Hello,
I'm fairly new to electronics and i built myself a PWM circuit for fan speed control.
I used below schematic and i built it on breadboard first. It worked fine.
http://www.afrotechmods.com/groovy/PWM_tutorial/PWMcircuitwithmotor.jpg
Only difference is that i added a capacitor (25V, 470uF) in parallel to motor and diode to reduce humming sound.
So i decided to build it on perfboard (single copper holes). This was my first built btw.
My problem is that output voltage is constant at 12V, no matter what the pot resistance is. I checked the connections they seem correct.
As this is a very straightforward and aged circuit, i thought you might know what would cause this issue. Could you please help me troubleshoot the circuit? Could the transistor be damaged? It was very hot to touch while soldering and I had to use bit heat due to multiple single connections on perfboard.
I'm fairly new to electronics and i built myself a PWM circuit for fan speed control.
I used below schematic and i built it on breadboard first. It worked fine.
http://www.afrotechmods.com/groovy/PWM_tutorial/PWMcircuitwithmotor.jpg
Only difference is that i added a capacitor (25V, 470uF) in parallel to motor and diode to reduce humming sound.
So i decided to build it on perfboard (single copper holes). This was my first built btw.
My problem is that output voltage is constant at 12V, no matter what the pot resistance is. I checked the connections they seem correct.
As this is a very straightforward and aged circuit, i thought you might know what would cause this issue. Could you please help me troubleshoot the circuit? Could the transistor be damaged? It was very hot to touch while soldering and I had to use bit heat due to multiple single connections on perfboard.