AC to DC power adapter

Hay hay hay

Well-known Member
This may be less controversial than yesterdays post...but maybe not. I never know what will get folks cranked up.

I have somehow misplaced the AC to DC power adapter to run the programable part of my exercise bicycle.
I can not find any voltage or amp requirement on the bike program monitor. And do not have and can not get a manual.

I bought an Enercell variable voltage adapter at Radioshack which can be set to charge at various rates between 3 and 12VDC, all at 1 A.

Question: How can I try to get this bike programer to operate without damaging the unit due to excess voltage or too little voltage?
 
(quoted from post at 10:23:04 12/19/14) This may be less controversial than yesterdays post...but maybe not. I never know what will get folks cranked up.

I have somehow misplaced the AC to DC power adapter to run the programable part of my exercise bicycle.
I can not find any voltage or amp requirement on the bike program monitor. And do not have and can not get a manual.

I bought an Enercell variable voltage adapter at Radioshack which can be set to charge at various rates between 3 and 12VDC, all at 1 A.

Question: How can I try to get this bike programer to operate without damaging the unit due to excess voltage or too little voltage?
f just electronics & no motor, too little voltage is highly unlikely to hurt it, but reverse polarity very well could damage it. Just creep up in small increments until it functions.
 
Most of these type of transformers are 12 volt. Are you positive that it is DC? The little plug in transformers can put out 12 volts ac also. Like was previously mentioned polarity is important. If you give us the brand and model maybe someone here has a way to find that exact info for you.
 
Too little voltage won't damage it. Set your adjustable unit to 3 volts and try it. If no go, step up to next setting, repeat until it works. I'd be more concerned about getting the right polarity, but generally the exposed conductor (or the more exposed conductor) is going to be the ground (DC return).
 
Does the machine work on just battery? If so that's a good place to start. That will tell you the voltage and polarity. If not, it's just guess work. Good luck.

You will find me on my 3 wheel bike before you catch me on an exercise bike.

When people go yo a gym to exercise, I ask them how much it would cost if they exercised for me?
 
Why is it so hard for you to tell us what make and model the machine is, why keep it a secret and make things difficult ? If you post the brand / model, someone will either have an ac adaoter or manual to look at to get the right voltage and polarity.
 
Exercise bikes are usually powered by the pedals. If it works by pedaling then you can measure the voltage at the AC adapter port and go from there.

It will be safest to use DC input. If the bike's original adapter had AC output, there will be a rectifier in the bike's internal electronics. The rectifier will pass the already-rectified DC from your new adapter through to the electronics, and correct the polarity if you happen to get it wrong.

If the bike's original adapter had DC output, you may have an issue with polarity. Best bet is the center pin is +, but you still run a 50/50 shot of getting it wrong.
 

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