Questions tagged [widlar]

I have completed my answer to the question about the Widlar's limiting circuit but there is something unclear to me - how the transistor Q22 manages to limit the load current when the output is short-connected (in blue) to V+ or ground. The usual…

I have designed the circuit shown below for a reference current of approximately 1mA and an output current of approximately 100uA. I have observed that I am able to supply approximately 100uA to load resistances up to ~50kOhm. Afterwards, the output…

from the Widlar schema that you can see, from here, i don't know how to retrieve this formula : $$ I_{C1} = {\beta_1 \over {\beta_1+1}} \left( I_{R1} - {I_{C2} \over \beta_2} \right) $$