heatsinks for charging modules

[asval]

What’s that black substance on top of the circuits? grease?

http://www.ebay.com/itm/3-35V-to-1-2-30V-DC-Converter-Circuit-Buck-Boost-Solar-Wind-Voltage-Regulator-/370884975783?pt=LH_DefaultDomain_0&hash=item565a779ca7

I’m looking for different ways to add heat sinks to those charging modules from ebay

[comfychair]

The black stuff is potting compound, it's like an epoxy. That particular version is meant for through-hole soldering to a PCB, hence the four pins sticking up (down) at the corners. If you want to add your own heatsink, or if you aren't planning to use it attached to a PCB, start with the bare version: http://www.ebay.com/itm/370884960806 or pick one of the 800 similar but slightly different boards that do the same thing (search that seller's store for 'converter').

[asval]

@comfychair

The black stuff is potting compound, it’s like an epoxy. That particular version is meant for through-hole soldering to a PCB, hence the four pins sticking up (down) at the corners. If you want to add your own heatsink, or if you aren’t planning to use it attached to a PCB, start with the bare version: http://www.ebay.com/itm/370884960806 or pick one of the 800 similar but slightly different boards that do the same thing (search that seller’s store for ‘converter’).

Thanks and I wish I could’ve picked one up that already had everything in it. It’s for this board though

http://www.ebay.com/itm/LM2596-LM2577-Automatic-buck-boost-With-charging-Constant-current-Voltage-/150997811347?pt=LH_DefaultDomain_0&hash=item23282bc093

I’m mostly looking to attach a heatsink to the backside of the board. Also seen these heatsinks which look like just the thing, though I doubt that the thermal pads are any good.