Showing posts with label transmitter. Show all posts
Showing posts with label transmitter. Show all posts
Friday, December 12, 2014
Wireless Transmitter for IR Headphone
This circuit shows a Wireless Transmitter for IR Headphone.
Tuesday, November 18, 2014
Simple fm transmitter for the experiment
Simple fm transmitter for the experiment. This designation may be appropriate to call this series, because rangkaianya very simple and suitable for learning / beginners. and preferably when assembling, which assembled its first part oscilator. then we try it first. if able to function normally, we can proceed to the next level up to the booster.
Tuesday, September 9, 2014
Long range FM transmitter
The power output of most of these diagram are very low because no power amplifier stages were incorporated.
The transmitter schema described here has an extra RF power amplifier stage, after the oscillator stage, to raise the power output to 200-250 milliwatts. With a good matching 50-ohm ground plane antenna or multi-element Yagi antenna, this transmitter can provide reasonably good signal strength up to a distance of about 2 kilometres.
The schema built around transistor T1 (BF494) is a basic low-power variable-frequency VHF oscillator. A varicap diode schema is included to change the frequency of the transmitter and to provide frequency modulation by audio signals. The output of the oscillator is about 50 milliwatts. Transistor T2 (2N3866) forms a VHF-class A power amplifier. It boosts the oscillator signals’ power four to five times. Thus, 200-250 milliwatts of power is generated at the collector of transistor T2.
For better results, assemble the schema on a good-quality glass epoxy board and house the transmitter inside an aluminium case. Shield the oscillator stage using an aluminium sheet.
Coil winding details are given below:
L1 - 4 turns of 20 SWG wire close wound over 8mm diameter plastic former.
L2 - 2 turns of 24 SWG wire near top end of L1.
(Note: No core (i.e. air core) is used for the above coils)
L3 - 7 turns of 24 SWG wire close wound with 4mm diameter air core.
L4 - 7 turns of 24 SWG wire-wound on a ferrite bead (as choke)
Potentiometer VR1 is used to vary the fundamental frequency whereas potentiometer VR2 is used as power control. For hum-free operation, operate the transmitter on a 12V rechargeable battery pack of 10 x 1.2-volt Ni-Cd cells. Transistor T2 must be mounted on a heat sink. Do not switch on the transmitter without a matching antenna. Adjust both trimmers (VC1 and VC2) for maximum transmission power. Adjust potentiometer VR1 to set the fundamental frequency near 100 MHz.
This transmitter should only be used for educational purposes. Regular transmission using such a transmitter without a licence is illegal in India
80 MHz 108 MHz FM transmitter circuit
Signals from the microphone in the fm transmitter is reinforced by Q1, Q2 with carrier frequency generator is determined by the C5 and L1. The frequency of the FM transmitter is in the range 80 MHz - 108 MHz. L1 can be made with as many as 24 e-mail wire wrap and 6 wrap. The following is a picture series for the fm transmitter fm transmitter referred to in article 2 of this transistor.
This fm transmitter antenna is connected to the mid point of the antenna length L1 and preferably between 8-12 inches. FM Transmitter is only used for experiment and learning materials are not to be used for day-to-day, because the use of FM transmitter frequency regulated and protected by law may be understandable.
Saturday, August 30, 2014
Transmitter and Receiver Infra Red Headphone
Transmitter and receiver circuit using infra red audio signal is applied to emit an audio signal and will received on a headphones. Making his series is not too difficult, the transmitter and receiver circuit scheme can be seen below.
| Transmiter schematics |
| Receiver schematics |
After the series finished, you can try to give the audio inputs on the transmitter and point the LED transmitter to the receiver. Maximum distance is a few meters may not be more than 10 meters, but you can listen to music without wires while using infra red.
image[link]
Tuesday, August 26, 2014
BH1417 Stereo FM Transmitter
The circuit shown here is of a quality Stereo FM transmitter that might transmit high quality signals up to a variety of 70 feet. The circuit is Depending on BH1417 PLL stereo transmitter IC in one Rhom semiconductors. The IC has separate audio processing sections towards the left and right channels, pre emphasis circuit for improving signal to noise ratio, crystal control circuitry for accurate frequency locking, multiplex circuit for and make sum ( left plus right) and difference ( left minus right).
