Solid State Relays Circuit

Welcome to Free circuit dot com ,today we have classic circuit to implement solid state relay in your electronic project .

Solid state relays are almost everywhere these days, but they are very expensive. So, your efforts to build their own salary. Especially since it’s only a few parts and circuit simple and straightforward. Solid state relay is not really at all relays. There are no “relay” is available only with electronics, connection works. It works well as a relay, you can use low voltage higher and better. “Relay” between 115/220V AC wires in place, although it was customary, the neutral conductor and leave unchanged phases and neutral.

As long as no voltage (left in picture), the phototransistor TIL111 blocks of energy, and thus is not available. To ensure that the base TIL111 is fed to the transmitter (s) through the 1M resistor. This method prevents the base of transistor BC547B will be low and remains biased ‘on’. Collector is low and the gate (g) TIC106M thyristor, which is still in the country, “off”. 4-diode bridge rectifier circuit has no power apart from a small base and collector current BC547B, which is not enough to turn over the 330-ohm resistor TIC226M triac. Current “Load”, is very small.

With an input voltage, say 5 volts, the diode in the TIL111 lights up and activates the phototransistor. The voltage drop 1MEG ohm resistor in series with 22K resistance increases demand, which block the BC547B transistor. Collector current of the fact that the AC voltage falls below a certain value, which is VA. This ensures a sufficiently large voltage drop across the resistor 330 ohms triac switches ‘on’. The voltage on triac is currently only a few volts, so that practically the whole 115/220 AC voltage on the “Upload”.

The triac is a 100nF capacitor and impedance of 47 ohms, 100nF capacitor for the 330 ohm resistor is to protect the triac to be undesirable distortions caused by small peaks. To create the possibility of this circuit with different voltages to be switched, added BF256A FET. The FET acts as a current source from the source (s) with a gate (g). This means that this FET determines the current TIL111, regardless of the input voltage (up to a certain tolerance, of course). 1N4148 diode is to protect the circuit from reverse polarity.
(Tony: TIL111 is a so-called “optical coupling” with NPN output and can be replaced with NTE3042)

Good point line, as is the separation of AC and DC voltage, so this circuit is used in many applications, about 1.5 kW, when the triac is mounted on the large size of the cooling fins.
“M” appears Triac means it’s 600volt type, “D” for 400V. So be sure to go to the M-type.

NTE replacement for this circuit are 600volt types which are more than sufficient for our 110/115VAC. Even if you decide to print for this circuit is enough space between the lines AC and non AC these tracks to be close.

VU 220V Circuit

Welcome back to free circuit dot com, What has circuit today ?

For those who like the sound and light system. Today I get to see the VU lamp 220V circuit.
We may see a small LED in the circuit, but we put a sign of coming out with VU and Opto MOC3021M Triac combined to drive the lamp to light.
This circuit is used OptoCoupler Number MOC3021M NL =11 Pcs.
Triac uses a number BT139-600E 11 + signature print and a electronic device.
The stability and make the budget more than $ 15.

For all electronic device list ,you can look at the number on the PCB and part assembly.

you can bring signal from UV IC or LED signal to connect with Opto

Thus as below show device assembly layout.

VU 220 Lamp Device Lay Out

Increase current for IC regulator circuit

Although the 78xx series of voltage regulators with different power outputs, you can compare the power generation by stimulating this circuitry. A power transistor is used to provide additional power to the load of the regulator, maintaining a constant voltage.

 Currents up to 650mA is flowing through the regulator, begins above this value and the power transistor to run, which provides additional power to the load. This must be a sufficient heat sink, because it is probably pretty hot.

Suppose you use a 12V regulator, 7812th Input must be a few volts higher to allow for voltage drops. Take 20 volts. Let us also assume that the load to draw 5A.

The power dissipation in the transistor Vce * Ic or (20-12) * 8 = 40 Watt.

