stray five volts

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dgajp

Member - Posts: 3

Joined: February 11, 2007

Location: Australia

Posted: January 11, 2014 at 6:39 AM / IP Logged

I designed this using relays I had on hand.to distinguish between negative and positive depending on probe input.except for unwanted 5 volts measured at probe , it works well.I could be better.

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dgajp

Member - Posts: 3

Joined: February 11, 2007

Location: Australia

Posted: January 11, 2014 at 5:30 PM / IP Logged

More Information

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oldspark

Gold - Posts: 4,913

Joined: November 03, 2008

Location: Australia

Posted: January 12, 2014 at 5:30 AM / IP Logged

What are you trying to do?

There is nothing there to distinguish between +12V or -12V since there are no diodes and no 0V.

You need to use comparator circuitry.

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oldspark

Gold - Posts: 4,913

Joined: November 03, 2008

Location: Australia

Posted: January 12, 2014 at 3:35 PM / IP Logged

PS - when you say +12V & -12V, is that a 24V supply, or do you mean +12V & 0V?

Also what is it probing - ie, it's not a logic probe for digital circuits or for some other low power output?

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dgajp

Member - Posts: 3

Joined: February 11, 2007

Location: Australia

Posted: January 12, 2014 at 4:00 PM / IP Logged

+12v 0v .this is an experiment using relays.the tester is meant to distinguish positive wire from ground in a 12 volt circuit

David

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oldspark

Gold - Posts: 4,913

Joined: November 03, 2008

Location: Australia

Posted: January 12, 2014 at 9:48 PM / IP Logged

Choose the right 12V relays - ie, turns off with less than 6-7V, then relay #1 85 to GND; Relay #2 86 to +12V, join Rly1 86 to Rly2 85 to the probe.

Rly1 is energised if the probe is +12V; Rly2 energised if probe = 0V.

Mind you, probe-wise +12V may mean +8V to 12V etc, and 0V may mean 0V to +4V etc.

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howie (aka: harryharris)

Silver - Posts: 355

Joined: February 17, 2014

Location: Florida, United States

Posted: March 07, 2014 at 6:43 AM / IP Logged

If you need to test POS and NEG sources make something up with a red and green 12V+ LED and some diodes, thus no draw and no harm to ECU based components also will cost pennies compared to what you've shown above.

Test before boxing up.

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stray five volts

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