Creating a cascaded amp with high gain

Discussion in 'The Projects Forum' started by mattswk, Dec 6, 2014.

  1. mattswk

    Thread Starter New Member

    Jul 22, 2014
    Hi I've attached the schematic of my circuit here. I'm trying to create a gain of at least 4 over the R6-labeled, 8-ohm resistor. I have a common emitter cascaded with a common collector configuration. My only limitation is that the R3 resistor must be 10k ohms, V4 and V3 must be 15 volts, and V2 must be 100mV peak to peak. All other values may be changed, including the bias voltage V1, the capacitors, and the other resistors. I can not add of remove components. I can only change their value. However, I can use either BJT 2N2222 or CD4007 MOSFET.

    Now, although in simulation I get a gain of around 10, this is not true when actually testing the circuit so I believe I need a gain much higher than 10, say about 30 or 40 perhaps. I need to figure out the values of the resistor and bias voltage to get a high gain. Any help is appreciated. I haven't posted in awhile so I apologize in advance for any beginner mistakes in this post.
  2. Brownout

    Well-Known Member

    Jan 10, 2012
    First thing I would do is remove R2. It's not needed or wanted.