Circuit panel

 If you are a student please dont try to make this because 230V is dangerous

Parts:
R1 = 47K
R2 = 100R
R2 = 6.8K
R4 = 68K
R5 = 2.7K-1/2W
R6 = 2.7K-1/2W
R7 = 2.2K
R8 = 39K
C1 = 100uF-25V
C2 = 100uF-25V
C3 = 100uF-25V
C4 = 47nF-63V
C5 = 47nF-63V
D1 = BZX79C18
D2 = BZX79C18
Q1 = BC337
Q2 = BC327
J1 = RCA Jack
IC1 = LM833, Opamp

Notes:

• R2, R3, R4, R7, R8, C4 & C5 should be low tolerance types.
• Schematic shows left channel and power supply.
• For stereo operation R1, R2, R3, R4, R7, R8; J1; C1, C4 & C5 must be doubled.
• Numbers in parentheses show IC1 right channe

R1  100K 1/2W 1% Resistor
R2, R4  10K 1/2W 1% Resistor
R3 1  Meg 1/2W 1% Resistor
C1, C3  0.1uF Ceramic Disc Capacitor
C2  0.01uF Ceramic Disc Capacitor
IC1  4001UBE Quad 2-i/p NOR Gate
Q1  MPSA14 Low Power NPN Transistor
SIREN  Micro piezo siren 12V DC 150mA, 110dB @ 1M
LOOP  See “Notes”

The loop can be any kind of hookup wire, with a most resistance of about 90K. Using very skinny wire (40AWG, for example) will make an awfully sensitive travel wire, but will shorten the distance it will also be strung due to the high resistance.

 The siren can be changed with a relay to power external load

Ultra Fast Battery Chager for Nickel-Cadmium battery cells [NiCad] which will be discussed in this article is Fast NiCad Battery Charger, called the Ultra Fast Charger Battery Charger NiCad because it can make filling fast NiCad Batteries Cell. A battery charger in Desai has a fast charging capabilities such as Ultra Fast Battery Chager for Nickel-Cadmium battery cells [NiCad] on this article shall be equipped with some ability to protect the battery and charger circuit itself.

Feature owned by Ultra Fast Battery Chager for Nickel-Cadmium battery cells [NiCad] 

Image series above is a series of schematic drawings for Ultra Fast Battery Chager for Nickel-Cadmium battery cells [NiCad]. Ultra Fast Battery Chager for Nickel-Cadmium battery cells [NiCad] can be used for 8 to 10 NiCad batteries at once with 12 volt output voltage and max current is 3.5 A. The main components in the circuit of Ultra Fast Battery Chager for Nickel-Cadmium battery cells [NiCad] is UC3843 and MC34181. UC3843 chip is a voltage regulator and M34181 is a JFET OpAmp with characteristic low offset voltage, input impedance is very high. MC34181 serves as a voltage comparator.

This is a design circuit diagram of a light activated switch. This circuit is based on National Semiconductors comparator IC LM 311 and a LDR for operation. This is the figure of the circuit.


The circuit is based on a voltage comparator circuit wired around IC 1. The non-inverting in put of IC1 is given with a reference voltage of 6V using resistors R3 and R4. The input to the inverting input will be the voltage across the LDR that is light dependent. At darkness the resistance of the LDR will be high and so do the voltage across it. At this condition the voltage at the inverting input will be higher than the reference at non inverting pin and the out put of the comparator will be low(~o V). Adjust POT R1 to set the desired light intensity for switching the relay. For this illuminate the LDR with the desire intensity light.

The relay will be either on or off. Adjust POT R1 slowly so that the state of the relay changes. That’s it. Now the circuit is set for the given intensity of light. When the LDR is illuminated, its resistance drops and so do the voltage across it. Now the voltage at inverting input will be lower than that at non inverting input and the out put of the comparator goes high (~12 V). This makes transistor Q1 on and it drives the relay. As a result we get a relay switching according to the intensity of the light falling on the LDR.
You can use either a 12 V battery or a well regulated & filtered 12V DC mains operated power supply. The pin out of LM311 is also given together with the circuit diagram. The pin 5&6 (Balance & Balance/Strobe) of IC LM311 are shorted to minimize the chance of oscillations.

The circuit is directly connected to mains to monitor the status of the connections. Earth connection is a must in domestic wiring to bleed current to the earth if the metal body of a device is accidentally touched with the phase line. This circuit indicates

The circuit gets power supply through C1 and R3. AC Capacitor C1 reduces the high volt AC to a safer level through capacitive reactance. Resistor R3 limits the inrush current and R4 gives discharge path for the stored current in C1 when the circuit is unplugged. Zener diode ZD regulates the voltage to a safer level to protect T1 when it is off. Voltage across ZD will be a square wave by the working of C1 and the voltage level depends on the breakdown value of zener (9 volts). When a potential of 230 volt is present between the phase and neutral lines, T1 turns on during the negative half cycle of AC and Green LED lights indicating that Earth connection is intact. This is because the base of T1 will be biased by the potential difference between the phase line and earth. If the earth connection is not intact, T1 will not get base bias and it remains off. Red LED lights during the positive half cycle of AC due to the potential difference between the phase and neutral lines. Enclose the circuit in a 3 pin plug and connect points A, B and C to the phase, neutral and earth pins respectively. Plug it into the 3 pin socket to test the wiring.

Here I have design a touch sensitive circuit diagram.For this circuit I have used a common transistor BC 547.Normally this circuit can be operated with 4.5 to 6 v.I suppose you will be able to do lots of things with this.I have used this circuit for my room light.So you also can use this circuit for your room light.





