/diy/ - Do It Yourself

Anonymous Wed Jul 11 16:38:19 2018 No.1423746 [View]
File: 1.93 MB, 946x534, cd4017 constant current sink.png [View same] [iqdb] [saucenao] [google]

I was playing around with the idea of using a CD4017 IC to control my variable transistor base drive circuit. (>>1421397)

Pic related shows the general idea.
I realized a precise constant current sink can be formed with just a single op-amp, NPN transistor and a resistor. It could be used to control the base current (I_load) of the high power PNP. Then I could use a logic counter IC + resistor divider to form the reference voltage (U_adj) for the current sink.

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/diy/ - Do It Yourself

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