Can anyone suggest me a simple circuit to shift a 0V/5V sine wave (low freq, under 50KHz) to a sine wave -2.5V (when was 0) to +2.5 (when was +5V).
I have used a circuit for shift a 0V/5V sine wave (low freq, under 50KHz) to a sine wave -10V (when was 0) to +10 (when was +5V). The circuit used is shown below
The 2.5V is given through a 1K POT with pin-1 –> 12V and pin-2 –> 0V, middle pin of POT is connected to Inverting pin of OPAMP (at 10KOhm resistor). The output was -10 to +10V sine wave.
In another case, i need a output of -2.5 to +2.5V output when input is 0 to 5V sine wave. Using the same setup but changing the gain deciding resistors (i.e, Gain = 1), the offset voltage is applied through POT. the output was 0 to 5V which is same as input. can u please help me out.
Best Answer
If you change the two resistors to be the same you'll get -2.5V out with 0V in.
Now the problem is that the gain is +2 from the input. You want a gain of 1 so attenuate the input with a voltage divider.
simulate this circuit – Schematic created using CircuitLab
If you simulate this you'll find that the output at 50kHz is a bit less than +/-2.5V because the LM741 has trouble keeping up with the relatively high frequency.
An almost equally ancient FET amplifier such as TL081 will keep up, or you can use something more modern that will work from lower voltage supplies.