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  1. Tha fios agaibh

    DC motor undervoltage (continued)

    Chris got me thinking about motors in another post I agree that a DC motor will draw less current with less voltage especially without a significant load on it. But if the voltage and current go down, so does the power and the amount of torque developed. If the torque demanded of the motor...
  2. Tha fios agaibh

    led driver selection for project

    I am building a house number placard for the front of my house, that use 6 to 9 leds to illuminate each of the 4 numbers in my sign. http://www.surrounding.com/Products/Luxello/Modern_LED_House_Number_5_Outdoor.asp The customer support people say to run 12 to 16v ac or dc to supply it, but I...
  3. Tha fios agaibh

    555 monostable help

    Hope i can get some direction designing a timer circuit. What i want is a 5 second "on delay" on power up that would drive a monostable timer which would give a "one shot" of about 1/2 second to fire a small relay. I have seen many examples using a push button or neg trigger but only one timer...
  4. Tha fios agaibh

    scr driver circuit for battery charger

    I have several 3phase 36volt battery chargers (fork lift battery) with bad control boards. Replacement of these obsolete boards are hard to find and near the cost of replacing the entire charger. I was wondering if it's feasible to design a simple circuit that could drive the 3 internal scrs...
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