7 Volt Fuel Gauge Regulator

[3Phase]

Original Yamaha resin-encapsulated 7 Volt regulator circuit uncovered with a 5ms application of a kinetic resin remover:





Prototype replacement 7 Volt regulator circuit:





I'll know if it works tomorrow....


Regards,

Scott

[skids]

I once used an integrated circuit volt regulator, but it was a 7.5 volt type. It worked OK but when the tank it full it registers as WAY full. If you can find a 7 volt IC VR, you wouldn't have to reinvent the wheel... These things are very small BTW.

[bigb9582]

i wonder if geezer could make a good one of these. he makes a damn good replacment reg/rec.
geezer if u read this, do u think its possible??

[randy]

skids,

all IC voltage regulators are programmable, see the bridge formed by r1 and r2 above. r2 is variable for fine tuning the output voltage.

[skids]

That is good to know. It is over my head however.

Originally posted by randy
skids,

all IC voltage regulators are programmable, see the bridge formed by r1 and r2 above. r2 is variable for fine tuning the output voltage.

[3Phase]

It works

This is great! Thank you, skids, I was hoping someone else had repaired one of these things or found something else that worked!

The tank sender and the gauge needle are both, within reason, adjustable. With the adjustable voltage regulator set to 7 Volts I have a working fuel gauge with the needle in the correct position according to the factory sender resistances. All that's left to do is add the safety and circuit protection components to keep all the smoke inside the regulator so it won't leak out and set me, the bike, or anyone else on fire.

The LM317T I used is the same TO-220 form factor (black body with funny numbers and letters printed on it with the little metal tab with a hole on top and three metal legs at the bottom) as whatever the component was that Yamaha used. It came with a heatsink and it should all fit back in the box.

Yay! My gauge works!


Regards,

Scott