That is a good possibility. I suggest this version using two transistors.

 

The signal output from the amplifier will turn on Q1 to activate the solenoid.
View attachment 343399

Thanks, would it be possible to bypass the other switches and make this work?
31501 RV Furnace Ignition Control Circuit Board For Atwood & Dometic 33488 33727

 

Seems overkill.
You have the amp board currently so would you prefer a relay module driven by the amp board to activate the solenoid?

 

Seems overkill.
You have the amp board currently so would you prefer a relay module driven by the amp board to activate the solenoid?

Yes if that would be the easiest way to make it work. I don't have a lot of experience with electronics but I can put it together if I know the right components. If there is a module that would work please let me know.

 

You mentioned a 12 volt battery, is that going to be the power source for the amp board and solenoid?
What other supplies are available and/or how do you want to power this project?

 

You mentioned a 12 volt battery, is that going to be the power source for the amp board and solenoid?
What other supplies are available and/or how do you want to power this project?

12v would probably be best but I could make either 3v with 2 D cells or 4v with lipo batteries. The solenoid came from a unit that used 3v and that's what I tested it with which worked fine. I got such a slight signal when I used 3v on the amp I decided to try 12v and was much better but still not enough to drive the solenoid. As long as there's 3v and enough amps (.22) going to the solenoid I believe it should work. If it's easier to use 3v battery supply that's fine. I appreciate your help.

 

How much voltage can you get out the amp without the solenoid connected using the 12 volt battery.
This will help knowing the best way to do this.

 

How much voltage can you get out the amp without the solenoid connected using the 12 volt battery.
This will help knowing the best way to do this.

All I have is a multimeter, it I was able to get it up to 3v briefly with a lighter but couldn't keep it there. If I put my finger on both the sensor and the burner it will stay at 3v. I can adjust the gain on the board to get more.

 

Meaning you can use your finger instead of the lighter to get a steady output voltage?
Can you get more voltage output using the lighter?

 

Meaning you can use your finger instead of the lighter to get a steady output voltage?
Can you get more voltage output using the lighter?

No, less with lighter

 

Is your plan to use your finger to activate the solenoid?
Will you have time to remove your finger before the burner kicks on?

 

Is your plan to use your finger to activate the solenoid?
Will you have time to remove your finger before the burner kicks on?

No I don't plan to use my finger, if the burner won't start with the lighter I was going to use a momentary push button switch.

 

Sounds better.
So the operation is to hold the momentary switch long enough for the burner to kick on using the lighter?
How much voltage is produced when the burner kicks on ?

 

Is there a module available like the you have in post #21

 

Sounds better.
So the operation is to hold the momentary switch long enough for the burner to kick on.
How much voltage is produced when that happens?

3v

 

Only 3 volts max output when the burner is fully on?
Probably not for the module but can be assembled on perfboard

 

if the

Only 3 volts max output when the burner is fully on?

yes, that would open the solenoid 0.22 amps, if I had it configured correctly shouldn't it be able to open the solenoid with the lighter and keep it open as long as the burner is lite?

 

I'm asking how much voltage is coming out of the amp when the burner is fully on.

 

The solenoid should open and stay open as long as 3v and enough amp

I'm asking how much voltage is coming out of the amp when the burner is fully on.

with 12v connected to the amp still less than 3v. there is not much difference weather the burner or a lighter is on the sensor. There isn't going to be a huge increase in voltage when the burner comes on.

 

Is that with gain control on the amp set at max?