Questions tagged [passive]

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2k 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
520 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
votes
2answers
763 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
vote
0answers
129 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
vote
2answers
746 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
564 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 ...
-2
votes
1answer
71 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
votes
1answer
133 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
votes
1answer
389 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
votes
2answers
459 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
votes
1answer
624 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
votes
1answer
264 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/...