Questions tagged [passive]

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68 views

2 Ethernet jacks on a Device with ENC28J60 chip in with switch

Have a ethernet device that works with Microchips ENC28J60 chip perfectly. So if I want to connect a cable from a switch/controller, to device 1 (that has 2 RJ45 jacks), then have device 1 second port ...
1
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1answer
43 views

2 channel audio splitter passive

I have a Scarlett solo like the one above and I need a way to split the output of the Mix boards Auxiliary output into two level controlled signals. This Scarlett puts the Instrument on the left ...
0
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1answer
70 views

sudden current dropping identifying circuit [closed]

Here is my scenario: I have a pair of electrodes in my device and it is submerged in seawater, so there is a current. Once I take it out the current drops and I want to implement a circuit to identify ...
1
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2answers
82 views

Need help on building a passive Dim-to-Warm LED array

I have started a project for my home lighting, I'm trying to build a DC LED module which would change the color temperature from 3000K to 1800K as dimmed with reducing current. I'd like to do it ...
0
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0answers
35 views

Which passive filter corresponds to this transfer function?

We've have been asked to find a passive circuit for the following function: With these coefficient values: Then, we've converted it to Laplace domain, so we have: Next, we should look for a filter ...
0
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2answers
58 views

Unpowered clock divider

I am not a professional in this area, so I hope I am asking questions correctly. I have a 5V clock pulse with 50-200Hz (square wave) and would like to build a simple unpowered clock divider. Output ...
3
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2answers
4k views

VGA to composite circuit. Does it work?

So I found a VGA to composite passive converter circuit online, and was wondering if it would work, if the vga timings were modified to match the timing of composite. Here is a relevant schematic:
2
votes
1answer
754 views

Understanding + modelling passive filter (crossover) circuits: Component position and effect

I'm trying to learn more about how passive filters work by modelling a speaker crossover (using Qucs), and as a starting point I'm using a crossover from a speaker I've built as an example, since I'm ...
0
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2answers
962 views

20 Hz subsonic 350 W RC low pass filter

I build rotary subwoofers that produce ULF (subsonic) sound levels (youtube) . The amplifier that I use is 12V 350W and supplies up to 25 amps. I would like to create a reasonably high quality, ...
1
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0answers
147 views

What is the official name of this item?

I have purchased this item locally in the past and basically its 5 wires aligned in parallel, and makes my circuitry much easier (eliminates the needs to manually connect 5 individual wires side-by-...
1
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2answers
936 views

Very low frequency Passive High Pass filter. Capacitor type

I want to design a passive high pass filter to remove a voltage offset with a cut-off frequency of 0.1Hz. A simple RC filter would include the values of R = 159k and C = 10uF. I want to avoid using a ...
3
votes
1answer
595 views

How can I tell if I can power NFC chip passively?

I'm trying to figure out how to tell if I can power a particular NFC chip/microcontroller passively. By passive I mean it needs no battery and can be powered by an NFC reader alone. Many ...
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1answer
73 views

discrete high order filter (passive?) [closed]

Well, not completely passive. But not what's usually meant when one uses the words 'active filter'. It's going to be a filter that consists only of discrete transistors, capacitors and resistors. ...
0
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1answer
134 views

Can anybody tell me why the amplitude goes down by half?

Can anybody tell me what I need to do to this circuit to keep the gain at 0dB until 23kHz to 25kHz? The gain goes to -6dB. I want the gain to remain at 0dB until it's 23kHz to 25kHz, that's when I ...
0
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1answer
500 views

LC Filter Attenuation

Hi I built a simple LC low pass filter and I supply it with a 1 volt peak to peak ac voltage at 200 Hz from a function generator. My cutoff is set at 700 Hz and I have selected my circuit components ...
0
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2answers
478 views

Can I connect RFID tag to a microprocessor?

Is it possible to connect an passive RFID tag to a microprocessor and functions as a receiver? I am new in this,so I need abit of advice on how to do. I've heard alot that it is possible but there is ...
0
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1answer
653 views

How can I find or build a passive RFID tag with a range of 6ft, as well as an associated reader?

I am looking to implement a RFID system that uses trilateration to localize a RFID tag. I have no experience with RFID, and although I have done some basic research, I have no idea where to begin. ...
0
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1answer
292 views

Multi Stage Passive Filter Design [closed]

I'm playing around with some simple RF beacons, many of these use a multi stage LC ladder to filter the outgoing signal after passing through a class C amp. Can anyone point me to a good reference/...