I am making a low frequency amplifier and have it complete up until the stage I pictured:
The problem is something to do with the capacitor and speaker. I removed the cap and speaker and attached a pot from the emitter straight to -9V. At first it looked fine, emitter signal looked the same as the base signal, but as I was rolling the potentiometer resistance down I noticed at about 2k the signal got all weird and distorted. Here is a picture of the signal going into the base of the transistor:
And here's a pic of the signal coming out of the emitter when the cap and speaker are connected just like in the first picture:
The speaker is 4 ohms and the sine wave is about 5Vpp. Also the power supply and the BJT are rated at 2A.
Any ideas of where I'm going wrong? Thanks and sorry for the big pictures .
The problem is something to do with the capacitor and speaker. I removed the cap and speaker and attached a pot from the emitter straight to -9V. At first it looked fine, emitter signal looked the same as the base signal, but as I was rolling the potentiometer resistance down I noticed at about 2k the signal got all weird and distorted. Here is a picture of the signal going into the base of the transistor:
And here's a pic of the signal coming out of the emitter when the cap and speaker are connected just like in the first picture:
The speaker is 4 ohms and the sine wave is about 5Vpp. Also the power supply and the BJT are rated at 2A.
Any ideas of where I'm going wrong? Thanks and sorry for the big pictures .