k7elp60
Active Member
I recently designed this multicoupler for use on 3 to 30Mhz. It's purpose is to be able to use one antenna and two receivers. I am using the NE5539 as I had some in my personal stock. The NE5539 is used as a gain stage feeding some emitter followers.
My questions are:
1. Do I need a resistor between the output of the NE5539 and the input of the emitter followers to prevent oscillation.
2. Or can I just connect the output of the 5539 directly to the input of the emitter followers.
3. Are the bias resistors for the 2N2222 the right values?
4. Is the output impedance of the emitter followers 51 ohms?
Any and all suggestions welcomed.
Schematic and data sheet of NE5539 attached.
Ned
My questions are:
1. Do I need a resistor between the output of the NE5539 and the input of the emitter followers to prevent oscillation.
2. Or can I just connect the output of the 5539 directly to the input of the emitter followers.
3. Are the bias resistors for the 2N2222 the right values?
4. Is the output impedance of the emitter followers 51 ohms?
Any and all suggestions welcomed.
Schematic and data sheet of NE5539 attached.
Ned