A current source provides a constant current. Choose a topology that suits your current and voltage overhead requirements. Some examples are shown on https://en.wikipedia.org/wiki/Current_source
For that circuit your load is connected between the supply voltage and the collector of the transistor as shown in the attached circuit (copied from the wikipedia page linked above).
If you connect a load of the emitter side (in series with emitter resistor) the load will affect the current drawn. The only case this is acceptable is if the load has a constant resistance, or is much smaller than the emitter resistor: in the former case the current will remain constant, in the latter, it will not change much.
i am making a simple supply with no use of regulators that can be inputed by 6v-9v and will regulate a 5.1v w/ a current of 200mA ..and there are two conditions
a)w/ load-R2 is not remove
b)no load-R2 is remove or short circiut
i am making a simple supply with no use of regulators that can be inputed by 6v-9v and will regulate a 5.1v w/ a current of 200mA ..and there are two conditions
a)w/ load-R2 is not remove
b)no load-R2 is remove or short circiut
Or do you really only need a constant voltage of 5.1 with a current capacity of up to 200mA? If so, then all you need is a simple LDO voltage regulator.