There you stay warm in the winter, but you will have a large heatsink with good thermal dissipation needs do. Do you want the output current with a negative regulator, such as increasing the 79xx series, then the circuit is similar, but a kind of power NPN transistor is used instead

infrared detector circuit

Welcome again ,Free circuit dot com have the circuit can be used as an infrared beam barrier and a proximity detector.
The circuit uses the very popular Sharp IR module (Vishay module can also be used). NOS pin. circuit is shown in the Sharp and Panasonic modules. For other modules please refer to the relevant datasheets.
The receiver consists of a 555 timer IC working as an oscillator at about 38Khz (also works from 36kHz to 40kHz), which must be configured using the standard 10K. The duty cycle of the IR beam is about 10%. This allows us to more current through the LED, allowing a greater range.
The receiver uses a sharp IR unit. If the IR beam from the transmitter IR drops, the output is activated, which activates the relay and turns off when the beam is blocked. The relay contacts can be used to turn ON / OFF alarm, lights etc. The 10K advance should be adjusted until the receiver detects the IR beam.

The circuit can also be used as a proximity sensor that objects in front of the device detects without obstructing a IR beam. So the LED has the same direction as the IR module and at the same level. The proposed scheme is shown in diagram. The LED should be adequately covered with a reflective material like glass or aluminum plates on the sides to stop the spread of the IR beam to prevent and get a sharp focus the beam.
When there is nothing for them, the IR beam reflected on the unit and therefore the circuit is not activated. When an object comes near the device, the infrared light from the LED reflected from the object on the unit and therefore the circuit is activated.

If there is still a very bad start, use a 1uF or higher capacitor instead of the 0.47uF.

Photo sensor control relay circuit

Welcome back to Free circuit dot com,a good day, We have new circuit for control relay with photo sensor .

A photo or slightly activated relay normally open relay in the closed circuit / contact with the light. In this circuit, a photodiode is used to sense light. The photodiode has a high resistance in the absence of light strikes. The photodiode is connected to the reverse biased state. The only current flowing through it will be due to minority carriers.
When light falls on it, the minority current carriers in the wake of increasing the diode provides a low resistance. Because the voltage across the diode will not be sufficient to bias transistor Q1 and will be reset. Where there is darkness, the resistance increases photodiode and the voltage across it will be enough to move forward bias the transistor Q1 of the relay ON. The diode D2 is used as a diode to protect transistor switching transients produced relay. In this way, the load on the relay contacts can be switched on and off using light strikes the photodiode.

relay control mosfet circuit

We would like ti show you the circuit is similar to the above, but uses an N-channel MOSFET, as IRF511, 540, 640, etc. instead of the NPN transistor.

Smaller MOSFETs can be used, but I do not know the part numbers. I tested the circuit with a IRF640, IRF511, IRFZ34 and REP50N06. The same circuit has three advantages, but requires only a few parts, always off to the relay and do not need a switch debounce.

In operation, when the relay is deactivated, the 100uF capacitor charge up to 6 volts. When the button is pressed, is on the capacitor 6 volts at the gate MOSFET. The capacitor voltage (and gate voltage) of 6 ms should drop to 3 volts in about 200 to move enough time for relay contacts. At very slow relay, a larger capacity.

With the ratification of the relay, the contacts 12 volts to the resistance produce valid 3.3K 6 volts at the gate, holding that the relay is self-sufficient. The capacitor is then discharged to zero since the relay contact 12 is connected not to the 15K resistor.

When the button is pressed, the capacitor is zero volts to the gate of switching off the relay. There should be no problem making the button again to be the operation of relays, since the gate voltage is only about 1.8 volts when the button is pressed and the MOSFET requires approximately 3.5 volts or more are to start running. But you wait about 1 second or more between pressing a key need, capacitor time to load or unload. Two buttons are displayed, but you could have a number of more parallel to operate the relay from multiple locations

automatic turn off relay circuit

Per request the circuit today we have relay circuit.

It is worth noting again that the diagram provides a time delay of about 0.5 seconds for every microfarad in the value of capacitor C1.

This permits delays of up to several minutes. If desired, the delay periods can be made variable by replacing resistor R2 with a fixed and variable resistor in series whose nominal values are approximately equal of the total value of R2 (680K).

Simple RC Circuit

This RC control circuit is a very simple and efficient receiver for operating such as garage doors, starter motors, alarms, alarm systems and many other possibilities.
The BRY35 SCR, which has an extremely low operating current of 30 uA is a typical example – it requires an input power of only 30 uW to activate the relay.
A high Q tuned antenna circuit means for rejecting false signals. A whip or wire antenna is adequate up to 100 meters from a low-power transistor channel.

