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Re: simple receiver
Some people said that the diode detector need certain power to start up. Let us say that 300mv (peak to peak) is the minimum gate to start the diode detector. Without the high frequency amplifier, We can imagine that how many gain the transmitter(100mw) and receiver...
Re: simple receiver
Hi, flatulent:
I've made a simple design under your solution and after reading some reference.
Q1 is quite hard to selected because it must be up to 3GHz maybe and low power consumption. D1 and D2 is a double schottky diode(HSMS2812) which may have higher efficiency and...
Re: simple receiver
flatulent:
Thanks for your suggestion. I really have no knowledge about RF. Would you please give me a simple schematic design?
HeiFelix
simple receiver
Hi, Members:
I just begin to design a RF product which runs on 433MHz. The transmitter is made by a SAW resonator in ASK mode. The transmitter is normally in sleep mode and need a signal to wake up it. The wake up signal is in 433Mhz lasted for about 10ms(always in "1" level)...
Re: Pulse Counter
Barny451:
Yes, I am trying to detect a change of about 2/16000. The circuit make the frequency quite stable. I've test that with the crystal of 20ppm, The counter seems stable with 1 pulse difference of in 160ms period because the low-to-high transition just cut in or leg out...
Re: Pulse Counter
The Interrupt Service is called for TMR0 interrupt. TMR0 is an 8-bit register and the it may overflow during the 10ms period. The TMR0 and TMR2 are initailized in InitialDetector.
Pulse Counter
I am useing PIC16F87A to detect the frequncy change on RA4 by counting the input pulse of TMR0. The frequency is around 80KHz depending on the sensor and the OSC is 8MHz. In every 160ms, the number of pulses is 0x36B5 or 0x36B6 which means the frequency is stable.
I want to...
Re: RA0-RA3
Hi:
First, thanks all your guys. the fact is that I am copying a interesting product. The diagram of the product is as my description. It does work very well. One end of 4 DIPs are connected to RA0-RA3 seperately and another end of 4 DIPS are connected to ground with an 1K...
Re: RA0-RA3
It is a bad news. I can not do it in your way because I have no place for resisters.
But I really looking at the product which is doing on the way that is described by me before. I really can not understand how it works but it works. I must copy it. Any solution?
Thanks
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