coozer
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 posted on 24/2/09 at 09:59 AM |
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MegaJolt User Configurable Outputs Voltage?
On the 4 user configurable outputs present on the megajolt can anyone tell me what the voltage is please?
I'm currently wiring in the solenoid to activate the VVT.
Is there enough voltage to use one of these to switch a relay to activate my VVT?
Steve
1972 V8 Jago
1980 Z750
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coozer
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| posted on 24/2/09 at 11:06 AM |
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and poking about the MJ site have come across this... does it mean the output is an earth switch even though they say it outputs 500ma...
 
Rescued attachment MJLJ_User_output_examples.png
1972 V8 Jago
1980 Z750
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02GF74
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| posted on 24/2/09 at 11:24 AM |
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no.
the lines are called "outputs" but they sink current, not source it.
Look out how the LED and the relay coils are wired.
one end goes to power supply and other to the "output".
When you want your output to turn someting on, the output acts as a closed switch to 0 V; the current flows from the 12 V (as shown or any other
voltage within reason), via the resitor/LED or relay coil.
When off, the output acts as an open circuit hence no current flows.
The maxumum current switched is 500 mA.
If you want to wire solenoid, one end would be connected to power supply, 12 V presumably and other end to the "output". You should
include a snubber diode across the coil, unless this is already on the MJ board (I seem to recall seeing them).
[Edited on 24/2/09 by 02GF74]
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coozer
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| posted on 24/2/09 at 11:33 AM |
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Hmm, understand your principle there but is it safe just to connect a relay.. or am I risking damaging the unit?
What's a snubber diode??
1972 V8 Jago
1980 Z750
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02GF74
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| posted on 24/2/09 at 12:02 PM |
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quote:
Originally posted by coozer
Hmm, understand your principle there but is it safe just to connect a relay.. or am I risking damaging the unit?
What's a snubber diode??
what current does your relay requireto run on? if that is more than 500 mA, bad things may happen.
snubber diode = flyback diode
see http://www.locostbuilders.co.uk/viewthread.php?tid=100239
you need to check if your board has this diode, if not, then connect one across the relay coil.
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paulf
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| posted on 24/2/09 at 01:42 PM |
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Just conect the 12v supply to one side of the relay and the other side of the relay to the megajolt output.The megajolt earths the relay when on thus
operating it , the output is through an IC which incorperates the diodes if I remember correctly.
Paul.
quote:
Originally posted by coozer
On the 4 user configurable outputs present on the megajolt can anyone tell me what the voltage is please?
I'm currently wiring in the solenoid to activate the VVT.
Is there enough voltage to use one of these to switch a relay to activate my VVT?
Steve
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