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  1. Moonwalker031

    Zero-Cross detect circuit

    I am using a Triac dimmer for dimming an LED (dimmable) lamp. The zero-cross detector is from a simple transistor on the secondary of the transformer (before smoothing). All works fine except that the LED flickers a bit in the low range. Analyzing on the scope the zero-cross pulses vary in the...
  2. Moonwalker031

    Dimmer

    I have disigned a dimmer circuit using Pic12F629. It works fine but with a little electrical noise the pic is resetting. I have added L1 and L2 inductors (see circuit) and some capacitors across the supply but did not solve it completely. Any idea how to make Pic completely immune to mains...
  3. Moonwalker031

    Hbridge design

    I am designing an H bridge using the FDMS7556S mosfet. The datasheet states - "This device has the added benefit of an efficient monolithic Shottky body diode." Does this mean that I can omit the catch diodes?
  4. Moonwalker031

    SR04 ultrasonic module for outdoor use

    I've been looking for (cheap) outdoor ultrasonic sensors but could not find any assembled in a module (except Maxbotix which are out of budget). So I am thinking if changing the transducers on the SR04 module to waterproof type might work. Any feedback is welcome. My application is for a trip...
  5. Moonwalker031

    Waterproof connector 30A

    I just bought this connector ***p://www.ebay.co.uk/itm/191278895319?tfrom=191405132575&tpos=unknow&ttype=price&talgo=origal It says 30A rated but on arrival I found the contacts to be only 1mm diameter which I really doubt they can handle 30A. So can someone point me to a similar connector...
  6. Moonwalker031

    Auto stand up electric motor bike

    I was seeing Discovery channel and they featured an electric motor bike that can stay standing by itself. This was a normal 2 wheel bike so I cannot figure out how it is possible to stay standing up by just actuating the motors. Any idea on the principle used?
  7. Moonwalker031

    DC motor PWM flyback diode

    I have a simple circuit for controlling the speed of a 12V 10A dc motor using 1 mosfet on the low side. For cost reduction I opted for no heatsink and chose a mosfet with the lowest RDSon. This worked well with no much heating. However I am getting a lot of heat in the flyback diode. I tested...
  8. Moonwalker031

    Ethernet over 500m (underwater)

    Hi I am an electronics engineer and just subscribed to this forum. Its very informative - keep it up. I have a project for building an ROV. Maximum depth is around 400m but I'm planning to use a cable of 500m for drag compenstion. My idea is to use IP camera on the ROV and send the commands via...
  9. Moonwalker031

    Transmitting Ethernet over 500m underwater

    Hi I am an electronics engineer and just subscribed to this forum. Its very informative - keep it up. I have a project for building an ROV. Maximum depth is around 400m but I'm planning to use a cable of 500m for drag compenstion. My idea is to use IP camera on the ROV and send the commands via...

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