DIYEFI.org Forum

I had a chat with Fred about PWM, and an interesting discovery was made concerning PWM pin assignments. Right now, there are two drivers connected to ports PP0.1 and two signal outputs at PP6.7, while ports 2 through 5 are for stepper controller. The request is to rearrange PWM output to pins 0 thro...

Strange the BOM didn't mention actual data on L1, it's not just "inductor", it's Wurth Elektronik 742 792 112 Ferrite bead,64nH, 3Apk. The extremely nice curve WAS partly a bad user error though, at 1k load the circuit is practically at idle. With 3 ohm load (1,7A) the ripple/jitter goes t...

Downloaded. I'll put it through the works tomorrow.

Damn impressive looking case! Compact and all business. When headers have internal fastening screws you just know it's going to be good.

Here's the circuit: http://koti.mbnet.fi/~vendigo/stuff/Circuit.jpg And the exported BOM. There's a lot of no good BS like having a 2N2222 transistor in the LDO part, the only components that did matter were the RT pin resistor, VC RC circuit, and obviously everything connected to the SW pin. The 1k...

It was probably some sort of oscillation, or software error. Input is 13.5 volts with plenty of noise. However, if the next graph is a valid result and not a software malfunction or Bad User Error, it's the jackpot.

well that's odd and borderline embarrassing, those both graphs are screwed up pretty bad. What I have now is a pretty funky looking modified 200µV sine wave at 1,8MHz modulated to a stable 2.4mV triangle wave at 7.5kHz that resists all filtering efforts. I guess learning the software better is the k...

Great job!

The only thing I care about in the 3D module is to be able to reasonably import them into a CAD program for case/installation design. To have an arbitrary unit non-engineering format is simply absurd.

Yeah Kicad developer crowd seems to be picking up pace. I wonder if the WRL export is in one of those overnight Linux builds?

This was after putting an ample slab of ferrite on the board... at least it's not sawtooth. That was a typical stabilized condition, the maximum voltage peak-to-peak is still 1mV, but the RMS voltage much less.