I'm designing a kind of light sequencer, in which a 4017 counter should light up incandescent bulbs (one at a time). It works, but the bulbs glow very faintly. I guess it has something to do with the driver circuit shown below.
**broken link removed**
The transistor is a small signal BC547B (max Vce=45V, max Ic=100mA, hfe=200).
When the 4017 output is 12V, V_Bulb is only about 11V.
It's a simple circuit, so it should work, I think...
Any ideas? Would it help to have a resistance between the base and the 4017 output?
/Christian