Questions tagged [widlar]

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Widlar current source : get \$ I_{C1} \$?

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

So I know about the advantages of using a Widlar circuit being More control on how you can charaterise the output current Addition of the extra resistor allows you to generate smaller currents What ...
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3answers
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How is the 741 op-amp output protected when shorted to V+?

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-...