Note

# Use a pcb to build this circuit

# Dont supply more than 6V

If you want to send video and audio signals are spread to multiple televisions simultaneously.
You may use a Video amplifier splitter by transistor BD137-BC547-BC557 circuits.
But it is limited. The need for wiring and is only about 4 set only.

Let’s try this circuit is DIY The wireless video & audio signal
sender. Can be used with a television receiver is not limited. And
wireless systems. Distance is about 40 feet. And important this circuit
small device. So is not difficult to create.
The working principle
??Block diagram of wireless audio video sender consists of as follows.
1.
A main frequency generator acts to produced the signal carrier of the
television signal. And is the main frequency of this project.
2. A
signal amplifier will amplify signal come from the frequency generator
circuit to up enough to can drive a power amplifier circuit.
3. A
frequency generator in VCO form, will produce a center frequency 5.5
MHz. Which this frequency will change by a input signal, contributes
to the FM modulated by a television signal system.
4. This power
amplifiers in addition to the high-power amplifier is the last time
before it was broadcast. Also acts as a modulated video signal and
audio. (Through the FM modulation) mixes with Signal carrier frequency
of the video signal in the AM as well.


The wireless audio video sender circuit is shown in figure 1. The
main frequency generator circuit in form of LC in a ground-base
configure type. By has L1 and trimmer C4(3-12pF) together to into a
tuning circuit at output.

For adjust the video signal
carrier frequency as you need in range of 450MHz-550MHz. The R1, R2, R3
are a bias circuits to Q1(C1674). By has C1 cut a high frequency at
pin base. Both capacitors C2 and C3 are connected as divider circuit
to determine rate of signal that feed back from collector to emitter.
The C3 so is not the bypass signal capacitor as general case.
This
frequency is send to amplify up by through coupling capacitor C5 to
transistor Q2(C1674) that is the signal amplifier circuit, The
resistors R4,R5,R6 are set to the bias circuit to Q2, a capacitor C6 is
capacitor bypass frequency to the ground, to protect the loss of power
at the R6.
The inductor L2 send the DC voltage to Q2 At the same
time, it was a RF Shock, prevent visual Signal carrier frequency,
output to supply it.
Since we want to have a frequency stability
over power. We make regulation the power supply circuit to this the
second input sector. With zener diode ZD1 by has value R9 is limit
current and filter to smooth with two capacitors C8 and C9, The signal
is amplified through the link on the capacitor C7 ,to Q4 that is power
amplifier circuit and AM modulation circuit with the same time, by
will be reduce by the resistor R8 to the appropriate size for the audio
signal to pass through the base pin of Q4. The same R7 and R8 are the
bias resistors to Q4 . The inductor L3 act same as L2 and because this
sector we want the best power than others , The power supply for this
,so come direct from the main power supply. By have capacitors C10,C11
and C23 are filter current for the signal that is modulated with the
video carrier wave, ready with the sound signal in AM form that will be
coupling and adjust the amplitude of signal suitably with C13,C14,C15
and R10, by has the VR1 is used to adjust percentage of modulation. The
audio signal will be coupling through C14 and C17 go to the Q3, by has
VR2 adjust the range frequency deviation
Both R11,R12 are the bias
resistors. The C18 is cut off high frequency on pin base. C19 and
C20 are the divider capacitors as same C2,C3, that is set as the
generator circuit on LC ground, base and configure same with Q1. But
the circuit is determined as VCO(voltage control oscillator) to
modulated the audio signal that into the FM input, by Center frequency
of 5.5MHz, which is the frequency difference between the Signal carrier
frequency video signal with audio carrier signal. The set of values of
T1 and C21.
The audio signals through the FM modulation through T1
and C12 are the coupling pin to the base of Q4. The power supply that
entered to this section will be regulaed as 5 volts by zener diode
ZD2, has R3 is limiter current and filter to smoothed do not the high
frequency within by C22. The television signal is completed form outout
of Q4 will be sened Will be spread broadcast antenna, the capacitors
C24 and C25 act as the matching circuits. For the status of the device
is indicated by LED1, with limit current by R14.

The series of police sirens with 555 ic this is a series of sirens that utilizes two IC 555 as a pulse generator and producing shrill voice. 

Both ic 555 respectively build the astable multivibrator circuit and generate output signals with different frequencies. It is intended to be used as one of the high frequency generator or a screeching sound and the other as a regulator of the swing from last shrill voice. If we observe the working principle of this circuit is very similar to a series of modulation fm. Where the shrill sound signal likened to a high frequency signal from the oscillator circuit and control signal swing is the wail of the information signal or input signals that will transmit. This is consistent with the shape of the output signal associated with the loudspeaker, which has an output signal frequency changes in the form of regular meetings wave tenuous.

Actually a series of sirens could be simpler than if you use a 556 IC which is a dual multivibrator or equal to two pieces of IC 555. IC 556 has two multivibrator circuit menfaatkan so you can meet the workflow of this siren sound-producing circuit. Or you can also make it by using a combination of multiple transistors. And it could be you do remember the oscillator circuit can be easily made with transistors.

Appropriate image above then:

R1, R2, and C1 is a determinant of the frequency of the signal generated by IC1

R3, R4 and C3 is a determinant of the signal frequency whine

Signals generated by IC1 IC2 pin 5 connected to the control signals intended for the resulting shrieks

Screeching sound signal will swing to follow the control of the output signal IC1

You can do experiments in order to gain more understanding of police sirens this circuit by changing the value of some critical components such as the frequency of R1, R2, R3, R4, C1 and C3.