Relay Fix for DC Extruder Motor Thing-O-Matic
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Published on March 3, 2011
Derived from
ToM Extruder Relay Fix
by MakeALot
Description
Different wiring of the relays removes risk of shorting the power supply, so no need for diodes to motor, but I added a resistance of 8 Ohms as additional security (in case the motor decides to short internally, probably not necessary).
Also, there are no capacitors, because they might influence reaction speed of relays.
I did the schematics with "fritzing", somehow they don't look as fancy and understandable as other schematics seen around here. What software do you use to draw schematics (on a mac) ?
This absolutely solved the erratic bahaviour of the DC Extruder Motor, who is now ready to print correctly the parts for a stepper extruder. :-)
Also, there are no capacitors, because they might influence reaction speed of relays.
I did the schematics with "fritzing", somehow they don't look as fancy and understandable as other schematics seen around here. What software do you use to draw schematics (on a mac) ?
This absolutely solved the erratic bahaviour of the DC Extruder Motor, who is now ready to print correctly the parts for a stepper extruder. :-)
Instructions
Oh and yes, if you build this and the motor spins backward instead of forward, just invert the cables which go to the motor. :-)
License
Relay Fix for DC Extruder Motor Thing-O-Matic by CloudMaker is licensed under the Public Domain license.
More from CloudMaker
Question: Did you do this newer circuit because of performance issues with the old circuit, or just to create a more efficient circuit with less parts?
I was just about to build the original (parts in hand, stripboard laid out, etc). Is this newer circuit preferable even if I already have the parts laid out? Did you experience a lag with the caps, or is that just theory at this point?
Thanks
Well, I had build my circuit before finding out that others had done similar circuits, so I flagged it as derivative, which eases finding solutions.
I prefer my circuit layout, because it avoids the possibility of shorting the power source by circuit layout rather than use of diods.
I've been running it for a few days flawlessly now without the resistor, I think the resistor can be omitted too.
Caps lag is just theory, it probably won't harm
if you put em in.
Anyhow, if you're almost done with your layout, #5569 will work as well as this one.
(and by "older circuit" I mean thing:5569)