9
votes
How can I measure a 0-3.3V analog signal through an isolation barrier?
Your question is a bit vague, but usually, a problem like yours is solved by pre-processing your analog signal on the "unisolated" side, then using an analog-to-digital converter (ADC) there,...
- 100k
6
votes
How can I measure a 0-3.3V analog signal through an isolation barrier?
The appropriate solution will depend on isolation voltage, CMRR, bandwidth and other requirements . Generally speaking, there are usually two requirements- to get power across the isolation barrier in ...
5
votes
How can I measure a 0-3.3V analog signal through an isolation barrier?
The way I've done this in the past is by using matched opto-couplers to send the signals over isolation. One problem is you get some gain distortion and the matching is something on the order of a few ...
- 88.8k
3
votes
Audio amp split supply VSS/VEE current requirements?
Think of the LM1875 as a big, high-powered op-amp. It has the same input terminals as an op-amp:
+Vcc (op-amp V+)
-Vee (op-amp V-)
In+ (op-amp +)
In- (op-amp -)
Output (op-amp out)
You'll notice ...
- 58.4k
3
votes
How can I measure a 0-3.3V analog signal through an isolation barrier?
Chop it to make AC at a frequency greater then the low pass filter, (eg use a MOSFET H bridge)
Then pass it through a transformer for isolation.
Then envelope detect and low-pass the result.
- 36.4k
3
votes
This is exactly the wrong way to connect this DC circuit breaker, is it not?
Yes, by my reading (assuming current always flows from "input" to "output") that diagram is exactly wrong.
2
votes
Understanding DC versus AC in synthesizers
I assume that "synthesizer" describes something that produces audio waveforms.
While differentiating AC and DC is notionally opinion based, in most cases the descriptions are clear enough. ...
- 152k
2
votes
Accepted
DC power supply
While the actuator might average around 600-800mA, motors and linear actuators often draw a higher inrush current at startup or during load changes (e.g., when reversing or encountering resistance). ...
- 914
2
votes
How can I measure a 0-3.3V analog signal through an isolation barrier?
You can drive optocoupler with PWM. The driving duty will be proportional to output voltage. But it has slow response because PWM needs to be filtered using RC.
Or use MCU to convert duty back to ...
- 2,931
1
vote
Trouble calculating currents in a circuit with Supermesh and dependent voltage source
Why didn't you simplify first? And, more importantly, you didn't state what you were trying to solve. That is needed. Anyway, the simplifications are the shorting out of R6 and R7. The reason you can ...
- 473k
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