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Articles from 3lectrix

  1. 3lectrix

    Water Level Alarm

    This circuit will produce an audible alarm when the water level reaches a preset level.The circuit
    5/5, 1 vote
    Updated:
    Dec 29, 2011
  2. 3lectrix

    Power Supply Failure Alarm

    Most of the power supply failure indicator circuits need a separate power supply for themselves. Bu
    3/5, 2 votes
    Updated:
    Dec 29, 2011
  3. 3lectrix

    Infrared Proximity Detector

    This proximity detector using an infrared detector (Fig. 1) can be used in various equipment like a
    0/5, 0 votes
    Updated:
    Sep 9, 2011
  4. 3lectrix

    Light Activated Switch

    The circuit is based on National Semiconductors comparator LM311 (IC1) and an LDR. The non invertin
    3/5, 3 votes
    Updated:
    Sep 4, 2011
  5. 3lectrix

    How To: Test A Uni Junction Transistor

    You can easily test the health of a UJT (Uni junction transistor) by using a digital multimeter. Do
    0/5, 0 votes
    Updated:
    Jul 2, 2011
  6. 3lectrix

    Digital Stop Watch

    A digital stop watch built around timer IC LM555 and 4-digit counter IC MM74C926 with multiplexed 7
    0/5, 0 votes
    Updated:
    Jun 17, 2011
  7. 3lectrix

    Digital Code Lock

    This is a simple but effective code lock circuit that has an automatic reset facility. The circuit
    0/5, 0 votes
    Updated:
    Jun 16, 2011
  8. 3lectrix

    Police Siren (NE555)

    Here is the circuit diagram of a police siren based on NE55 timer IC. The circuit uses two NE555 ti
    0/5, 0 votes
    Updated:
    Jun 16, 2011
  9. 3lectrix

    Dark Detector

    The dark detector circuit shown here can be used to produce an audible alarm when the light inside
    0/5, 0 votes
    Updated:
    Jun 16, 2011
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