LazyTurtle
Active member
- Joined
- Apr 18, 2017
- Messages
- 43
Hi,
I´m trying to understand how ratio is controlled in a FET compressor (1176 for example) and still don´t get it. While having the FET in the ohmic region, its rds can be controlled using a control voltage in the gate. If used as a VCR in a voltage divider the FET can control the output voltage using DC control voltage at its gate.
I understand that, if ratio is pushed to higher gain reduction, this Control voltage (in N channel JFET) must be turned to higher values (from negative to 0V), reducing rds and, therefore, reducing the outpu voltage. As a compressor must be dinamically dependant on the signal this control voltage must be varied in function with the signal asigning more reduction depending on the threshold and signal level.
Is there info on how this works exactly and is there any equation/function/method to easily configure ratio in a fet compressor?
Thank you in advance for your answers.
I´m trying to understand how ratio is controlled in a FET compressor (1176 for example) and still don´t get it. While having the FET in the ohmic region, its rds can be controlled using a control voltage in the gate. If used as a VCR in a voltage divider the FET can control the output voltage using DC control voltage at its gate.
I understand that, if ratio is pushed to higher gain reduction, this Control voltage (in N channel JFET) must be turned to higher values (from negative to 0V), reducing rds and, therefore, reducing the outpu voltage. As a compressor must be dinamically dependant on the signal this control voltage must be varied in function with the signal asigning more reduction depending on the threshold and signal level.
Is there info on how this works exactly and is there any equation/function/method to easily configure ratio in a fet compressor?
Thank you in advance for your answers.