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I should have mentioned that the pot is set up as a voltage divider. max resistance has the pot at ground, thus infinite dB reduction.
Also, it's an audio taper pot.
I mapped out my fader using the formula I posted and the hash marks "look" right so I'm hoping for the best...
Hi Everyone,
I am making a front panel for a mixer and I need to know where to put the dB hash marks. I have a fader and an ohmmeter but I don't have a easily accessible audio circuit, nor do I have an accurate dB meter on hand.
How do I calculate the resistance corresponding to each 5 dB of...
The signal is an industry standard, I'm not generating it.
Can anyone answer my actual question? The AC-coupled signal swings on either side of zero. How does the circuit know where zero volts is?
This signal is Manchester encoded and is explicitly intended to pass through pro audio gear, which is all AC coupled. The same question applies equally to sine waves or audio signals.
I know that the capacitor doesn't "know" (it can't) but somehow the circuit as a whole does. I'm assuming...
Hi Everyone,
A DC blocking capacitor removes any DC offset from an input signal. I've been doing this for years without thinking about it.
My question is, how does it know what the local ground potential is?
My only thought on this is that the output side of the cap is just pushing...
Re: My first post: Need explanation regarding diodes to redu
Hi, don't know if you're still checking this thread but here goes anyway.
You blew up your DMM with that circuit if you were trying to measure current. It was a direct short through the DMM and lots of current flowed. If it was...
Re: Need help with circuit
I recommend not trying this. If your house burns down, insurance companies will be crawling all over looking for code violations, weird wiring, anything to avoid paying out. It just not worth it.
One cool thing you could do: Get a 1/2" lucite rod from...
Re: Suggest RTC
I am using an ST Micoelectronics M41T82SM6F in a new design, and it looks like a nice device. Check the rest of their range for chips that suit your interface requirements.
I refuse to use any Dallas Semiconductor chips anymore. Ever since they were bought by Maxim, they...
Re: My first post: Need explanation regarding diodes to redu
If you go back to the old "water pipes" analogy for electricity, then voltage is pressure and current is flow rate. You can have closed spigot with, say 60 PSI in the pipe, but no flow. If you open the spigot a little, some water...
I haven't built the board yet; I want to make sure that it works when I do. Yes, I could definitely use some "supervisoring".
Regarding the +/- on the relay, it is a panasonic TN2-12V, and there is a permanent magnet used on the inside, which requires correct polarization of the coil. There...
Re: My first post: Need explanation regarding diodes to redu
Don't worry too much about how a diode works. Just take it on faith that it drops from .2V to .8V, depending on the type of diode.
The actual answer is very complicated and involves the physics of semiconductors. I'm not just...
Hello everyone,
I've got to put a 12V relay on my new board, driven from a 3.3V logic output. Could you please take a look a my circuit and confirm that I've done it right?
Q1 is a 2N3904, used because I'm slightly familiar with it. I know that Hfe is an unreliable number, but it seems...
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