VOLTAGE DOUBLER A voltage higher than the supply can be created by a "Charge-Pump" circuit created with a 555, diodes and capacitors as shown in the following circuit. The output will deliver about 50mA

This circuit will adjust the brightness of one or more LEDs from 5% to 95%.

charged. If the leakage of the electro is 1 microamp, it will never fully charge and allow the 555 to "time-out." 7.

These three circuits flash the left LEDs 3 times then the right LEDs 3 times, then repeats. The
only difference is the choice of chips.

This circuit drives a 3x3x3 cube consisting of 27 white LEDs. The 4020 IC is a
14 stage binary counter and we have used 9 outputs. Each output drives 3
white LEDs in series and we have omitted a dropper resistor as the chip can
only deliver a maximum of 15mA per output. The 4020 produces 512 different
patterns before the sequence repeats and you have to build the project to see
the effects it produces on the 3D cube.

This circuit confuses the infra-red receiver in a TV. It produces a
constant signal that interferes with the signal from a remote
control and prevents the TV detecting a channel-change or any
other command. This allows you to watch your own program
without anyone changing the channel !! The circuit is adjusted to
produce a 38kHz signal. The IR diode is called an Infra-red
transmitting Diode or IR emitter diode to distinguish it from a
receiving diode, called an IR receiver or IR receiving diode. (A
Photo diode is a receiving diode). There are so many IR emitters
that we cannot put a generic number on the circuit to represent
the type of diode. Some types include: CY85G, LD271,
CQY37N(45¢), INF3850, INF3880, INF3940 (30¢). The current
through the IR LED is limited to 100mA by the inclusion of the two
1N4148 diodes, as these form a constant-current arrangement
when combined with the transistor and 5R6 resistor.

The 555 is capable of sinking and sourcing up to 200mA, but it gets very hot when
doing this on a 12v supply.
The following circuit shows the maximum number of white LEDs that can be
realistically driven from a 555 and we have limited the total current to about 130mA as
each LED is designed to pass about 17mA to 22mA maximum. A white LED drops a
characteristic 3.2v to 3.6v and this means only 3 LEDs can be placed in series.

This circuit produces traffic lights for a "4-way" intersection. The seemingly complex
wiring to illuminate the lights is shown to be very simple.

This is a game for two players.
Player 1 presses the START button. This resets the 4026 counter chip and starts the
555 oscillator.
The 555 produces 10 pulses per second and these are counted by the 4026 chip and
displayed on the 7-Segment display.
The second player is required to press the STOP button. This freezes the display by
activating the Clock Inhibit line of the 4026 (pin 2).
Two time-delay circuits are included. The first activates the 555 by charging a 10u
electrolytic and at the same time delivering a (high) pulse to the 4026 chip to reset it.
The second timer freezes the count on the display (by raising the voltage on pin 2) so
it can be read

This circuit produces 10 different tones and by selecting suitable values to change the
voltage on pin 5, the result can be quite pleasing. Note: the two unused outputs of the
4017 produce a tone equal to that produced by the 555 when pin 5 has no external
control voltage

The 555 will activate a relay. When pins 2 and 6 are connected as an input, the chip requires only
about 1uA to activate the output. This is equivalent to a gain of about 200,000,000 (200 million)
and represents about 4 stages of amplification via transistors.
In the first circuit, the output will be opposite to the input. The relay can be connected "high" or
"low" as show in the second diagram. One point to note: The input must be higher than 2/3V for
the output to be low and below 1/3V for the output to be high. This is called HYSTERESIS and
prevents any noise on the input creating "relay chatter."
NEGATIVE

This circuit produces a tone above the human
audible range and this is supposed to keep the
mosquitoes away. You need a piezo diaphragm that
will respond to 15kHz and these are very difficult to
find.
to

The output is LOW at start-up due to the capacitor
on pin 4. When the mercury switch closes, the
output goes HIGH and remains HIGH until the
reset button is pressed. This circuit is called a
LATCH. See Latch circuit and Memory Cell above

هر کس اینجا عضو شده از طریق آخرین مطالب نقشه ها رو ببینید.

ممنون

This is the circuit for Dr. Hulda Clark's Zapper, designed in 2003. The frequency is
approximately 30kHz positive offset square wave. It has a red LED light that lights up when
the unit is on. Perfect for regular zapping, extended zapping and other Hulda Clark related
experiments.
This device is used to cure, treat and prevent any disease. It will cure anything. Simply hold the
two probes (one in each hand) for 5-10 minutes then rest for 20 minutes, then repeat two
more times. Do this each day and you will be cured. Here is the .pdf of her book: A Cure
For All Diseases. Website: http://clarktestimonials.com/ Hundreds of people have been
cured of everything from herpes to AIDS.
On the other side of the coin is the claim that Dr Hulda Clark is a complete quack. Here is
a website called: Quackwatch. The second diagram shows the two copper tubes and the
circuit in a plastic box. I am still at a loss to see how any energy can transfer from this
quack machine, through the skin (50k skin resistance and 9v supply) and zap a bug in your
intestine. It's a bit like saying I will kill all the mice in a haystack by stabbing the stack with
a needle.

See also: PWM
This controller will deliver up to 30 amps and control the
motor from 5% to 95%.

عضو شوید و از مدارات موجود لذت ببرید.......................

هر مداری که بخواید موجود هست.

این مدار در موقعی که آب به سنسوراش بخوره صدا میده......................

ادامه مطلب..........

اینم نقشه ی یک اینورتور 12به240

برید باهاش حال کنید.............

برای دیدن نقشه به ادامه مطلب مراجعه کنید..

خداوکیلی ازس به درستی استفاده کنید....................