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Choice of two problems:- 1 there is a wiring fault, 2 bad layout or decoupling causing high frequency oscillations. So if you have a scope put it on the output see if you can see any wave form with no input. If its oscillating then the wave form is normally huge like+- Vcc p-p. in this case the...
If you can align them end to end with the turns in the same direction then you will get additional mutual inductance, This is not weird, its free inductance!
Frank
You can calculate the frequency stability, but its meaning less as the rest of the circuit will be less stable then the crystal. Unless you actually build your clock or have a rubidium controlled counter, its difficult even to measure the accuracy. Unless you are just using it as a basis for...
I have found that the small DC fans with their internal IC drivers require a very low impedance source for them to work. From this I would guess that at the end of commutation, the driver IC will return the fan's stored back emf into the main supply line. Saves the power having to be...
Its late at night but have you not done a (8 -3.6) followed by another -3.6, which I think is close to (8-7.2?). So why not 8 - 2 X 3.6?
Oscillator frequency is ever so importent with respect to IF images and "birdies" (fixed hetrodynes within the pass band). The whole IF/Osc. systems are...
Re: What is meant by cavity backed antennas,what is the need for it .
A cavity is just a tuned circuit. Its main advantage is that you you a very wide choice of frequency responses and impedances to play with. It should be made from copper or some other low resistance material, otherwise its...
Re: What is best antenna for these RF remote modules
First off all deepest apologies to OP, range varies as aerial size. Despite trying to loggon for days to correct my stupid typo, Browser + site + Google Chrome have stopped me. Removing Chrome has opened the site up again. Is not software...
A current source has an internal impedance much higher then the external load . Opposite to a convention voltage source. So a 1mA current generator might have an output impedance of 1M ohm to drive a 1mA into a 1K load. The ratio of the internal impedence and load, will give you a "goodness"...
Re: What is best antenna for these RF remote modules
Having fiddled about with these sort of things for years, the basic expression is range varies as the reciprocal of size. The smallest I might have seen would be 100mm long time 3mm diam coil- range 20 m. Size 2m wide times 4m long (flat...
With 3.3V from your micro on the base the emitter can only be 3.3+- .8 or so, i.e. 2.5 or 4.1V or you will destroy the transistor.
If you want your emitter to switch , say +12V/0V then the first stage is to amplify the 3.3V. When its delivering current the output voltage will be less then 12V...
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