| Electronics > Beginners |
| my analog switch doesn't work as intended |
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| mheruian:
--- Quote from: sarahMCML on November 19, 2018, 01:04:38 am ---Hi mheruian, I have a circuit that may cure your problem: unfortunately try as I might I cannot seem to get the hang of inserting graphics or photos on this forum, else I'd send the JPEG. Regards, Sarah. --- End quote --- Hi Sarah :D thank you so much for the response. That's great :D is it +/- 5 volt oriented switches for analog signal also? Uhm, yeah, jpeg would do because png are quite big in size, i had that problem also and i end up saving them as jpeg and lowering the image size. A while ago, a man from fb forum told me that i should expect an output voltage of lesser 0mV when analog switch is off instead of 7mV to 12mV but he didn't told me how can I achieve it. |
| sarahMCML:
Hi once again, The problem is: how do I insert or attach my image file? I can't get them to work! Frustrated, Sarah. |
| mheruian:
Hi sarah :D Sorry if I was unable to answer that. If you can see the images on my post, below is the image on how you can attach picture/files. |
| sarahMCML:
Hi, Here is the little circuit that might suit. It has been used before to remove the leakthrough of unwanted signal in cmos analog switches. It relies on you having not used at least 2 of the other sections in the 74HCT4316 chip. Section D of the circuit is used as an inverter, controlling sections B and C, both of which are wired in parallel. When your On/Off control signal switches your main output off by going low, section D's output goes high impedance, and the 4K7 resistor pulls the S inputs of sections B and C high, turning them on. This makes them both short the output of section A to GND through a very low impedance and should give you a clean output. I haven't shown the rest of the connections as you already have those! You haven't disclosed whether you have any other purpose to your circuitry, so this may suit you. I hope that the diagram comes out large enough to see; if not I'll enlarge it and resend. Regards, Sarah. |
| T3sl4co1l:
That's about as close to zero as you're going to measure in that environment. High frequency noise looks like... PFC converter, maybe? Seems unlikely it's in the bench PSU, but maybe the overhead lamp, or a cheap laptop / tablet / phone adapter/charger out of view? Basically, that noise goes away when you replace the offending unit with one that actually complies with FCC or CE regulations. :palm: Tim |
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