Tagged Questions

0
votes
1answer
399 views

Make a symmetrical power supply with a single power source

I need to read a strain gauge with some opamps. To keep the project simple, I wanted to power it with a single battery. I need to power the strain gauge with 10V, so my battery is going to be more ...
2
votes
2answers
150 views

Voltage Controlled Oscillators

I want to know how to calculate the gain of a VCO. I've looked online and see that there exists a formula $$K_{VCO} = \dfrac{f_1-f_2}{V_1-V_2}$$ but it would seem that this result would give ...
0
votes
3answers
753 views

Power supply with opamp and BJT transistor

I am studying for my EE exam but I couldn't quite get how this circuit works. Source Assume R1 = R2, Vout = 10V Vref = 5v. This is stable as it is, and when Vout decreases for a reason below 10V, ...
3
votes
4answers
560 views

Current regulation - oscillation problems

I'm playing around with opamps trying to build power supply for lead acid battery charger, but in general i want to learn a bit about opamp based design. I'm stuck with constant current mode. I'm ...
0
votes
1answer
122 views

THS6002 “Dual Differential Line Drivers and Receivers”. Output: 15 MHz

I made ​​a PCB with the THS6002 chip "Dual Differential Line Drivers and Receivers". I copied the application example of figure 59 in the datasheet (page: 34), with three differences: the transformer ...
2
votes
4answers
876 views

Need help with use of LM358, microcontroller and +/- power supply

I have signal in 0-5V range and would like to amplify it to 0-10V. For that I am using LM358, but I have a bit of trouble with that. I have naively designed the circuit like so: I tried to supply ...
0
votes
2answers
849 views

Can I use a voltage divider and/or voltage follower to produce 1V from 9V for an op-amp oscillator?

For a circuit I'm building, I'm using an op-amp oscillator to generate a sine wave. The sine wave will have a maximum voltage of 1V and a minimum voltage of -1V. The circuit will be powered by a 9V ...
4
votes
4answers
1k views

Relationship between PSRR and gain

Wikipedia says that power supply rejection ratio (PSRR) is the ratio of output noise referred to the input vs noise at the power supply: The PSRR is defined as the ratio of the change in supply ...
8
votes
3answers
2k views

OpAmps - Single Supply or Dual?

I'm trying to pick an op-amp and I'm having trouble figuring out if the op-amp needs a positive and a negative power supply or if I can connect it to ground and the positive supply. What do I need to ...