All Questions
Tagged with op-amp or operational-amplifier
9,133 questions
0
votes
2
answers
117
views
Peer Review for a Mic Pre-Amp circuit
I am working on a schematic for a pre-amp for an unbalanced dynamic CB style microphone. Using various examples I have cobbled this concept together. I think I have the values pretty close, but I'm ...
1
vote
2
answers
56
views
Preventing Oscillation in Motor Driver Circuit
I have a motor driver circuit as shown below. The supply voltage is 12V, and the output is going to a load that is grounded. The eventual application will use a DC motor, but for now testing is done ...
- 1,212
0
votes
3
answers
114
views
Leaky Integrator getting Saturated
I am trying to simulate a leaky integrator in LTspice using an AD8603 op‑amp.
My long‑term goal is to model slow‑changing outputs from MOX gas sensors, but the gas sensor itself is not important for ...
- 4,445
4
votes
3
answers
329
views
How can I tell if the TLV2374 op amp is unity‑gain stable?
I'm comparing two TI op amps: the OPA4348 and the TLV2374.
The OPA4348 datasheet explicitly states that it is unity‑gain stable.
However, the TLV2374 datasheet does not clearly say anything about ...
- 4,445
1
vote
2
answers
82
views
Oscillations in current compensation circuit
TSC102IPT datasheet | SI2300DS datasheet
I'm playing around with a circuit to make a board draw a constant current. A TSC102IPT current sense amplifier is amplifying the voltage from a sense resistor ...
- 195
0
votes
3
answers
92
views
Is it ok to change the sequence of op-amps used in a quad chip?
I am trying to build a field mill to Jim Campbells design from 2001 which can be found at this web address. Electric Field Mill Fabrication
Along the top of the schematic and to the right (including ...
- 221
1
vote
3
answers
99
views
I'm planning to make a DIY digital sthetoscope, but I'm still unsure if my circuit calculation is correct
The flow should be: electret condenser microphone → preamp → low-pass filter (1,000 Hz) → high-pass filter (20 Hz) → ADC, but I’m still skeptical about my calculations and need reassurance or ...
0
votes
1
answer
72
views
Q adjustable op-amp based second order shelving filter attempt
Below is a first order high pass filter
A second order high pass would be cascading of the two RC sections in case of passive filter, but in the active variant, there is feedback given between the ...
- 357
1
vote
0
answers
117
views
Severe waveform rounding on the edges of sharp waves such as square and sawtooth waves [closed]
I’m building a custom DDS waveform generator using an FPGA. The FPGA has a 28-bit phase accumulator, and I use the top 8 bits as addresses into different ROMs to generate various waveforms (square, ...
0
votes
1
answer
62
views
Class A/B amplifier from 6V to 30V
I want to make an amplifier that works from +-6V to +-30V and this is what I have come up with for a 4 ohm speaker load, as you can see the bandwidth is pretty limited and IMHO this simple circuit ...
- 357
4
votes
2
answers
335
views
AM circuits acts unexpectedly when raising the frequency
I've made an AM circuit that works great at low frequencies (e.g. 30 kHz), but as soon as I raise the frequency (to something like 600 kHz), the output completely changes from the expected one, ...
- 121
1
vote
2
answers
124
views
Non-inverting Schmitt trigger circuit
I have encountered an issue on my board where I thought this would trigger fine up to 100kHz, however it stops at 27kHz. Input is sinusoidal signal with 600mV amplitude going through the filters then ...
- 11
1
vote
0
answers
105
views
Single ended to differential using opamps
I am converting a single ended signal to differential to be read by an ADC. I am using this TI buffer&inverter implementation.
Does it not introduce additional voltage in the actual signal because ...
- 129
0
votes
4
answers
126
views
Relaxational generator not working with single power supply
I am simulating relaxational generator using opamp in Micro-Cap.
Here is the circuit:
It works fine but I want to make it work with a single power supply.
I found that for it C1 and R1 ground pins ...
- 265
4
votes
2
answers
274
views
Is this about as good as it gets with general Bio signal/EMG front ends? Is there anything else significant missing before the ADC?
I know a Right Leg Drive helps but I will not be using one.
Is it a lot better to buffer the Ref electrode input as opposed to just connecting the electrode straight in?
Is there anything missing from ...
- 170