I had a post over in Auto, but I now know more about how this switch works. It is approx. 14mm x 14mm square. It is about 25mm tall. It has 3 solder legs. The switch has little clicks as it rotates. It also rotates continuously. The center leg is ground. The 2 outer legs are N/O. When you rotate it in either direction it momentarily grounds out, or sends a brief ground pulse to the main head unit. That ground pulse turns "up" or "down" the speed of a fan blower. There are a total of 5 speeds.
I have bought 2 types of pulse switches, but because of there PWM square wave, the pulses are either too fast or it doesn't really send a momentary ground pulse. Basically it is a spring loaded momentary thing. I tested it by wiring 2 momentary switches and with a quick push the fan goes up with pushing the one button and the other button quick push lowers the speed.
I cannot find anything in Panasonic, Alps, or anything that fits the size and type of the one I have now. It is possible there is not such product out there. It is out of a 20 year old product.
Stu
I have bought 2 types of pulse switches, but because of there PWM square wave, the pulses are either too fast or it doesn't really send a momentary ground pulse. Basically it is a spring loaded momentary thing. I tested it by wiring 2 momentary switches and with a quick push the fan goes up with pushing the one button and the other button quick push lowers the speed.
I cannot find anything in Panasonic, Alps, or anything that fits the size and type of the one I have now. It is possible there is not such product out there. It is out of a 20 year old product.
Stu