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### Choosing isolation resistor for Op-amp output

I want to choose an accurate value for an isolation resistor for my OP-AMP (OPA838). Based on the datasheet, the OPA838 is very sensitive to capacitive loads and needs an isolation resistor added to ...
• 473
86 views

### Why is there a shift in cutoff frequencies of filters, and how to fix it?

I am doing a project where I am designing my own EEG circuit. I aim to keep it fairly simple and essentially design my circuit to do two things: Amplification Filtering I want to design the circuit (...
1 vote
211 views

How can I describe the loading effect in an ohmmeter? I've been given an assignment with this question, and I tried to look it up on the internet but could find no other material apart from loading ...
1 vote
77 views

### Measurement of resistance of the Earth

From "Learning the Art of Electronics" by T. Hayes and P. Horowitz (Cambridge University Press, 2016): If we attempt to use a digital multimeter to measure the resistance between A and B, ...
• 105
194 views

### Why is the frequency response from my 1X and 10X probe seem to be converging with increasing frequency?

I'm a Mechanical Engineer trying to get into electronics so please excuse my lack of understanding. I'm feeding a 5.0 Vpp sine wave into my SDS 1202X-E scope from my signal generator (see image below)....
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I have the following circuit, with an electret microphone and a TL082 op-amp: I was asked to calculate the load effect of the amplifier. However, I don't understand: I thought that the whole point of ...
• 153
1k views

### How to know if an opamp can drive capacitive loads?

There has been a lot of questions about how to stablise opamp circuits driving capacitive loads. However, I know there are some op amps that are designed to drive capacitive loads but I am struggling ...
• 113
147 views

### How can I eliminate the paralleling effect of ADC input impedance at the output of sensor sense resistor?

I am using a sensor that gives 5V output However, the ADC I am using can sense only a 3.3V at absolute maximum. A very simple way of translating a 5V to 3.3V was to use a voltage divider as shown. ...
1 vote
288 views

### Does the burden resistance at the output of a current sensor (either Hall effect or current) represent the output impedance of the sensor?

I need to measure current though a sensor and feed it to the ADC of a micro-controller. The ADC input voltage range does not match the sensor's output voltage range. I searched and found that op-amps ...
86 views

### How to reduce loading of JTAG lines by USB UART bridge using shared signals

I have a USB to TTL (UART bridge) that is connected permanently to a custom board with an ARM MCU. The UART lines are shared with the JTAG programming lines. The problem is that even without any ...
• 435
1 vote
293 views

### Stick-Slip Piezo Linear Stage Driver - Prevent the Load from Changing Driver Output?

I am currently trying to develop a circuit that generates ramp waveforms to control the motion of a piezo linear stage. Specifically, two waveforms need to be possible to output: a slow ~250us upward ...
• 89
74 views

### Fan speed slows down, the moment a new load is added

I am using a rectifier, and 4500uF capacitor to reduce the ripple. After connecting to the power source (60Hz, 120V), I was able to turn on the fan. The issue occurs when I turn the switch on to power ...
• 195
278 views

So I calculated the Highpass stage output impedance to be 22kohm and the input impedance of the Lowpass stage is 430kohm when f=5khz, still in the output I am getting half of my supply voltage despite ...
2k views

I'm reading "The Art of Electronics" (3rd edition) by Paul Horowitz and Winfield Hill. In the 2nd chapter on BJT (page No. 79, section Emitter follower). The author says: ".. In general, the ...
2k views

### Capacitance Measurement With Oscilloscope

simulate this circuit – Schematic created using CircuitLab I'm trying to determine the capacitance of a sensor, but the oscilloscope's internal capacitance is loading the measurement too much. ...
• 81
1 vote
12k views

### Converting PWM to analog voltage

I need to convert a PWM signal with varying duty cycle from the arduino to an analog voltage from 0-5V. I used a RC filter with a time period of 3.9ms. The PWM output has a period of 2ms. I ...
1 vote
1k views

### Question regarding operation of a pulse generator circuit with 3 transistors (exercise 2.3 art of electronics)

The exercise 2.3 in 3rd ed. of Art of Electronics asks: what is the output voltage during the pulse? I've replicated the circuit diagram from the book below (in circuitlab.com). I'd be grateful if ...
• 11
285 views

### Audio - How does I/O impedance affect the device?

Last year I was experimenting with a design for an audio distortion to be used on line level musical instruments (+4dBu with Zout 100-600Ω by my findings) without the knowledge of impedance, its ...
• 359
509 views

### Can I "duplicate" a stereo signal to 5 channels? Are there any impedance issues?

A friend of mine has an old 5.1 audio system. The amplifier of the system has 5 cables as inputs to be connected to the audio source. My friend actually uses some cable splitters to send the stereo ...
• 623
2k views

I could not understand why is adding 'Rlin' in the second figure improves the linearity of the system? A little help pls!