doronb
Branch Unspecified
28 Jan 2009

# looking for a circuit's name

hi everybody,
i am new to this forum,
a mechanical engineer who works as a tour guide but in my free time trying to develop some stuff.

i am looking for a circuit scheme but do not know how it should be called.
(my mother's language is not english)

the circuit should act like this :

1. there is a DC source that varies between 9V to 12V (3v dynamo + 9v dc battery)
2. there are 4 bulbs.
3. i wish to light 1 bulb if the voltage is 9V.......
light 2 bulbs @ v=10V, light 3 bulbs @ v=11V, light 4 bulbs @ v=12V.
4. it should probably consist of diods and/or transistors.

doronb

silverscorpion

Branch Unspecified
28 Jan 2009
this circuit should probably be called a voltmeter because that's what it does. Well, a circuit which indicates the approximate voltage at that point. you can use opamps here as comparators. Use four op amps, give 9v as one input to all the opamps, 12v as the second input to one opamp, and for the rest of the opamps, use voltage divider and set 10 and 11v as reference input respectively.

Well, I cant really explain here, without a diagram. I'll probably give you a schematic soon.

doronb

Branch Unspecified
28 Jan 2009
well, silverscorpion,
it seems that you got me right,
i don't know what op's are, EDIT : oops, i learned this issue in Hebrew - i do know what op's are.
and a scheme will be VERY helpfull.
thnx 4 the fast reply though.
doronb

priyank_180

Branch Unspecified
04 Feb 2009
it may be a vtg 2 freq converter... whch can count acodance with the amplitude of input voltage ..... 1st it convert vtg in to pulse ... and acroding to this pulse we can blow the bulbs...

icehari

Branch Unspecified
04 Feb 2009
silverscorpion
this circuit should probably be called a voltmeter because that's what it does. Well, a circuit which indicates the approximate voltage at that point. you can use opamps here as comparators. Use four op amps, give 9v as one input to all the opamps, 12v as the second input to one opamp, and for the rest of the opamps, use voltage divider and set 10 and 11v as reference input respectively.

Well, I cant really explain here, without a diagram. I'll probably give you a schematic soon.
i agree with you.... this circuit is similar to voltmeter...