Search found 7 matches

by roarin_mouse56
Tue Sep 19, 2017 6:04 pm
Forum: MegaShift Transmission Application
Topic: PWM3 circuit
Replies: 4
Views: 1578

Re: PWM3 circuit

Just a brief note: the Low side switch dissipates powe (in the form of heat) only during the "off" time while the resistor and flywheel diode dissipates during the "on" time.
by roarin_mouse56
Tue Sep 19, 2017 5:59 pm
Forum: MegaShift Transmission Application
Topic: PWM3 circuit
Replies: 4
Views: 1578

Re: PWM3 circuit

Use a device called a "low side switch" its packaged like a MOSFET (3 leads Gate, Source and Drain) but it has a built in flyback limiter that works closely like the low impedance injector drivers that are available on the MS2 & MS3. The difference is that it is integrated into one package. In my op...
by roarin_mouse56
Sun Aug 27, 2017 5:45 am
Forum: MegaShift Transmission Application
Topic: PWM3 circuit
Replies: 4
Views: 1578

Re: PWM3 circuit

If the output doesn't change state quickly (like a PWM output), there won't be much heat generated so a resistor isn't needed. I assume that because it's for a shift solenoid that it won't be changing state rapidly. There will be a fly back pulse whenever the solenoid is deactivated so you'll need a...
by roarin_mouse56
Sat Aug 26, 2017 7:52 am
Forum: MegaShift Transmission Application
Topic: The 4.7 ohm resistor
Replies: 2
Views: 1103

Re: The 4.7 ohm resistor

I did some SPICE modeling of the solenoid, the resistor a diode and a switch (BJT). With the flywheel diode, the current through the solenoid doesn't stop quickly enough to provide a linear average current across the range of duty cycles. That is, it's no longer PWM because the current rise time thr...
by roarin_mouse56
Sat Aug 26, 2017 5:15 am
Forum: MegaShift Transmission Application
Topic: CAN pass through
Replies: 3
Views: 1156

Re: CAN pass through

Are you running MS2Xtra?
by roarin_mouse56
Fri Aug 25, 2017 9:17 am
Forum: MegaShift Transmission Application
Topic: CAN pass through
Replies: 3
Views: 1156

CAN pass through

Does the CAN pass through work with MegaShift and MS2 Extra?
by roarin_mouse56
Wed Aug 23, 2017 9:52 am
Forum: MegaShift Transmission Application
Topic: The 4.7 ohm resistor
Replies: 2
Views: 1103

The 4.7 ohm resistor

I don't see why we need a 4.7 Ohm resistor in the PC circuit. The micro controller is sending PWM so why not decrease the duty cycle?