# frequency

1. ### How to increase operational frequency to 70MHz in this Colpitts Oscillator?

Hello everyone, I'm building a radio transmitter with a Colpitts oscillator schema and everything works fine. I built the circuit and tested in the Oscilloscope and with L=470uH, C1=100pF, C2=100nF I created a 549KHz 6Vpp senoidal (with 5v as source), as we can see bellow: Theoretically, the...
2. ### FRF resonant frequencies

Hi, I'm new here and relatively new to signal processing and analysis. My ultimate goal is to find the mode shapes of a system, but I'm currently working on building the FRF before I move into the next stage. When computing H=Sxy/Sxx (cross power spectrum over input spectrum), I'm getting a...
3. ### flashing LEDs circuit

Found this simple circuit on youtube and I'd like to know the equation for how to vary R and C to change the flashing frequency. Also, how to increase the current through the led with 3.3 V battery as power source to maximize brightness.
4. ### Active Band Pass Filter - Design Help

Hi all, I was hoping someone might be able to provide some guidance/point me in the right direction for the below problem: The objective is to design an active bandpass with the following parameters: Centre frequency Fc = 100kHz Bandwith fH -fL = 10kHz So far I have the following: Given...
5. ### Remove 10ns jitter from a 1PPS signal from a GPS receiver

Hello everyone, I'm trying to make a very accurate frequency counter. A GPS receiver allows me to have a 1PPS signal that I use as a reference to do my frequency measurement. According to the datasheet this 1PPS has a jitter of 10ns. In short, the more stable this signal, the more accurate my...
6. ### Produce high frequency square wave

Hi readers:), When decreasing R1 value, output frequency will increase. However, I get bad waveform when high frequency. How do I get a good square wave (100kHz) using this LM 741 chip that I bought? Simulation is attached below for your reference and modification to the answer :)
7. ### Change frequency of PCB

Hi, I have some speakers I love, they have a PCB RF reciever inside. I bought more speakers but they are a different frequency.. I'd like to change them so they all match but have no idea what I am doing. Can you help?
8. ### Increase clock frequency

Hi, I’m working on a logisim project for university. I need to increase the clock frequency to 16 Hz, but the frequency must be set in the options to 1 Hz. How can I increase the frequency using only a circuit? Thanks for the help.
9. ### Logisim - clock

Hi, I’m working on a logisim project for university. I need to increase the clock frequency to 8/16 Hz, but the frequency must be set in the options to 1 Hz. How can I increase the frequency using only a circuit? Thanks for the help.
10. ### why in this article baud rate is considered as bit period or bit rate?

I have read this article where I want to save a small question that made questionned my understanding: 1-first question: in this article baude rate/bit period, how can he takes the bit period as the baud rate. in my understanding, bit rate=(1/bit period) = baude rate* number of bits in 1 baud...
11. ### IR infra red frequency convertor

hi everyone, not sure if this is even possible, maybe someone knows of a way. I have a IR blaster that sends at 38kHz and a device that has a 37kHz infra red system. is there a IR convertor \ relay that can make the receiving device (cable set top box) accept the commands of the sending...
12. ### Sine wave generator with variable frequency (1Hz-500kHz)

I thought at first to use a VCO, but I didn't found any that generates a sine wave with 500Khz. So I thought to use a microcontroller, like Atmel o Arduino, but it's really difficult to create a PWM greater than 4MHz. Do you know any other way to generate a sine wave?
13. ### Describe a measurement method for estimating the frequency deviation for frequency modulated signals

Hello, Can anyone please answer this question: Describe a measurement method for estimating the frequency deviation for frequency-modulated signals. Any response would be highly appreciated. Thanks
14. ### VHF oscillator circuit w/ large frequency range and change according to capacitance value

Hello, It's my first post. I'm new in electronics fields. I'm french and my english is not very good, excuse me. I want to make a VHF oscillator(~ 30 MHz) that his frequency can change with the value of the capacitance. I found in an another post the RF2506 which seems to works but it's...
15. ### I am trying to learn one dimensional wave and how to calculate there frequency, speed and direction

So I have been trying to learn how to calculate frequency and speed of a wave. I have this following question which I am not sure how to answer. Can some one talk me through it please.
16. ### Frequency control in a circuit

Hello! My goal is to power an electromagnetic coil. In this circuit I want to use sine waves at a low Hz (below 10 Hz). Im using a signal generator but it does not have enough power for my coil. How can I hook up my signal generator to a AC power supply to regulate the frequency? Or should I try...