Battery voltage ?

B

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
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)
 
"bench" <bench@neti.com> wrote in message news:<c6ghs7$61v$1@news.epidc.co.kr>...
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)
Click to expand...
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
 
"bench" <bench@neti.com> wrote in message
news:c6ghs7$61v$1@news.epidc.co.kr...
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)
Click to expand...
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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