A switch button resets the circuit with turn On/Off power 12 Vdc.

Pulse Timer Control Relay Circuit

Today we would like to offers solutions for a set time for take control relay and take NO. / NC. contact to apply to control other devices . such as disable or enable the device.

function of this circuit is using IC555 to determine the pulse and a resistor R1 to the period of time.

R1           #Seconds
100k         2
220k         3
470k         6
1M           15

The increase provides more time to increase the value of the Capacitor.

Electronic Part List
R1 = 1 Meg, Preset Pot
R2 = 10K   
R3,R4 = 1K
C1 = 10uF, 16V
C2 = 0.01uF
T1 = BC547 (Gen Purp NPN)
T2 = 2N2222 (Hi Current NPN)
D1 = 1N4001 (Gen Purp Si)
IC1 = 555 (Lo-Power version)
RLA1 = Relay, 9V (amps of your choice)

Capacitor Discharge Ignition circuit

The CDI ignition circuit produces a spark from an ignition coil by discharging a capacitor across the first of the coil.
A 2uF capacitor is charged to regarding 340 volts and also the discharge is controlled by an SCR. A Schmitt trigger oscillator (74C14) and MOSFET (IRF510) are used to drive the low voltage aspect of alittle (120/12 volt) power transformer and a voltage doubler arrangement is employed on the high voltage aspect to extend the capacitor voltage to regarding 340 volts.
an analogous Schmitt trigger oscillator is employed to trigger the SCR regarding four times per second. the ability provide is gated off throughout the discharge time so the SCR can stop conducting and come back to it’s blocking state. The diode connected from the 3904 to pin nine of the 74C14 causes the ability provide oscillator to prevent throughout discharge time.
The circuit attracts solely regarding two hundred milliamps from a twelve volt supply and delivers virtually twice the conventional energy of a standard ignition circuit. High voltage from the coil is regarding 10KV employing a 3/8 in. spark gap at traditional air temperature and pressure.
Spark rate may be increased to probably ten Hertz while not losing abundant spark intensity, however is restricted by the low frequency power transformer and duty cycle of the oscillator. For faster spark rates, the next frequency and lower impedance provide would be needed.
Note that the ignition coil isn’t grounded and presents a shock hazard on all of it’s terminals. Use CAUTION when operating the circuit. An alternate methodology of connecting the coil is to ground the (-) terminal and relocate the capacitor between the cathode of the rectifier diode and also the positive coil terminal. The SCR is then placed between ground and also the +340 volt aspect of the capacitor. This reduces the shock hazard and is that the usual configuration in automotive applications.

Switch Debunce

If you read this, millions of contacts around the world are constantly ticking. Relays, sensors and switches, they are all poor mechanical monster that the first grain to reflect the physical world. Contact whack each other and drag their dance chills to create analog waveforms as unique as snowflakes. No logic of caste without spot these signals, a contact area and hit torturously whoopee for milliseconds before finally settling in a stable state.

   Last month I described an experiment that I conducted evaluated the characteristics of a rebound of a number of switches. The data showed bounce time ranging from fractions of a microsecond to one second. Identical switches have been very different. Some devices conductive elastomer never really turned on by themselves, their outputs radiated a slow ramp from zero to a certain logic. Others behave in a safe way to code we use in our firmware typical debounce routine sharing.

   I bet that this month I thought it would describe the algorithms, which pieces of useful code. Sorry! For debounce is

Switch Debunce 2

one of those activities which lies between the code and hardware. In some cases, a hardware cleaning is the right approach.

This circuit is known as a thermal sensor. In principle, this circuit or NTC thermistor as a sensor. This diagram, where the temperature is almost simple sensor data subsequently amplified by Op-Amp 741, which is then compared with pl P2, etc. served as governor of sushi, then transistor Q1 to move Relay.

heat sensor circuit

Transistor Q1 is a 2N2222 (A) 2N3904, NTE123A, ECG123A, etc. Not all are critical. Only acted as a relay for each type of work, therefore, deconvolution, the length of the energy needed to activate the power coils. D1, 1N4148, acts as a spark arrester on the relay contacts open and abolishs to false trigger. Feel free to use another type of matter, such as 1N4001 or something. Solder directly on the ‘+’ and ‘-’ relay terminals.

