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first check a simple program to blink an LED. If it works the problem is with your LCD connections.
If you are a first time LCD user, try varying the intensity controller potentiometer connected to LCD. hope this helps.
If the method of designing is not insisted, there's a tricky way.
You have 10 states. So make a 10 state simple counter (any counter; states must be unique and descrete; say an incrementing counter). Then convert each state into the outputs you wish by a combinational logic. So circuit become...
Thanks lot. I'm going to implement things as you suggested. But this time I'm not using capacitor, but instead I use 5W wire wound resistor. Because I'm not sure about the frequency. I think the frequency of bridge rectifier output is not exactly 100Hz and expect higher Fourier components...
I've two more doubts about that:
1) I use 230V AC power supply. It is first bridge rectified. So the peak to peak amplitude of o/p will be:
230×sqrt(2)/2≈ 162V
I use 20 green LEDs having 2.1V forward voltage drop @ 25mA. So totla voltage drop across LEDs will be 2.1×20=42V
I design the curcuit...
Re: USB burner
USBtinyISP - Inexpensive USB AVR Programmer
This is one of the most popular free USB programmer fro Atmel devices. Of course it is open source and not much difficult to build your own in your home.
A function y=f(x) is
monotonic- if increasing as x increases
monotonic- if decreasing as x increases
non monotonic - if increasing and decreasing
monotonic - if not increasing or not decresing
For more info: check wikipedia
I think surely. Even in FPGA or CPLD design process we use Mealy or Moore models to design the circuit. One advantage is that, nowadays, most of the complex part of solving Mealy or Moore models are done by a computer software.
Re: LC oscilator type
I think both are Colpitts oscillator. One major difference is in how transistor is biased. One is fixed biased and other one is biased with voltage divider and an emitter resistor for stability over temerature. I think second figure is more standard. In that figure...
Thanks.
I need to use two resistors. One is 200 Ω and other is 5KΩ(variable). Since only the current through these is 25mA, is 1W resistors enough? Also I choose capacitor 10uF/16V. Is there any problem?
I've to use 8 such LED series channels. A 230V supply is first bridge rectified and is used...
Your idea is pretty good. Today, I just looked over my old text books and found one circuit with some differences. It is something like this:
A 200ohm resistor is connected between OUT and GND pin of 7805. LED series is connected to GND pin of 7805 (anode) and ground of the supply (cathode). DC...
Power supply is 230V AC and is rectified using a bridge rectifier. This supply connected to n number of LEDs in series with an LED driver. n may vary from 10 to 40. I need about 25mA constant current through LEDs. Forward voltage of a single LED may vary between 2.1V to 2.8V
I want to connect about 40 or 50 LEDs in series. I think it is better to use an LED driver. Which is the most commonly used LED drivers? Are they available in local electronics shops?
No that's not exactly i want to do. I am building an arbitrary waveform generator and need very fast memory access to ADC. Both my RAM and ADC should work in a few MHz range. A direct microcontroller output is not possible for such speed. Even built in ADC is slow for most low cost...
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