Another important feature of this IC is that the transmission frequency seem like either set utilizing a 4 channel DIP switch. The IC seem like either powered in one anything between 4 to 6V DC and comes with other an output power around 20mW. At full output power the circuit consumes only 20mA and has a channel separation of 40dB. There {seem to be|appear to be|are} 14 possible preset transmission frequencies, starting in one 88.7MHz and incrementing in steps of 0.2MHz Which is going to be selected utilizing the DIP switch. The PLL circuitry of those IC is so precise that Theres almost no frequency drift.
Sunday, August 24, 2014
One IC Transmitter Wiring diagram Schematic
Free Circuit Diagrams 4U has given you many transmitter schema diagrams today Im going to give you some transmitter schema with some modifications.This schema can send signals up to 100 M.Here we have used IC UPC 1651.This schema can be operated with 6V.The special thing of this schema is we can build this schema with one IC.
Note :
# Build this schema with 6V power supply
# Build this schema on a PCB
Saturday, August 23, 2014
3 3 5 Watt FM transmitter circuit
This is 3-3.5 Watt FM transmitter schema. With this power, it should be able to reach 3-5 KM distance. The frequency range is about 90-110 MHz.
Component list
| Part | Total Qty. | Description | |
| R1,R4,R14,R15 | 4 | 10K 1/4W Resistor | |
| R2,R3 | 2 | 22K 1/4W Resistor | |
| R5,R13 | 2 | 3.9K 1/4W Resistor | |
| R6,R11 | 2 | 680 Ohm 1/4W Resistor | |
| R7 | 1 | 150 Ohm 1/4W Resistor | |
| R8,R12 | 2 | 100 Ohm 1/4W Resistor | |
| R9 | 1 | 68 Ohm 1/4W Resistor | |
| R10 | 1 | 6.8K 1/4W Resistor | |
| C1 | 1 | 4.7pF Ceramic Disc Capacitor | |
| C2,C3,C4,C5,C7,C11,C12 | 7 | 100nF Ceramic Disc Capacitor | |
| C6,C9,C10 | 3 | 10nF Ceramic Disc Capacitor | |
| C8,C14 | 2 | 60pF Trimmer Capacitor | |
| C13 | 1 | 82pF Ceramic Disc Capacitor | |
| C15 | 1 | 27pF Ceramic Disc Capacitor | |
| C16 | 1 | 22pF Ceramic Disc Capacitor | |
| C17 | 1 | 10uF 25V Electrolytic Capacitor | |
| C18 | 1 | 33pF Ceramic Disc Capacitor | |
| C19 | 1 | 18pF Ceramic Disc Capacitor | |
| C20 | 1 | 12pF Ceramic Disc Capacitor | |
| C21,C22,C23,C24 | 4 | 40pF Trimmer Capacitor | |
| C25 | 1 | 5pF Ceramic Disc Capacitor | |
| L1 | 1 | 5 WDG, Dia 6 mm, 1 mm CuAg, Space 1 mm | |
| L2,L3,L5,L7,L9 | 5 | 6-hole Ferroxcube Wide band HF Choke (5 WDG) | |
| L4,L6,L8 | 3 | 1.5 WDG, Dia 6 mm, 1 mm CuAg, Space 1 mm | |
| L10 | 1 | 8 WDG, Dia 5 mm, 1 mm CuAg, Space 1 mm | |
| D1 | 1 | BB405, BB102 or equal (most varicaps with C = 2-20 pF [approx.]) | |
| Q1 | 1 | 2N3866 | |
| Q2,Q4 | 2 | 2N2219A | |
| Q3 | 1 | BF115 | |
| Q5 | 1 | 2N3553 | |
| U1 | 1 | 7810 Regulator | |
| MIC | 1 | Electret Microphone | |
| MISC | 1 | PC Board, Wire For Antenna, Heatsinks |
Source: electronic-lab.com
Wednesday, August 13, 2014
Transmitter Received AM radio
AM Transmitter circuit
To this powerful AM transmitters are huge, using ceramic tuning 3.587 mhz resonator and resonator filters are also sold with a value of 5.5 mhz, 7.7 mhz and 10.7 mhz. Distance transmitter range is approximately 2-4 km. the working principle of this circuit are filter resonator/ceramic filters raise the frequency of the value of the resonator filter.
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