![operational amplifier - Simplest automatic gain control circuit with BJT + op-amp - Electrical Engineering Stack Exchange operational amplifier - Simplest automatic gain control circuit with BJT + op-amp - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/a4Ai4.png)
operational amplifier - Simplest automatic gain control circuit with BJT + op-amp - Electrical Engineering Stack Exchange
![VCA821: Refer to the VCA data manual (Figure 1), and design the automatic gain control circuit (Figure 2) in Multisim for simulation experiments. Experiments result shows tha this circuit does not achieve VCA821: Refer to the VCA data manual (Figure 1), and design the automatic gain control circuit (Figure 2) in Multisim for simulation experiments. Experiments result shows tha this circuit does not achieve](https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/14/VCA821_5F00_DATASHEET.png)
VCA821: Refer to the VCA data manual (Figure 1), and design the automatic gain control circuit (Figure 2) in Multisim for simulation experiments. Experiments result shows tha this circuit does not achieve
![operational amplifier - Automatic gain controller gain action - Electrical Engineering Stack Exchange operational amplifier - Automatic gain controller gain action - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/j3Soc.png)