almost digital sequence

01:03:54

published 11 years ago

hurz

11 years ago

You are using the transistor as a diode (base collector diode) and the opamp gives all current for your bulb. Put a resistor between opamp out and base of transistor, and adapt the bulb voltage to 4V as you supply is. Keep it up!

thebugger

11 years ago

Or place the load at the emitter and increase the collector voltage above that of the emitter to counteract the saturation of the transistor. Uc>Ub!!!

Voltransistor

11 years ago

It is shorted out from the op-amp to the NPN transistor.

Voltransistor

11 years ago

Resistor would help. Use around a 820Ω resistor or to make it more efficient, put a 5kΩ resistor with two transistors, so it's enough for the light bulb load.

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