EEVblog Electronics Community Forum
Electronics => Projects, Designs, and Technical Stuff => Topic started by: technix on May 14, 2015, 09:11:18 pm
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Constant current sinks, everyone should have one. So I rolled this puppy, a good mix of thru-hole and SMT based on what I currently have.
This constant current sink used 0R1 30W sense resistor array so the sampling section requires a RRIO preamp! It is a good news that the SO-8 RRIO dual op amp chip happen to have two viable options, LMV358 and TLC2272, both I own a stock of.
The power transistor is IRL540N for its lower Vgs(th) and this entire thing runs on USB bus power.
The digital section is full compatible with Arduino software (although used the 10-pin ICSP header and CH340G USB to UART bridge)
All controls are digital and it is computer controllable using the USB-Serial chip. The adjustments is fed into the analog section using MCP41010 digital pot.
Maximum ratings: 100V, 12.5A, limited by heat dissipation.
Trying to lay out a board without screwing anything over...