Search found 178 matches
- Tue Sep 11, 2018 6:39 pm
- Forum: Operation
- Topic: User outputs a gnd with power off
- Replies: 9
- Views: 15701
Here's what I have found. There is a slight error when using a relay off any of the user outputs if that relay has a permanent feed as it will power up the MJLJ unit. This is due to the way the 12V line from Pin9 of the ULN2003A is connected to the input of the Voltage regulator IC. See attached dia...
- Tue Sep 11, 2018 5:29 pm
- Forum: Future Upgrades
- Topic: Aux input readout
- Replies: 2
- Views: 10770
- Sat Feb 17, 2018 5:11 pm
- Forum: Operation
- Topic: User outputs a gnd with power off
- Replies: 9
- Views: 15701
- Sat Feb 17, 2018 3:29 pm
- Forum: Operation
- Topic: User outputs a gnd with power off
- Replies: 9
- Views: 15701
I've been looking at the data sheet for the ULN2003. The internal freewheeling diodes will allow 12V through from the outputs to the 'safe 12V' line of the mjlj which I think is powering it up. My next trial will be to remove pin 9 from the circuit and add the freewheeling diode at the relay instead...
- Sat Feb 17, 2018 9:35 am
- Forum: Operation
- Topic: User outputs a gnd with power off
- Replies: 9
- Views: 15701
I'm running an experiment on my desk with my spare V3 unit. Currently I have only 2 wires to it connected to Gnd and User Out 1. User Out 1 is connected to pin 85 of a standard automotive relay. Pin 86 is connected to 12V as per the diagram listed above. The coil has a resistance of circa 75 ohms. T...
- Fri Feb 16, 2018 5:09 pm
- Forum: Operation
- Topic: User outputs a gnd with power off
- Replies: 9
- Views: 15701
It's wired exactly as the diagram in the installation pages with user out 1 connected to a relay coil with the other side of the relay coil to a permanent 12V https://wiki.autosportlabs.com/File:MJLJ_User_output_examples.png This puts 12V on user out 1 and powers up the unit even though there is no ...
- Fri Feb 16, 2018 3:06 pm
- Forum: Operation
- Topic: User outputs a gnd with power off
- Replies: 9
- Views: 15701
Having an absolute nightmare with this. With the ignition off and no power to the mjlj at all, the feed through the relay to user out 1 is switching the mjlj on. With a diode in circuit it stops this, but user out 1 will then not switch on the relay. How do I stop this happening? If I switch the 12V...
- Wed Feb 14, 2018 7:46 pm
- Forum: Operation
- Topic: User outputs a gnd with power off
- Replies: 9
- Views: 15701
I think I've sussed it... I've wired a relay as per the instruction in the installation guide so that user out 1 is controlling a relay that has 12V permanently to the other side if the coil. Unfortunately, this seems to feed UO1 with 12Volts and actually powers on the mjlj. Hopefully the addition o...
- Mon Feb 12, 2018 8:21 pm
- Forum: Operation
- Topic: User outputs a gnd with power off
- Replies: 9
- Views: 15701
User outputs a gnd with power off
Trying to control a cooling fan with user out 1 set to trigger from aux (go to ground) at 88 degrees. I've wired as per the diagram in the instructions but have noticed that when no power is there to the mjlj the outputs go to ground which switches my fan on permanently. Is this correct? Currently l...
- Mon Feb 12, 2018 4:40 pm
- Forum: Future Upgrades
- Topic: Aux input readout
- Replies: 2
- Views: 10770
Aux input readout
Could there be an option in the tuner software to display the aux readout as just the corrected figure in a digital gauge like the others rather than just the analogue 0-255? This would be useful for reading the temperature etc. 'at a glance' rather than looking at the centre of a cluttered gauge fo...
- Fri May 27, 2016 2:12 pm
- Forum: Q&A
- Topic: Megajolt APP to Android
- Replies: 1
- Views: 4983
I did, but I had to buy a Windows tablet that runs a full version of Windows so I could use the standard configurator program. I got the Linx10 then constructed a Bluetooth module to plug into to my 9 pin com port (V3). hardware mods required to the board though for power and comms avoiding the RS23...
- Tue Nov 25, 2014 6:31 pm
- Forum: Future Upgrades
- Topic: Megajolt Android tuning app
- Replies: 104
- Views: 2275406
- Mon Nov 24, 2014 6:34 pm
- Forum: Future Upgrades
- Topic: Megajolt Android tuning app
- Replies: 104
- Views: 2275406
- Mon Nov 24, 2014 5:30 pm
- Forum: Future Upgrades
- Topic: Megajolt Android tuning app
- Replies: 104
- Views: 2275406
Got this done sooner than expected... Hardware mods... +5V from Vref to pin 1 of the serial port. Pins 11 and 12 of the MAX232 to pins 7 and 8 of the serial port. This gets the TTL signals out very neatly, BUT it means that if you wish to connect via a cable, you MUST use a home made one that only c...
- Sun Nov 23, 2014 5:13 pm
- Forum: Future Upgrades
- Topic: Configurator software: port to other OS?
- Replies: 16
- Views: 51267