Electronic Part List:

IC1 = LM741, LM741CN-ND, LM741CN, NE741, μA741, etc.
Q1 = 2N2222 2N2222 2N3904-ND
D1 = 1N4148
Th1 = 10K
Re1 = 12V relay
R1 = 47K
R2 = 150 – 390K (if ralay “chatters”)
R3 = 1K8,
R4, R5 = 2K2
P1 = 50K Trimmer Pot

Heat Sensor PCB Diagram

How to work
Th1, 50K thermistor is a standard type. I was looking for a bar or rectangular thing. Available from Tandy Radio Shack. Almost every kind will do. I experimented with different models from 22K to 100K, and everything worked fine after replacing the trimmer pot and a small “tuning.

Which was used in the above figure is the circuit model under 50K Fenwal (# 197-503LAG-A01). 50K was measured accurately at 25 ° C and 10% tolerance. Increasing resistance temperature drop. Tolerance for my purposes (cooling power coolrib wide) is 10%.

Heat Sensor Part On PCB Diagram

Another name for this thing is “NTC”. NTC means a negative temperature coefficient “, which means that when the temperature decreases the resistance of the thermistor increases. You might have to buy at the lowest price. Some are thermistor, at least $ 4.00, but for $ 55.00 Canadian dollars for the type of glass encapsulated (the best).
I replaced my 60k thermistor type of glass hermetically sealed, such as the environment, and so my question corrosive particles that may affect future performance include.

BOURNS trimmer P1 is a simple rule, and wide temperature range of this circuit. I used a 10-style in the mood for some fine tuning, but the nature of regular use.

R1 is the “safety” resistor P1 trimmer pot is completely adjusted to “0″ ohm. Just then, the thermistor will receive a full 12 volts, and so hot that it puts blisters on your fingers …
R3 feeds back a bit in the differential op-amp relay to rattle when thermistor temperature reaches remove. Depending on the application and the type used in the 1 Re1 quarter and starts around 330K and reduce its value to the desired result. 150k value reported in the system worked for me. Impairment of hysteresis R2 more resources, but use more than necessary. Or temporary use of the trimmer pot and read the value. 120K worked for me.

Transistor Q1 is a 2N2222 (A) 2N3904, NTE123A, ECG123A, etc. are not critical. Acts as a relay switch in almost every type of work, and could provide the current necessary to activate the relay coil.

D1, 1N4148, acts as a spark arrestor when the relay contacts to open and eliminates false start. For my purposes, 1N4148 is good for the relay I have a little amp. However, you can create a number of diodes used here, my next choice would be regular target 1N4001 or something to be used as a kind of relay connected to the control process more than 1 ampere.

Digagram circuit and PCB layout are current C1, C2, R7 and LED. C1 and C2 are new to the relay switching noise in some applications to remove. Optional LED and resistor was added to the circuit and layot for your convenience. Relays used in this kit is a type of small 12V/0.5A. If the relay clicked increase the feedback resistor R3 to 180km or something “higher, and a small ceramic cap coils connected in parallel with diode D1. Diode 1N4148 is designed for small relay. When using relays as 1N4001 or 1N4004.

If you want to create a custom PCB, try the following. PCB is equipped with holes for the relay, but not your specific relay. It was designed for one type of arene DC12V HB1. Diversity and the relay model is for adults only. How to join? Well, I had a lot of space on the board mount relay. You can also mountain, and connect various cables. Use of silicone adhesives, cyanoacrylate ester (crazy glue) or double-sided tape on his relay place. Works well. Note that the PAC and the imposition Page Not according to the timetable for drawing fans. PCB is about 1.5 x 3 inches (4.8 x 7.6 mm)
If you print inkjet PCBs probably not to scale. Try 8-pin IC socket for mounting on a printed copy to ensure that it matches the scale for printing on a sheet of transparency and PCB …

Touch Activated Light

 Districts among the 20 watt light bulb are touching the contacts and the resistance of the skin is about 2 MB or less. Circle on the left side to use the power MOSFET, which lights up when the voltage between the gate-source and about 6 volts. Gate MOSFET has no current so the voltage on the gate half the supply voltage, or 6 volts when the resistance across the touch contacts equal to a fixed resistance (2 MB) between the source and gate to be.
Circuit on the right uses three bipolar transistors, the same result with a touch contact links at the negative end of the country or bid away.

