Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Q1 and Q2 are a constant current source. You must learn about how transistors work and learn Ohm's Law to understand their simple operation.
You were told how they work on the other website.
The CD4017 operation is described in its datasheet. It is a sequencer that makes one output pin go high in sequence each time a clock pulse goes high on its clock pin 14.
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