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Battery voltage ?

Discussion in 'Electronic Basics' started by bench, Apr 25, 2004.

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  1. bench

    bench Guest

    Hello all,

    Is there any particular reason why a circuit which doesn't
    have any ic's, i.e. only passive components + diodes +
    transistors, would not be able to operate with a 1.5V
    battery. For example, this oscillator circuit here
    will it work with a 1.5V battery, or even with a 1V
    battery (assuming at some stage the battery is not going
    to be 100% full)
  2. Gary Lecomte

    Gary Lecomte Guest

    3 volts maybe, if you change some resistor values. But also a definate
    loss in output power, not that there is much to start with.

  3. In the above circuit, Q2 is biased so that it will oscillate weakly with
    only 1.5V supply voltage. But Q1 is biased such that it won't turn on
    with a supply voltage of 1.5V. You will have to change the bias
    resistors to make it work.
    On this same site, there is this circuit, which uses a different biasing
    scheme to make it work with 3V, and probably down to 1.5V. I would
    reduce R1 and R3 for this lower supply voltage.
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