From the base of a bipolar transistor draws current and current gain is typically less than 200, three transistors to Microamp current level through the touch contacts for a couple of amps needed to increase light. Another stream, can replace the lamp with a 12-volt relay coil and diode.

air flow detector circuit

Parts List

R1  100 Ohm 1/4W Resistor
R2  470 Ohm 1/4W Resistor
R3  10k 1/4W Resistor
R4  100K 1/4W Resistor
R5  1K 1/4W Resistor
C1  47uF Electrolytic Capacitor
U1  78L05 Voltage Regulator
U2  LM339 Op Amp
L1  #47 Incandescent lamp with glass removed (See “Notes”)
D1  LED

Notes:
1. The glass will have to be removed from L1 without breaking the filament. Wrap the glass in masking tape and it in a vise. Slowly crank down until the glass breaks, then remove the bulb and carefully peel back the tape. If the filament has broken, you will need another lamp.

voltage comparator circuit

In the circuit having a voltage quad comparator (LM339) is used as a simple bar graph meter to indicate the state of charge 12-volt lead-acid battery acid. A 5 volt reference voltage is in each of the (+) inputs of four comparators and the (-) inputs are connected, each point is connected to a voltage divider. The LED lights up when the voltage at the negative (-)-input exceeds the reference voltage. Calibration can be by adjusting the 2K potentiometer so that all four LEDs illuminate when the battery voltage is 12.7 volts indicates a full charge with no load on the battery is done. At 11.7 volts, the LED should be made, and shows an empty battery. Each LED is a change of about 25% charge or 300 millivolts, so that 3 LEDs indicate 75%, 2 LEDs indicate 50%, etc.

The actual voltage on the temperature and battery type from, battery wet gel battery, etc . For more information on battery care.

IR remote controller Circuit

I have a number of switch / out with an infrared remote control TV as a transmitter, which is great for me to work yet there is something that I add, or you must remove or change to better? 4013 is configured to switch on / off switch, namely the production will remain high until the clock is replaced by a high level, and will remain until replaced by another , then the output will go low, and so on. if the TV remote control is pressed, it sends the signal (pulse) to the receiver, making the CLK output transistors have to activate the double flip-flop IC, I, nor the 47uF capacitor, so if it is considered that the pulse is High input CLK, while the TV remote control is pressed when you press the remote (off), the pull-down resistor 10K, stream discharge capacitor and the output remains high until the process happens again, then the output remains low, and so on.

Video Activated Relay circuit

If you want  the tuner you need to build the tuner by yourself ? 
The relay contactor output was connecting to electronic circuit by under control.

What is that mean? Can You directly connect the relay to a socket ? and the TV can straight away plug in to the socket? 

For the electronic circuit diagram which is only DC voltage , but i think the tv need AC , Yes?

So,do you need to put a transfomer ? where should you put ? how to decided which kind of transformer to be used?

I think normally is 12Volt or 9Volt transformer? Yes.

Electronic Part List

1. R1, R2   10K 1/4 W Resistor 
2. R3   1K 1/4 W Resistor 
3. R4   33K 1/4 W Resistor 
3. C1  1uF Electrolytic Capacitor 
4. Q1, Q2, Q3   2N2222 NPN Transistor 2N3904 NPN Transistor
5. D1, D2, D3   1N4148 Diode 
6. K1   9V Relay 
7. J1   RCA Jack 

Remark:
1. For you  will be take the circuit to switch for control mains voltage, it should be enclosed in a case.

2. This electronic circuit may be also work with most line level audio, however you may have to change the resistance value of R1 .

