Showing posts with label control. Show all posts
Showing posts with label control. Show all posts
Tuesday, October 1, 2013
TV Remote Control Jammer
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.
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.
Wednesday, September 11, 2013
Build a Telephone Record Control Circuit Diagram
This simple Telephone Record Control Circuit Diagram will allow you to connect any tape recorder that has a mic and remote input to a phone line and automatically record both sides of a conversation when ever the phone is in use. You will need to take a couple of voltage readings before connecting the circuit. First determine the polarity of your phone line and connect it to the circuit as shown and then determine the polarity of the remote input and connect it to the circuit.
Circuit operation is as follows. When the phone is on hook the voltage across the phone line is about 48volts dc. When the phone is off hook the voltage will drop to below 10volts dc. When the line voltage is at 48volts the FET is off which causes Q2 and Q3 to be off. When the phone is picked up the FET turns on along with Q2 and Q3 which turns your recorder on. The tape recorder must be in the record mode at all times. As you can see the power source for the circuit is the phone line.
Circuit operation is as follows. When the phone is on hook the voltage across the phone line is about 48volts dc. When the phone is off hook the voltage will drop to below 10volts dc. When the line voltage is at 48volts the FET is off which causes Q2 and Q3 to be off. When the phone is picked up the FET turns on along with Q2 and Q3 which turns your recorder on. The tape recorder must be in the record mode at all times. As you can see the power source for the circuit is the phone line.
Telephone Record Control Circuit Diagram
Sunday, May 5, 2013
Lights Control for Model Cars Circuit Diagram
The author gave his partner a radio controlled (RC) model car as a gif t. She found it a lot of fun, but thought that adding realistic lights would be a definite improvement. So the author went back to his shed, plugged in his soldering iron, and set to work equipping the car with realistic indicators, headlights, tail lights and brake lights.
Lights Control for Model Cars Circuit Diagram
The basic idea was to tap into the signal from the radio control receiver and, with a bit of help from a microcontroller, simulate indicators using flashing yellow LEDs and brake lights using red LEDs. Further red LEDs are used for the tail lights, and white LEDs for the headlights. Connectors JP4 and JP5 (channel 0) are wired in parallel, as are JP6 and JP7 (channel 1), allowing the circuit to be inserted into the servo control cables for the steering and drive motor respectively. The ATtiny45 micro-controller takes power from the radio receiver via diode D1. T1 and T2 buffer the servo signals to protect IC1’s inputs from damage.
IC1 analyses the PWM servo signals and gen-erates suitable outputs to switch the LEDs via the driver transistors. T3 drives the two left indicators (yellow), T4 the two right indica-tors, and T5 the brake LEDs (red). The red tail lights (JP2-8 and JP2-8) and the white head-lights (JP2-9 and JP2-10) are lit continuously. The brake lights are driven with a full 20 mA, so that they are noticeably brighter than the tail lights, which only receive 5 mA. If you wish to combine the functions of tail light and brake light, saving t wo red LEDs, sim-ply connect pin 10 of JP2 to pin 14 and pin 12 to pin 16. Then connect the two combined brake/tail LEDs either at JP2-5 and JP2-6 or at JP2-7 and JP2-8.
JP3 is provided to allow the use of a separate lighting supply. This can either be connected to an additional four-cell battery pack or to the main supply for the drive motor. The val-ues given for resistors R8 to R17 are suitable for use with a 4.8 V supply. JP2 can take the form of a 2x10 header.
As usual the sof t ware is available as a free download from the Elektor web pages accom-panying this article[1], and ready-programmed microcontrollers are also available. The microcontroller must be taught what servo signals correspond to left and right turns, and to full throttle and full braking. First connect the fin-ished circuit to the radio control electronics in the car, making sure everything is switched of f. Fit jumper JP1 to enable configuration mode, switch on the radio control transmit-ter, set all proportional controls to their cen-tre positions, and then switch on the receiver. The indicator LEDs should first flash on both sides. Then the car will indicate left for 3 s: during this time quickly turn the steering on the radio control transmitter fully to the left and the throt tle to full reverse (maximum braking).
Hold the controls in this position until the car starts to indicate right. Then set the controls to their opposite extremes and hold them there until both sides flash again. Now, if the car has an internal combustion engine (and so cannot go in reverse), keep the throttle control on full; if the car has an electric motor, set the throttle to full reverse. Hold this position while both sides are flashing. Configuration is now complete and JP1 can be removed. If you make a mistake during the configuration process, start again from the beginning.
JP3 is provided to allow the use of a separate lighting supply. This can either be connected to an additional four-cell battery pack or to the main supply for the drive motor. The val-ues given for resistors R8 to R17 are suitable for use with a 4.8 V supply. JP2 can take the form of a 2x10 header.
As usual the sof t ware is available as a free download from the Elektor web pages accom-panying this article[1], and ready-programmed microcontrollers are also available. The microcontroller must be taught what servo signals correspond to left and right turns, and to full throttle and full braking. First connect the fin-ished circuit to the radio control electronics in the car, making sure everything is switched of f. Fit jumper JP1 to enable configuration mode, switch on the radio control transmit-ter, set all proportional controls to their cen-tre positions, and then switch on the receiver. The indicator LEDs should first flash on both sides. Then the car will indicate left for 3 s: during this time quickly turn the steering on the radio control transmitter fully to the left and the throt tle to full reverse (maximum braking).
