- on Power Supplies
- Published in issue 12/2002 on page 0
Switchable Current Source
The circuit diagram shows a simple current source constructed from discrete components, which can deliver a constant current into a load connected to ground. The circuit can be switched on and off using transistor T2.Optimum temperature compensation can be achieved by using a BC857S dual PNP transistor with the left-hand half connected as a diode.