Hi,
Can someone help me construct a circuit to dim a filiment lamp (9Vdc) using a transistor?
The bulb draws 38mA when connected to 9Vdc, so its a 0.34W bulb.
I have attached my circuit. The lamp can be shorted out by a push switch (this is a door bell push switch with intergrated lamp), so R22 (50 ohms) limits the current in the circuit to 160mA during a button press.
How do i calculate the value for the variable resistor? Is this curcuit correct?
When the button is pressed, Q6 should turn off, hence the micro detects the button press?
Can someone help me construct a circuit to dim a filiment lamp (9Vdc) using a transistor?
The bulb draws 38mA when connected to 9Vdc, so its a 0.34W bulb.
I have attached my circuit. The lamp can be shorted out by a push switch (this is a door bell push switch with intergrated lamp), so R22 (50 ohms) limits the current in the circuit to 160mA during a button press.
How do i calculate the value for the variable resistor? Is this curcuit correct?
When the button is pressed, Q6 should turn off, hence the micro detects the button press?