The frequency-measurement tag has no wiki summary.
1
vote
1answer
35 views
555 timer monostable time constants [duplicate]
When making an monostable circuit with a 555 timber, the time that pin 3 is on is calculated using this:
time on = 1.1 x R1 x C1
My question is why is 1.1 included.
1
vote
1answer
37 views
555 timer astable time constants
When making an astable circuit with a 555 timber, the frequency of pin 3s pulse is calculated using this:
f = 1.44 / (R1 + 2R2) x C
My question is why is 1.44 included.
-1
votes
0answers
49 views
with 13hz, how to get values for resistors and capacitors on a ttl digital clock design
I got a TTL based digital clock from some source on line. just by typing "TTL BASED DIGITAL CLOCK" at Google you can find the link there of the schematic in PDF format. Our project is to create a ...
2
votes
1answer
121 views
AVR Measuring frequency using external interrupt - where are my cycles going?
I'm using an external interrupt to measure the frequency of a signal, the AVR clock is at 8MHz. I'm essentially counting the ticks between pin toggles using a 16 bit timer (with some handling for ...
0
votes
2answers
199 views
Frequency measurement with STM32
This question is mainly a query for an advice.
I am trying to implement a frequency meter on STM32F4.
Up to this point I have a working ADC converter with DMA and a timer which checks for the current ...
2
votes
2answers
71 views
How can I improve my Freq to Voltage circuit?
I had a term project which was based around Analog-to-Digital convertors.
We used anLM2907 Freq-toVoltage convertor to take a 150mVpp sine wave (0- 1kHz) and convert that to a voltage. The voltage ...
1
vote
1answer
203 views
Estimating a sinc period and width of a rectangular pulse
For a rectangular pulse that has as a fourier transform of a sinc function like so:
How can I estimate its sinc period in the frequency domain and compute the width of the rectangular pulse in the ...
2
votes
1answer
239 views
counter giving erratic results for frequency measurement using Atmega32
I am using a photosensor which gives output as a square wave. The frequency of this square wave is being measured using Atmega32A with 1MHz clock. The full scale output of sensor is 500kHz.
The ...
1
vote
0answers
120 views
power supply frequency response
I have a question regarding the frequency response of a boost converter. I am curious to know what causes the "blip" at around 8kHz that causes the response to go up and then back down. At first, I ...
3
votes
1answer
204 views
output filters for power supply design
I am trying to develop a design for a power supply design. At the output of my design is a diode rectifier with capacitive filter output. I've been told that I should expect to see an ESR zero or ...
4
votes
2answers
991 views
Problem with a Relaxation Oscillator (using Op Amp)
I'm studying a relaxation oscillator. This wikipedia circuit shows exactly my circuit with the only difference that I'm using different values for each resistor.
I called resistor R the one ...
2
votes
1answer
170 views
Analog Telephone Frequency Response Curve
Old analog telephone circuits using carbon microphones seem to be said to have a frequency response of, from various low frequencies which differing reports put at between 275 Hz and 400 Hz, up to ...
6
votes
1answer
1k views
How to measure pulse width of an IR signal using an 8-bit PIC?
My friend and I want to design a universal learning remote controller, like this one, for learning purposes. What we want to do basically is store and replay infrared pulses.
We want to detect 36kHz, ...
0
votes
2answers
116 views
Testing Oscillator Over Temperature
I want to characterize the frequency inaccuracy of several silicon oscillators over temperature to see which one will work best in my end application. If I populate the oscillator on a bare-board and ...
0
votes
1answer
514 views
Frequency to voltage converters [closed]
I'm looking for a frequency to voltage converter IC that can operate with an input frequency of around 500 kHz. The device does not have to be high-precision and the operating voltage can be anything. ...
