuous MOSFETSs in parallel, and yet is given a realistic output current of 85A. Going on that theory, it gives our cheap '340A' amp ESC an actual current rating of more like 40A... still, not bad for less then £10!

It'll probably have some firmware issues, but the LM339 suggests that they're using the same type of circuit as the 20A one's I've used in Richie, which is a pretty workable design. It should just be a case of adding the 15V reg and maybe upgrading the firmware. The cables and smoothing look perfectly adequate for my motors (which only draw 5A! I'm hoping to upgrade at some point though..)

Cheers for the all the info