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Battery voltage ?

B

bench

Jan 1, 1970
0
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
http://www.uoguelph.ca/~antoon/circ/fmt1.htm
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)
 
G

Gary Lecomte

Jan 1, 1970
0
bench said:
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
http://www.uoguelph.ca/~antoon/circ/fmt1.htm
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)

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.

Gary
 
W

Watson A.Name - \Watt Sun, the Dark Remover\

Jan 1, 1970
0
bench said:
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
http://www.uoguelph.ca/~antoon/circ/fmt1.htm
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)

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.
http://www.uoguelph.ca/~antoon/circ/fmt3.htm
 
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