Showing posts with label transmitter. Show all posts
Showing posts with label transmitter. Show all posts
Tuesday, November 18, 2014
Tracking FM Transmitter Schematics
FM tracer was prepared using the LM3909 IC and some supporting components. 1.5V FM trackers This will provide an indicator of revenue sources by providing a signal emitted by the LED. FM tracking uses a source voltage of the battery cell and fruit consumption current is 3.7 mA.
After completion of assembling Tracker FM 1.5V, then the next step is setting the operating frequency of the FM tracker is, for convenience we can use the FM receiver and adjust the working frequency FM 1.5V Tracking (tracking transmitter) by regulating C3.Have been obtained if the working frequency Tracking FM 1.5V (tracking transmitter) then the corresponding LED will light emitted by the transmitter information such as sound through an FM receiver is terdengan. 1.5V FM tracker (tracking transmitter) can use a regular 12-inch antenna. Playing and learning electronics that will be happy,
1.5 Volt Tracking FM circuit (Tracking Transmitter)
Circuit Description 1.5 Volt Tracking FM (Tracking Transmitter)
- For stability, use a NPO types for C2 & C4.
- Tolerance for R1 should be 1 or 2%.
- Frequency range is usually 87-109Mhz FM.
- Email wire used in wire coil is made of hookup 22 ga, like the solid Bell phone wire.
Monday, October 20, 2014
Build a 4 Transistor FM Transmitter Circuit Diagram
4 Transistor FM Transmitter Circuit Diagram
Build a 4 Transistor FM Transmitter Circuit Diagram. This 4 Transistor FM Transmitter Circuit Diagram provides an FM modulated signal with an output power of around 500mW. The input microphone pre-amp is built around a couple of 2N3904 transistors (Q1/Q2), and audio gain is limited by the 5k preset trim potentiometer.
The oscillator is a colpitt stage, frequency of oscillation governed by the tank circuit made from two 5pF ceramic capacitors and the L2 inductor. The output stage operates as a Class D amplifier, no direct bias is applied but the RF signal developed across the 3.9uH inductor is sufficient to drive this stage. The emitter resistor and 1k base resistor prevent instability and thermal runaway in this stage.
Saturday, August 23, 2014
Long range AM transmitter Circuit
This is a long range transmitter.This schema can send signals up to 2km.So that you have to use 1m copper wire.The power of this transmitter has been increased by usin two transistors. When you use this transmitter do give power with out connecting the antenna.Because it will burn your transistors.
Note
# The transformer T1 can be a general purpose audio driver transformer seen in transistor radios.
# The inductor L1 can be made by making 56 turns of 365 WG enameled copper wire on a 1 cm former.
# Inductor L2 can be a 10 mH general purpose radio frequency choke.
# The schema can be powered from a 9V PP3 battery.
Wednesday, August 20, 2014
Mini FM Transmitter
Here the schematic diagram of mini and simple fm transmitter.
Supply voltage : 1.1 - 3 Volts
Power consumption : 1.8 mA at 1.5 Volts
Range : 30 meters max. at 1.5 Volts
Here the PCB Layout:
Read More..
Supply voltage : 1.1 - 3 Volts
Power consumption : 1.8 mA at 1.5 Volts
Range : 30 meters max. at 1.5 Volts
Here the PCB Layout:
Visit this page for complete explanation
Thursday, August 14, 2014
9V Mini FM Transmitter
The following diagram is the schema diagram of 9V Mini FM Transmitter.
Schematic diagram:
Components List:
R1,R3 = 100K
R2 = 10K
R4 = 470 ohm
C1,C4 = 470pF
C2,C3 = 4.7µF/16V
C5,C6 = 4.7pF
C7 = 4-40pF trimmer cap (optional, see text)
L1 = 1µH
Q1,Q2 = 2N2222, NPN transistor
Mic = Electret Microphone
B1 = 9 Volt battery
Circuit Notes:
Absolutely nothing crucial here. To get a bit of tuning out of the coil you could put a 4-40pF trimmer capacitor (optional) parallel over the 1 µH coil, L1.
C1/C4 and C5/C6 are ceramic capacitors, preferably NPO (low noise) types. C2/C3 are electrolytic or can be tantalum kinds.
In the event you determine to substitute transistors with some thing similar you already have, it perhaps necessary adjust the collector voltage of Q1 by changing the value of R2 or R3 (simply because you alter transistors, it changes this bias on the base of Q1). It ought to be about 1/2 the supply voltage (about four or 5v).
The antenna is nothing more than a piece of 12" wire or a piece of piano wire from 6" to 12".
To find the signal on your regular FM Radio dial, make certain theres a signal coming into the microphone, otherwise the schema will not function. I use an old mechanical alarm clock (you know, with those two big bells on it). I put this clock by the microphone which picks up the loud tick-tock. Im certain you get the concept... Or you can just lightly tap the microphone whilst looking for the location of the signal on your receiver.
The antenna is nothing more than a piece of 12" wire or a piece of piano wire from 6" to 12".
To find the signal on your standard FM Radio dial, make sure there is a signal coming into the microphone, otherwise the schema wont work. I use an old mechanical alarm clock (you know, with those two large bells on it). I put this clock by the microphone which picks up the loud tick-tock. Im sure you get the idea... Or you can just lightly tap the microphone while searching for the location of the signal on your receiver.
Source: http://www.sentex.ca/~mec1995/circ/fmt4.html
Design by Tony van Roon
Read More..
Schematic diagram:
Components List:
R1,R3 = 100K
R2 = 10K
R4 = 470 ohm
C1,C4 = 470pF
C2,C3 = 4.7µF/16V
C5,C6 = 4.7pF
C7 = 4-40pF trimmer cap (optional, see text)
L1 = 1µH
Q1,Q2 = 2N2222, NPN transistor
Mic = Electret Microphone
B1 = 9 Volt battery
Circuit Notes:
Absolutely nothing crucial here. To get a bit of tuning out of the coil you could put a 4-40pF trimmer capacitor (optional) parallel over the 1 µH coil, L1.
C1/C4 and C5/C6 are ceramic capacitors, preferably NPO (low noise) types. C2/C3 are electrolytic or can be tantalum kinds.
In the event you determine to substitute transistors with some thing similar you already have, it perhaps necessary adjust the collector voltage of Q1 by changing the value of R2 or R3 (simply because you alter transistors, it changes this bias on the base of Q1). It ought to be about 1/2 the supply voltage (about four or 5v).
The antenna is nothing more than a piece of 12" wire or a piece of piano wire from 6" to 12".
To find the signal on your regular FM Radio dial, make certain theres a signal coming into the microphone, otherwise the schema will not function. I use an old mechanical alarm clock (you know, with those two big bells on it). I put this clock by the microphone which picks up the loud tick-tock. Im certain you get the concept... Or you can just lightly tap the microphone whilst looking for the location of the signal on your receiver.
The antenna is nothing more than a piece of 12" wire or a piece of piano wire from 6" to 12".
To find the signal on your standard FM Radio dial, make sure there is a signal coming into the microphone, otherwise the schema wont work. I use an old mechanical alarm clock (you know, with those two large bells on it). I put this clock by the microphone which picks up the loud tick-tock. Im sure you get the idea... Or you can just lightly tap the microphone while searching for the location of the signal on your receiver.
Source: http://www.sentex.ca/~mec1995/circ/fmt4.html
Design by Tony van Roon
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