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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Thanks gophert, I'm using the "touch" sense pins on a Teensy microcontroller and also the arduino CapicitiveSensor library, both I assume are using capacitance not resistance. I did a test when I covered my copper-tape test pads with masking tape (the regular paper kind) and the response dropped...
Hey everyone,
I'm wondering if anyone has had any success doing capacitive touch sensing through a PCB's soldermask. I see that it works well with bare copper pads, but I have an application where I would like the buttons to appear plain white - so was considering hiding them behind a white...
left op-amp is powered by +/-15V right opamp is rail-to-rail and powered by 3.3V/GND. ADC maximum input is 3.3V. I appreciate you trying to simplify my mock schematic by wanting to remove resistors, but just assume they're there for a reason.
Yeah sorry, I just quickly drew that up just to show locations of the op-amps and basic setup. I didn't think that the type of op-amps or their power connections had anything to do with best practice for where an output resistor should go between op-amp stages.
I tried to keep the problem simple for sake of the forum post. The more detailed answer is that the second op-amp stage is being used as a clamp/voltage-limiter before an ADC input to protect it from any possible over-voltage - it is a rail-to-rail opamp powered by a VDD of the maximum input...
Hey everyone,
I'm looking at prototyping a few things and need some very specific dimensioned Neodymium magnets. I'm looking at cylinders that are 2, 2.5, 3, 4mm in diameter and lengths of 15,20mm. I've found all of these magnets on aliexpress for cheap, but the shipping times are approximately...
Hey guys,
I'm very familiar with using bench power supplies and breadboards to prototype regular analog circuits. But I'm wondering, what do people do to typically prototype vacuum tube circuits? Say 20W amplifiers and oscillators, etc?
Do you just take a chassis and punch holes for all the...
Hey guys,
I was having problems with a circuit oscillating today. I've posted the relevant part of the schematic.
First of all, forgive me if this thing is a mess. This is a circuit board that has gone through a few changes by a few different people. Basically, there is a sensor (P12) at the...
I actually supported the kickstarter, because I'm interested in a music player that isn't locked down by Apple to use software and proprietary connectors. I'm skeptical of the sound quality, but willing to test it with an open mind. Maybe I'll post the results and some tear-down photos when I...
Hey guys,
I'm revising a circuit board design to be manufactured, and this time I'd like to include oval holes. I've never used them before, and want to use them because they would save space compared to a regular circular hole. The application is for a zip-tie to pass through the circuit board...
I wanted to see the actual voltage output of the circuit across the frequencies. AC Analysis showed voltages as high as 110V, but I suppose I could just assume that any voltage shown over my power supply voltage would just result in clipping.
Thanks for that, things look normal now.
Is there any way to do what I was achieving? That is, see the frequency response of my circuit in actual Volts? Like, have the source frequency sweep during the transient analysis?
Hey all,
I'm simulating a really simple circuit (op-amp driving two transistors in a push-pull configuration). When I do an AC Analysis and compare the input and output, the input looks great (10Vpp signal as I set) but the output shows a voltage going to nearly 110V!
Maybe I'm doing something...
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