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i think the problem is in the hardware connection if all your displays are displaying the same number.
it seems you connected them in parallel.
their are two ways for connecting multy seven segments to ucontroller
the first way is mutiplexing them but it's hard to start with as a biginner but it...
what microcontroller r u using?
but ant way it's easy, said you arrived to a point where it recognizes the key stroked.
store the value before displaying it.
when anther key is stroked you display the already stored value to next seven segment and the new value to the first display.
you will...
Re: high frequency receiver - help needed
I'm saying you can because i tried it and it works.
not a good choice of course, it works very poor but it does work.
i captured the audio of a vhf tv station here in lebanon.
about the gsm of course it won't work, even if you make a gsm band receiver...
Re: high frequency receiver
try to make your own receiver, their is a very powerfull ic called tda7000 it is full superheterodyne fm receiver you only need to add some capacitors and inductors around it, and yes you could catch audio of tv channels but you cannot decode video of course.
need help with layout
hi ken
i have cirtificate in orcad i have studyed the layout or more than a year.
i you want to take a pcb design to a pcb house you will have to bring the what is called gerber files.
these files contain all the info of all the layers and footprints, masks,drill........
i...
JFET source Follower
it may be because your j fet is not symetrically biased. and thus your transistor is going to cut of
try to:
1- biasing your transistor symetrically
2- apply smaller voltage at the input
i would choose B if i were since you r talking about amplifier, and in amplifiers you search for maximum symetrical swing to get the largest signal possible at the output, unless you are working with dc only positive supply, then you choose vcm = vdd/2
and about the resistor you were asking it...
dc dc converter design
try to use the charge pumps they are the main dc to dc convrters you can use them to multiply by n.
i used charge pump to make a 30v from 5 volts to power up an opamp.
here is a file that will help you:
**broken link removed**
because am is very old,more than 100 years old.
and you have to choose the IF not to large so you will have acceptable values for filter components and amplifier components. and not too small so you don't have mirrored signals at the mixing stage.
and you have to standartize the value, so 455...
no the impedance decrease. since you are talking about a single wire antenna.it is considered to be monopole.
you could simulate it using the antenna optimizer software.
and about the LC matching circuit yes it is possible as long as you are working in a receiving antenna, cuz in a high power...
it also has an effect on the Q of the RLC citcuit. by definition the Q is the resistance devided by the reactance of the rlc.
so the higher is c higher Q u get for the rlc circuit
one other thing chck the power supply that is feeding the circuit, it may be overloaded so when the circuit oprates it voltage is droping so the uc is operating at low voltage.
try to run the circuit and check the supply voltage while it's running if it is under the recommanded voltage of the uc...
the design is easy in theory thow you have to be carfull working with these things.
the best way to do it is to use pwm (pulse width modulation) since it offers very high efficiency in the circuit, near 90 percent.
what you have to do is to genrate a pwm sine wave. u can do it digitaly using a...
if u r searching to connect then in a certain way and do that it's impossible since the avr uc are designed to read and write from external memory not to be red or writen.
but theoretically it's possible thow not pracicall at all you can do it by software. you write a programe to the slave uc to...
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