First I'm posting this b/c my situation has changed. I fried the original circuit board so now I just want to power the heating pad safely.

Is it as simple as connection a switch and resister straight to the heating element or would that burn up the element. Actually, It's the heat wiring if that makes a difference.

The unit says 60Hz/ 49Watts/ 120V if that info is needed

 

Typically, heating pad controls are junk. I have 2 that read the same for off and low, then read the same for medium and high. I just shorted out the switch and built a box with a $10 light dimmer, a timer, and a duplex receptical where I plug in an LED night light and the heating pad. Set the dimmer to 3 out of 10 for 35 minutes and I'm properly cooked.

 

Yes, but I'm looking for a simply schamatic for under a couple buck to reduce the watts by 50-60 percent.

 

I should have saved the drawing for the half power soldering iron.
Just stick a diode in series with the heating pad. 1N4007 should work.

 

Try the AC dimmer control by Triac.

The circuit is easy, you can diy or buy the product from local store, I was built it for the fan speed control, the Iron temperature adjust, and I also bought it from the store, it cost about $US3.333.

 

Try the AC dimmer control by Triac.

The circuit is easy, you can diy or buy the product from local store, I was built it for the fan speed control, the Iron temperature adjust, and I also bought it from the store, it cost about $US3.333.

Will this work with 110V?

 

Will this work with 110V?

It's ok for AC110V or AC120V, here in Taiwan is AC110V, I think your heat pad only 49W, so you only need the TRIAC BT136.

Here has some circuits but it's Chinese version, I think it's ok , because you just need to see the circuit, that is suitable for AC110V.

 

It's ok for AC110V or AC120V, here in Taiwan is AC110V, I think your heat pad only 49W, so you only need the TRIAC BT136.

Here has some circuits but it's Chinese version, I think it's ok , because you just need to see the circuit, that is suitable for AC110V.

Thanks for the info. Should I use the first or second diagram?

 

Thanks for the info. Should I use the first or second diagram?

The first circuit in this file, and using BT136 or similar type.