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Re: speech processing
You could use a look-up table, but that would not account for variations in tone and amplitude of spoken word, and the variety of inferences these variances imply.
Can you tell me how *you* recognize language? Most voice interface to this point is monotone and very...
fuse blows overvoltage
two feedback modes... overvoltage or overcurrent...
foldback current limiting can have a very fast response to current spikes, overvoltage sensing responds to fast voltage spikes.
Fuses = medium slow and relays are just the slowest switch around
These conditions are not...
12 to 5 circuit
The easiest way to do this is the circuit submitted by eecs4ever above. A very simple voltage divider + voltage follower buffer, it will provide Vo = 5Vin/12.
To be precise, note that you need to use 1% resistors, and the closest standard 1% values are 6.98kΩ and 4.99kΩ...
how to measure audio levels
You can use a log amp to greatly increase the dynamic range capability of the ADC input. The µC would then use a look-up table or linear regression coefficients to calculate and display the level in decibels.
https://en.wikipedia.org/wiki/Log_amplifier
how to drop 12 volts to 5 volts
Clipping typically refers to the distortion of an AC waveform that occurs when the input signal to an amplifier is of too great an amplitude, so it isn't clear what your goal is here.
Is the 5V to be used as a power supply for a subsequent circuit or perhaps an...
tip125 heating regulator
You're welcome, Ron! I definetly agree with Brian; the diode should be wired in series with cathode to voltage regulator input. While placing the diode in parallel with the input will protect the circuit for a brief instant, it will also catastrophically destroy the...
op amp function generator
Look into NTE's NTE864:
https://www.nteinc.com/specs/800to899/pdf/nte864.pdf
It's a functional equivalent to Intersil's discontinued ICL8038.
**broken link removed**
how to use site:edaboard.com
If you are taking a new piece of equipment into production, be aware that Microchip regards the 16F877 as a mature device that is to be superseded by the 16F887:
https://www.microchip.com/wwwproducts/ProductCompare.aspx?product1=PIC16F877&product2=PIC16F887
Going...
Re: choice of a diode?
A couple 1N4001 (50PIV, 1A) diodes is the cheapest solution if your current requirement is less than 1 amp, however the 7805 can briefly output peak currents of 2.2A, so consider the 1N5400 (50PIV, 3A) instead.
Since you're operating a linear regulator, there's no gain in...
air core transformer design
What is happening is you are approaching the natural resonant frequency of the transformer. All coils have some small amount of parasitic capacitance to ground, which forms a resonant tank. If you continue to increase the input frequency, you'll find that the...
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