Output is not following the input
Not sure I understand your idea, however if you put the darlington in the feedback loop of your op amp then that will give you a current boosted op amp.
I have setup the Op Amp-Current booster circuit as shown below using LM324 & 2N2222 for loads 33/68/100 Ohms one at a time.
But the output voltage is not following the input as shown below:
INPUT(40mA max)// EMITTER VOLTAGE// DEVIATION //SUPPLY(10V/200mA max)
0 // 0 // 0 // 10,< 100mA
0.5 // 0.4 // 0.1 // 10,< 100mA
1 // 0.9 // 0.1 // 10,< 100mA
1.5 // 1.3 // 0.2// 10, 100mA
2 // 1.8 // 0.2 // 10, 100mA
2.5 // 2.3 // 0.2// 10, 100mA
3 // 2.7 // 0.3// 10, 100mA
3.5// 3.2 // 0.3// 10, 100mA
4// 3.6 // 0.4 // 10, 200mA
4.5 // 4 // 0.5 // 10, 200mA
5 // 4.3 // 0.7 // 9.8, 200mA
5.5 // 4.3 // 0.7 // 9.8, 200mA
6 // 4.3 // 0.7 // 9.8, 200mA
6.5 // 4.3 // 0.7 // 9.8, 200mA
7 // 4.3 // 0.7 // 9.8, 200mA
7.5 // 4.3 // 0.7 // 9.8, 200mA
8 // 4.3 // 0.7 // 9.8, 200mA
8.5 // 4.3 // 0.7 // 9.8, 200mA
9 // 4.3 // 0.7 // 9.8, 200mA
9.5 // 4.3 // 0.7 // 9.8, 200mA
10 // 4.3 // 0.7 // 9.8, 200mA
Anomalies:
1. Output is not following the input
2. After 5V input, the output is struck at 4.3V
3. Supply voltage dips to 9.8V when input is >= 5V
4. Deviation incraeses as the input voltage and set at 0.7 level
5. The measurement is repeated for inputs set at 10mA max & 100mA max. But the issue continues.
6. Can I use complementary emitter follower for my above application by leaving the Op Amp?