I generated a 29 kHz sine wave using an STM32 DAC periphal. The sine wave has 2.96 V output, but I need to make it at least 10-12 V. I tried using TL084, OP07CP, AD620 but the TL084 and OP07 don't amplify it. The AD620 makes the output voltage around 4.5V but it becomes square wave (gain was supposed to be 4). Supply voltages are +15V and -15V.
I also tried some transistor circuit designs but the transistor makes my signal square.
How can I amplify my 29 kHz signal?
simulate this circuit – Schematic created using CircuitLab
Best Answer
It should work. If you are expecting a sine wave that is centered about approximately 0V either couple it capacitively (eg. 100nF from the MCU and 10K from the op-amp non-inverting input to ground) or add a resistor as so:
simulate this circuit – Schematic created using CircuitLab
But it still should work as drawn, the sine wave will just be offset by +4.3 * 1.5V = 6.45V and will be just short of saturating near the positive rail.