Hold the controls in this position until the car starts to indicate right. Then set the controls to their opposite extremes and hold them there until both sides flash again. Now, if the car has an internal combustion engine (and so cannot go in reverse), keep the throttle control on full; if the car has an electric motor, set the throttle to full reverse. Hold this position while both sides are flashing. Configuration is now complete and JP1 can be removed. If you make a mistake during the configuration process, start again from the beginning.
Author: Manfred Stratmann - Copyright : Elektor
Wednesday, April 10, 2013
Control Switch for Fan and Air Conditioner
An electronic switch that can be used to switch on both the air-conditioner as well as fan of your room, one by one. The circuit consists of power supply and control sections. The power supply section is built around transformer X1, bridge rectifier BR1 and filter capacitor C1. The 50Hz, 230V AC mains is stepped down by transformer X1 to deliver a secondary output of 9V, 300 mA. The transformer output is rectified by the bridge rectifier and filtered by capacitor C1.
When the mains is switched on for the first time, pin 3 of IC CD4017 (IC1) goes high and relay RL1 energies to switch on the fan. When mains is briefly switched off using S1 and then switched on, the power to IC1 is maintained by the charge on capacitor C1. At the same time, there is a trigger pulse on the clock input (pin 14) of IC1, which advances the decade counter and relay RL2 energies to switch-on the air-conditioner. Both the air-conditioner and the fan will be turned off if the switch is in the ‘off’ position.
Assemble the circuit on a general-purpose PCB and enclose in a suitable case. Fix the unit onto the switchboard. Use relays RL1 and RL2 with proper contact ratings. The current rating depends on the load that you are going to control.
Assemble the circuit on a general-purpose PCB and enclose in a suitable case. Fix the unit onto the switchboard. Use relays RL1 and RL2 with proper contact ratings. The current rating depends on the load that you are going to control.
Monday, April 1, 2013
Infrared Remote control transmitters
This is Infrared Remote control transmitter circuit has high performance and can be applied to works with the various infrared receiver circuit. To made easily. And best to save your money.
I need not tell you much, what is the infra red remote control. Because you have known as well. so I recommend circuits 2 types, as appropriate.
- The first is simple circuits. Infrared light from a set to a set to work immediately.
- Then another circuits, is designed to have wider applications. Can be set program that will be must have a beam of infrared light to circuits few times to work.
Which both need to have the good Infrared Remote control circuit, before.
The infrared remote control transmitter circuit.
Usually, when input voltage to the infrared diode. Will be have the beam infrared light which can be seen with the naked eye out
-But in real applications. We need to enter the signal pulse with a frequency of about 5kHz, to the infrared diode, for eliminate the various interference. And reduce the power supplied to the diode.
In the first circuits, to be a simple infrared transmitter with IC-555 timer to an oscillator generator at frequency of 5kHz, that is set with R1,R2 and C2. The output signal will have signal period on-off 1:1
The resistor R3 is used to limit current flow through the infra red diode under 50mA.
If you want the infrared transmitter that has the signal strength is very high. You can be done by adding the output transistors. Enable With the infrared diodes up to three tubes.
Be seen from the circuit, IC 555 use to function frequency generator is 5000Hz as well. The frequency of the circuit is determined by the VR1, R1, R2 and C1, we can customize the frequency by adjusting VR1.
Output of IC is supplied to the transistor Q1-BD137 to drive infrared diodes with high current to 100mA. Risisetars R3 in the circuit should not be less than 3.9 ohm as it may cause damage to TR1. R4 and LED1 to indicate that the voltage supply to the circuits.
Read More..
I need not tell you much, what is the infra red remote control. Because you have known as well. so I recommend circuits 2 types, as appropriate.
- The first is simple circuits. Infrared light from a set to a set to work immediately.
- Then another circuits, is designed to have wider applications. Can be set program that will be must have a beam of infrared light to circuits few times to work.
Which both need to have the good Infrared Remote control circuit, before.
The infrared remote control transmitter circuit.
Usually, when input voltage to the infrared diode. Will be have the beam infrared light which can be seen with the naked eye out
-But in real applications. We need to enter the signal pulse with a frequency of about 5kHz, to the infrared diode, for eliminate the various interference. And reduce the power supplied to the diode.
In the first circuits, to be a simple infrared transmitter with IC-555 timer to an oscillator generator at frequency of 5kHz, that is set with R1,R2 and C2. The output signal will have signal period on-off 1:1
The resistor R3 is used to limit current flow through the infra red diode under 50mA.
If you want the infrared transmitter that has the signal strength is very high. You can be done by adding the output transistors. Enable With the infrared diodes up to three tubes.
Be seen from the circuit, IC 555 use to function frequency generator is 5000Hz as well. The frequency of the circuit is determined by the VR1, R1, R2 and C1, we can customize the frequency by adjusting VR1.
Output of IC is supplied to the transistor Q1-BD137 to drive infrared diodes with high current to 100mA. Risisetars R3 in the circuit should not be less than 3.9 ohm as it may cause damage to TR1. R4 and LED1 to indicate that the voltage supply to the circuits.
Infrared transmitters by LM3909
This is an infrared transmitters signal circuit that is small size and using a power supply 1.5V only. by main electronic part are two the LM3909 (a LED Flasher Oscillator IC) Normally, we tend to put it to use as a simple flashing light circuit. Using a 1.5V low power supply, it’s working now, Easier to use transistors. The high frequency, it is very simple, just change the device to high frequency only. C1 and R1 is lower the higher frequency.
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