12 volt DC lamp flasher.

mrmodify

Feb 13, 2010
157
I am looking to build a motorcycle dash indicator lamp flasher. It will be used to indicate a no oil pressure warning light.
The motorcycle already has a warning lamp in the speedo for a low oil level. The low oil level lamp illuminates when the float in the oil sump grounds. I tied into the low oil level lamp and am using a pressure switch which grounds when there is no oil pressure.
The circuit will have to be in series between the lamp and the ground. The lamp draws less than 10ma.
I have searched the internet with no luck. A normal blinker flasher will not work because of the low amperage the lamp will draw.
I appreciate any input to this project.
Thanks MrModify

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,505
This may do the trick.

hevans1944

Hop - AC8NS
Jun 21, 2012
4,726
Lots of neat ideas on that page. Thanks @(*steve*) !

AnalogKid

Jun 10, 2015
2,661
This may do the trick.

The very first solid state circuit I messed with was a code practice oscillator based on this two-transistor classic, a looooong time ago.

Great link, love the Marx generator.

ak

mrmodify

Feb 13, 2010
157
Thanks (*steve*) assembled on my bread board and played with changing a few componets. Going to fit the bil! Going to build it on a pc board and then seal the board some kind of way.

Thanks again all!!!

mrmodify

Feb 13, 2010
157
Evening all, I spoke wrong on the 10ma. The bulb in the bike is actually a 117ma bulb. (1.4w @12v)
I have the circuit working on a 10 ma bulb but the 117ma bulb won't light.
I am assuming I will need larger componets. 1/2w resistors maybe and larger transistors.
What transistors will I need to look for?

Thank John

Colin Mitchell

Aug 31, 2014
1,416
What circuit are you using?

mrmodify

Feb 13, 2010
157
Figure 1 from (*steve*) post.

Tried to copy and paste and to save image and upload but neither worked.

Colin Mitchell

Aug 31, 2014
1,416
Fig 1 is badly worded. It is only a LED flasher.

You need a flip flop circuit.

mrmodify

Feb 13, 2010
157
Got it, Thanks again here is what I wound up doing.

Attachments

• Oil Pressure Circuit.jpg
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Bluejets

Oct 5, 2014
5,705

Wondering why you don't just use a flashing LED ?
Supply from ignition switch and parallel to your existing oil warning lamp.
Basically, oil pressure low switch turns on the LED.

Attachments

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mrmodify

Feb 13, 2010
157
I thought of that and would have been very easy but I did not want to drill any holes or modify the instrument cluster.

The bike has one big speedo and 4 lights, Oil, Turn, brights, & Blinkers.

This circuit parallels the OEM oil circuit which is only oil level not pressure. I am using the same light. Blinking is oil pressure and constant on is level.

When key is turned on the light comes on for 3 seconds then flashes till bike is started.

Feb 13, 2010
157

Attachments

• Oil Pressure Circuit.gif
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Bluejets

Oct 5, 2014
5,705
Sorry but I can't see your circuit working at all.
Am I to assume correctly that what you have written in#12 is what you want, and the circuit you provided is how you think it would work???

You quote needing 2 states of operation.
1 from oil pressure and 1 from oil level but you only have an oil pressure sensor.
How do you intend sensing oil level??

mrmodify

Feb 13, 2010
157
There is two states of operation the oil level is already on the bike. Power is supplied to the oil light to the oil level switch which at a set level the switch grounds. All i did was tied in to the wire that goes to the level switch. I dont understand the circuit but it works. I built it on my bread board and it worked. I have assembled on a pc board but it did not work last night. Will trouble shoot tonight

Bluejets

Oct 5, 2014
5,705
You show the switch as oil pressure.
Oil pressure cannot show level.

Well, unless you run out of oil, then it will be assumed the level is low as the switch will activate on loss of pressure.

mrmodify

Feb 13, 2010
157
You show the switch as oil pressure.
Yes this is the added circuit for oil pressure. The oil pump in this engine is driven by a chain that why I wanted some type of indication.

Oil pressure cannot show level.
The circuit I updated is the circuit for oil pressure.
The oil level circuit is OEM. I only tied into the circuit to use the oil light because I did not want to modify the instrument cluster. I tied this circuit into the wire going to the oil level switch.

Well, unless you run out of oil, then it will be assumed the level is low as the switch will activate on loss of pressure.
Which by then it is to late for the engine. But this is correct. I can have a oil level with no oil pressure but I cannot have oil pressure with no oil level.

The circuit did work, I connected it to the bike and when key is turned on a steady oil light will come on for 3 seconds then the oil light will pulse because the engine Is not running. Light will go off when oil pressure is established.

Bluejets

Oct 5, 2014
5,705
All I can say is something's missing from your circuit then.

mrmodify

Feb 13, 2010
157
What is missing? I come to this site to try to learn and get ideas and help when ever I can.