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LED2 LED Sensor Relay Tracker Schematic

Konusu 'Elektronik Devreler' forumundadır ve guclusat tarafından 28 Mayıs 2014 başlatılmıştır.

  1. guclusat
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    guclusat Tanınmış Üye Süper Moderatör

    Katılım:
    14 Haziran 2009
    Mesajlar:
    9.755
    Ödül Puanları:
    48
    ledrely2.gif

    Circuit 1 tends to chatter the relays under certain lighting conditions as there is no built in hysteresis. This version uses a Schmitt trigger hex inverter circuit to eliminate the chatter. It works better but is more complex.Note! R4 and R5 are used to force parking when it gets dark. If parking is not desired don't use R4 and R5. Parking may not be desired in low power consumption applications.
    Also, the parking resistors, R4 and R5, reduce sensitivity a bit.

    LED5S5V Simplified LED low power tracker.


    ledtilden5v.gif

    I was looking for a much lower cost tracker for low power applications. One of these applications is a small lighting heliostat. This circuit uses small switching transistors. The maximum motor drive current is limited to about 250mA maximum at 5V.I've tested the circuit on voltages from 3V to 21V. With some component changes it should be useful to 63V in a 36V PV panel system although I haven't tried this yet. With higher voltage and the use of heat sinks on the bridge transistors much higher currents should be possible.
    The parts cost is very low. Parts cost estimated using Digikey prices. Ok, you can get stuff from the surplus stores but I will stick with Digikey.

    1. 2N2222A NPN transistor 4 @ $0.21 = $0.84
    2. 2N2907A PNP transistor 4 @ $0.21 = $0.84
    3. 430 Ω 1/4 W resistor 2 @ $0.06 = $0.12
    4. 5 KΩ 1/4 W resistor 2 @ $0.06 = $0.12
    5. 22 nF capacitor 1 @ $0.08 = $0.08
    6. LED Green Lumex SSL-LX5093LGT 2 @ $0.12 = $0.24
    Total = $2.24
    $2.24, is this cheap enough?led5s12v


    LED5S12V Simplified LED low power tracker.

    ledtilden12v.gif

    This circuit uses small switching transistors. The maximum motor drive current is limited to about 100mA maximum at 12V.

    1. 2N2222A NPN transistor 4 @ $0.21 = $0.84
    2. 2N2907A PNP transistor 4 @ $0.21 = $0.84
    3. 1.6 KΩ 1/4 W resistor 2 @ $0.06 = $0.12
    4. 47 KΩ 1/4 W resistor 2 @ $0.06 = $0.12
    5. 100 KΩ 1/4 W resistor 2 @ $0.06 = $0.12
    6. 22 nF capacitor 1 @ $0.08 = $0.08
    7. LED Green Lumex SSL-LX5093LGT 2 @ $0.12 = $0.24
    Total = $2.36 led5connections


    led5connections2.gif

    I have the LED5 series trackers for sale.

    Yes, I know, not everyone wants to build these from scratch so I made a PC board for the LED5 series.
    The single axis board is a bit less than 1/2" x 1" and the dual axis is a bit less than 1" x 1".


    LED5S12V Modified for use with a PLC.

    ledtilden12vPLC.gif

    The schematic is for the "Pull Down" variant.
     
    Son düzenleme: 27 Şubat 2016

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