Upgrade an LM293D Motor Controller

The lm293d is only rated for around 600ma of continuous current. To increase that greatly, swap out the chip, and stack the chips to double the current handling. The sn75441one chip is rated at 1 amp, 2 amps peak. Stacking them gives 2 amps, 4 amps peak (though I wouldn't recommend 4 amps through it).

How to hotrod a lm293d motor controller

1 - replace the lm293d chips with SN754410NE chips, like these: https://www.digikey.com/product-detail/en/texas-instruments/SN754410NE/296-9911-5-ND/380180

2 - stack the SN75441ONE chips pin-for-pin, use thermal tape, and use a heat sink like this: http://www.mouser.com/ProductDetail/Aav ... Asd08P8HAQ

thermal tape: https://www.amazon.com/gp/product/B01M723CAN/ref=oh_aui_detailpage_o05_s00?ie=UTF8&psc=1

This should provide around 2 amps per motor, continuous, over triple the original current handling of the lm293d. Here's what it looks like on the MotoPi motor controller that stacks onto a Raspberry Pi Zero W:

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