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  1. Electrical
    How do I convert a continuous electrical signal to a pulse? I use a door bell as an entry chime for my retail store. Each time the door is opened is like someone ringing a doorbell (Ding Dong). My problem is that if someone holds the door open for deliveries, the one more thing conversation...
  2. HVAC
    I just replaced the old fan motor and it's now running fine. I used the same fan blades. BUT...the air is not flowing smoothly. It is pulsing. Are the blades unbalanced or something? It was doing this before the motor bit the dust (internal seals busted up etc.). It does not look like the fan...
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