Time Delay Relay with IC555 circuit

Parts List

C1    10uf 16V Electrolytic Capacitor
C2         0.01uf Ceramic Disc Capacitor
R1           1  Meg Pot
R2       10 K 1/4 Watt Resistor
D1,D2        1N914 Diodes
U1         555 Timer IC
RELAY          9V Relay
S1          Normally Open Push Button Switch

Remark:
1. We used R1 adjusts the on time.

2. You can get a different capacitor for C1 to change the maximum on time.

3. S1 is used to activate the timing cycle. S1 can be replaced by a NPN transistor so that the circuit may be triggered by a computer, other circuit, etc.

Alternating ON-OFF Switch Circuit

Get the circuit instead of a standard on-off switch. Switching is very gentle. If  we don’t use the PCB, connect unused input pins to an appropriate logic level (’+’ or ‘-’).  Unused output pins *NEED* be left open!

 On the Print Circuit Board this has completed already . One step ’push’ activates the relay, another ‘push’ de-activates the relay.

IC1 (the 4069) is a regular Hex-inverter type and is constructed with MOS P-channel and N-channel
enhancement mode devices in a single monolithic structure. 

Accessories List

R1 = 10K
R2 = 100K
R3 = 10K
R4 = 220 Ohm (optional)
C1 = 0.1µF, Ceramic (100nF)
C2 = 1µF/16V, Electrolytic
D1 = 1N4001
Led1 = Led, 3mm, red (optional)
Q1 = 2N4401 (see text) IC1 = 4069, CMOS, Hex Inverter (MC14069UB), or equivalent
S1 = Momentary on-switch
Ry1 = Relay )

Description of circuit.

   It is going to operate on voltages from 3 to 18 volts, but most applications are in the 5-15 volts.  Although the IC1 4069 contains protection circuitry against damage from ESD , use common sense when handling this device.  Depending on your application you may want to use an IC-socket with IC1.  It makes replacement easy if the IC ever fails.  The IC is CMOS so watch for static discharge!  You can use any type of 1/4 watt resistors including the metal-film type.

    The type for D1 in not critical, even a 1N4148 will work.  But, depending on your application I would suggest a 1N4001 as a minimum if your relay type is 0.5A or more.  Any one in the 1N400x series diodes will work.

Any proper replacement for Q1 will work, including the european TUN’s.  Since Q1 is just a driver to switch the relay
coil, almost any type for the transistor will do.  PN100, NTE123AP, BC547, 2N3904, 2N2222, 2N4013, etc. will all work for the relays mentioned here.  For heavier relays you may need to change Q1 for the appropriate type.

For C2, if you find the relay acts not fast enough, you can change it to a lower value. It is there as a spark-arrestor
together with diode D1.

For the relay I used an 8 volt type with the above circuit and a 9 volt battery.  Depending on your application, if the
current-draw is little, you can use a cheap 5V reed-relay type.  Use a 8V or 9V relay type if your supply voltage is
12V.  Or re-calculate resistor R3 for a higher value.

The circuit and 9V will work fine and will pull the relay between 7 and 9 volt, the only thing to watch for is the
working voltage of C2; increase that to 50V if you use a 12V supply.

The pcb was designed for an Aromat/Omron  relay, 12V/5A, #HB1-DC12V.  You can easily re-design the relay pads on the PCB for the relay of your choice.  If you wish to use something you already have, and you don’t want to re-design the PCB, you can glue the relay up-side-down on the pcb and wire the relay contacts manually to the pcb-holes or directly to your application. Use a 2N2222 transistor for Q1 if your supply voltage is higher than 9V and/or your relay is heavy duty, or doesn’t want to pull-in for any other reason.

Again, the pcb drawing is not to scale.  Use ‘page-setup’ to put the scale to 103% for a single pcb, vertically, and
your scale should be correct.  I use a laser printer and so I don’t know if this scale of 103% is for all printers.  To
check, print a copy onto regular paper and see if the IC pins fit the print.  If so, your copy is correct.  If not,
change the scale up of down until a hardcopy fits the IC perfectly.

The Led is nice for a visual circuit indication of being ‘on’.  For use with 12V supply try making make R4 about 330
ohms.  The LED and R4 are of course optional and can be omitted.  Your application may already have some sort of
indicator and so the LED and R4 are not needed.