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Simple Electronic Circuit

Discussion in 'General Electronics' started by Jon, Jan 27, 2004.

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  1. Jon

    Jon Guest


    I was wondering how I would go about making this circuit:

    A Switch and 9V battery powering an LED. When the switch is on, the
    LED is on, but blinking. My goal is to do this with simple components
    like capacitors and resistors. Because of the restriction of 9V power
    supply, I can't use OP amps or other 5V ICs..

    Any help would be appreciated!
  2. Bill Vajk

    Bill Vajk Guest

    Radio Shack 276-036 or 276-305 or 276-308. Be sure to add circuitry
    to drop the voltage, but the blinking is all done for you out of the
  3. Fred Stevens

    Fred Stevens Guest

    I can't count how many times I've heard this myth that op-amps can't
    be run from a single 9V supply!

  4. GPG

    GPG Guest

    Posted earlier, but did not appear
    Use a blinking led: eg
    Op amps are not 5V devices, nor are many logic families.
  5. Quark Ng

    Quark Ng Guest

    Not only is the myth that op-amps can't be ran from a 9V supply is
    false. It is also false to think that you can't run logic (5V) IC's
    if your only power is a 9V battery.

    Check out LDO regulators. (do a search on "LDO" at
    They can provide you with a nice clean 5V if you give it 9V.

    Now, you don't even need 5V anyways. Check out a "555" timer chip.
    With that, you can even control the frequency and duty cycle of your


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