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Flashing Idicators question.
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Ray White



Joined: 02 Dec 2014
Posts: 6316
Location: Derby
PostPosted: Tue Mar 05, 2024 9:20 pm    Post subject: Flashing Idicators question. Reply with quote
As usual, I am probably over thinking this.

My indicator switch has a built in flasher unit. What I don't feel confident about is how it would cope with a relay.

By "cope" I mean if the relay operates the switch with a reduced voltage, would it be enough to operate the flasher unit?

When it comes to a switch, I don't really know if power is 'drawn' or 'pushed' through it.???
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ukdave2002



Joined: 23 Nov 2007
Posts: 4105
Location: South Cheshire
PostPosted: Wed Mar 06, 2024 8:29 am    Post subject: Reply with quote
A mechanical switch or relay contact (in good condition) will have negligible voltage drop .

What I'm not clear about is where the "relay" comes in to it, do you have relays after or before the flasher unit?

If its an electronic switch, there would be around a 0.7v volt drop due to the semiconductor forward bias.

Dave
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Ray White



Joined: 02 Dec 2014
Posts: 6316
Location: Derby
PostPosted: Wed Mar 06, 2024 10:13 am    Post subject: Reply with quote
ukdave2002 wrote:
A mechanical switch or relay contact (in good condition) will have negligible voltage drop .

What I'm not clear about is where the "relay" comes in to it, do you have relays after or before the flasher unit?

If its an electronic switch, there would be around a 0.7v volt drop due to the semiconductor forward bias.

Dave


I may have been unclear. The relay question was a hypothetical one. I don't have a relay for the indicators; I just thought for a moment that I might add one while I am wiring them up... but I probably won't need it as both the switch and wiring is new.

So,,the voltage from a relay to a switch is still 12 volts even though there is less current?
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ukdave2002



Joined: 23 Nov 2007
Posts: 4105
Location: South Cheshire
PostPosted: Wed Mar 06, 2024 11:01 am    Post subject: Reply with quote
Ray White wrote:
ukdave2002 wrote:
A mechanical switch or relay contact (in good condition) will have negligible voltage drop .

What I'm not clear about is where the "relay" comes in to it, do you have relays after or before the flasher unit?

If its an electronic switch, there would be around a 0.7v volt drop due to the semiconductor forward bias.

Dave



So,,the voltage from a relay to a switch is still 12 volts even though there is less current?
The question doesn't make sense Confused a relay is simply an electrically operated switch, the "output" voltage from a "made" relay "contact" will dependent on what voltage is on the other side of the contact, a 12v relay may be switching 240v mains?
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