[quote name='Byo' timestamp='1501111657' post='3342648'] 
Radial StageBug SB-2, super small passive DI that is affordable and will do what you need. I have one and it has saved my bandmates a few times now in live situations when we needed and extra DI for keys, synth or an acoustic guitar. 
 
The SB-1 is the active one that needs phantom power to operate and is a good alternative if you are using a passive bass only, without any pedals or a preamp. 
[/quote] 
 
This. I also have the SB-2 and it's great. Passive, sounds great, built well. I don't think I'll ever sell mine!