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Anything related to printer controllers not being Duet, RAMPS or Sanguinololu: microprocessors, motor and heater driver circuitry, gEDA/KiCAD issues, soldering tips, etc.
Re: Beware naked MOSFETs - 11 years ago
This is what I'm going to use to fix mine. Mouser: Mfr. #: 0257010.PXPV Desc.: Fuses 32V 10A $0.56 (automotive fuse) Mfr. #: 0257005.PXPV Desc.: Fuses 32V 5A $0.53 (automotive fuse) Mfr. #: 01550400Z Desc.: Fuseholders, Clips, & Hardware Inline $1.72 (for automotive fuse) Mfr. #: BSP030,115 Desc.: MOSFET Power TAPE-7 MOSFET $0.61 (SOT-223 pkg) Mfr. #:by Nivek - Controllers
Re: Beware naked MOSFETs - 11 years ago
The diode surly won't protect against a short circuit. I'm just saying that a this diode is a good practice I wish I had kept to since one of mine is blown. Did anyone find a good alternative? I'm looking at BSP030 at mouser but it does not have protection circuitry. OK BUK9840-55 has ESD protection but no over current. -Hey the "on" resistance of mosfets means some devices can handle higher cby Nivek - Controllers
Re: Beware naked MOSFETs - 11 years ago
It's a good idea to place a diode, in reverse bias, in parallel with inductive loads like relays and coils. The extruder heater most defiantly forms an inductive load. The extruder heater probably has a mighty inductive kick when the mosfet turns off. This could easily destroy a mosfet transistor. The diode conducts when the power is removed. This keeps inductive current confined to the inductorby Nivek - Controllers
Re: thermistor temperature - 11 years ago
Ok the reprap host software reads the temperature, but not regularly. The temperature value only updates when the "Switch heat on button is pressed. It doesn't update after that unless this button is pushed again. Apparently the Ramp button is ineffective. I guess these are all host software bugs. thanksby Nivek - EMC2
Re: thermistor temperature - 11 years ago
Update having added Serial.start(19200); to the setup() function of the extruder boards program Extruder.pde in the arduino environment. I added to extruder_class extruder::internalTemperature right before return(celsius) : Serial.println(celcius); This reads the temperature so I will trace it ferther...by Nivek - EMC2
Re: thermistor temperature - 11 years ago
I've got the exact same problem. Did you ever solve it?by Nivek - EMC2