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  1. TenderTendon

    Help With DC Motor Speed Controller

    Hello, I recently purchased a battery operated vehicle for my 2 year old grandson. It has a 12V lead acid battery and a momentary pushbutton controlling the motor. The first thing I noticed was that the switch was connected directly to the motor, so the inrush will kill it pretty quick. The...
  2. TenderTendon

    Capacitance rules...

    The rules involving capacitors in series and in parallel have always confused me. Even today, when I see a little subject involving a simple DC power supply filter, I still scratch my head. The confusion comes from the fact that when putting 2 capacitors in parallel, the capacitance is doubled...
  3. TenderTendon

    Need to build a simple PWM generator

    Hello everyone, I recently had to replace the heater core in my car and while I had the fender off, I decided to replace the blower motor too. I'm going to ditch the old resistor speed control system and replace it with a modern PWM speed control. I am going to use a Toyota blower control...
  4. TenderTendon

    Microcontroller controlled by pushbutton for LED flashlight

    Hello, I want to make an electronic switch that will handle 5a dc, at no more than 5v. It will be controlled by a miniature tactile dome momentary switch. Operation is as follows: I want the output to be momentary if the switch is pressed for <500ms, mantained if pressed for >500ms. I was...
  5. TenderTendon

    Olympus Keymed KS-2 ultrasonic cleaner

    This has been my workhorse for many years. I use it almost every day and really rely on it. Recently it has been giving me nothing but headaches. I'm about to give up on it. A couple months ago, I noticed the tank agitation drop to almost nothing. Tore it apart and found one transducer broke...
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