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Recent content by Lloyd Atkinson

  1. L

    Using a transistor to enable/disable power to IC's

    Yes I looked at MOSFETS online (I've not used them much yet) and I couldn't find any that were suitable for low voltages like this, but then again I may not have been searching with the right keywords. What value would be suggested for the base resistor to the PNP? Also, what calculation is...
  2. L

    Using a transistor to enable/disable power to IC's

    Hi, Thanks for all the replies, it's been a great help! I've been using this: https://www.wisc-online.com/objects/ViewObject.aspx?ID=SSE1002 to help me understand saturation better. If I used a PNP transistor instead, would I still not need to use a base resistor as suggested by Audioguru for...
  3. L

    Using a transistor to enable/disable power to IC's

    Hi, Thanks for the replies, they have been very useful. "While the EEPROM is writing, it comsumes 5mA (1000 times the standby current). The BC547B has a gain of about 200, so you will need an extra 5000/200 = 25uA into the base while the EEPROM is writing." Can you explain this a little, do...
  4. L

    Using a transistor to enable/disable power to IC's

    Hi, I'm making a small battery powered temperature logger, so I'm trying to create a circuit that will make sure the battery life last's for as long as I can make it do so. I've come up with the idea of the microcontroller I'm using in the design to be able to use a transistor to be able to...

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