| d/p level transmitter | | 2008-07-20 05:58:34 | | we had installed d/p transmitter on the close tank, the low side of the d/p transmitter connected to the bottom side of the tank, and the high side of the d/p transmitter connected to the top side of the tank, thefore does will effect the measurement of the level.... | | By: CR4: The Engineer's Place for Discussion & New | | |
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| Make a Micro FM Transmitter | | 2008-03-23 00:00:00 | | Learn to build a simple FM transmitter that can be used to eavesdrop on your workmates or friends. It's pretty hard to believe that these generic micro transmitter (bug) circuits give such high quality reception on a standard FM radio. But they do!... | | By: HacknMod - You name it. We hack it. | | |
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| Telephone Listening Bug with FM Transmitter by A933 | | 2008-03-06 23:51:07 | | Here is a simple transmitter that when connected to a phone line, will transmit anything on that line (execpt the dial tone) to any FM radio. The frequency can be tuned from 88 to about 94Mhz and the range is about 200 feet. It is extremely easy to build and is therefore a good, useful [...]... | | By: Circuit Project Electronic | | |
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| CB Transmitter by 2N3553 - BD329 | | 2008-01-12 10:59:30 | | For the regulation it needs a voltmeter (with needle better) and charge 50W/5W. Connect charge 50W in the place of aerial, with the voltmeter in the exit voltmeter. Be supplied the transmitter with + 12V. It will be supposed we have consumption between 0,7-1A. With a screwdriver we regulate the core of inductor L1/L2 and [...]... | | By: Circuit Project Electronic | | |
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| High Quality 200mW FM Transmitter by BF199 | | 2007-12-20 09:14:40 | | Here is the latest and greatly improved TX200 VFO/VCO FM transmitter. The most versatile transmitter to date that can be turned into high fidelity stereo PLL based 200mW FM transmitter. It is a perfect circuit for transmitting your music around the house and yard. TX200 uses only two coils; one in the oscillator and [...]... | | By: Circuit Project Electronic | | |
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| 50-300mW FM Transmitter by BC549 | | 2007-12-20 09:09:47 | |
Here it is a brand new TX300 FM transmitter. The amplifier has exactly the same architecture as TX500 with the difference that TX300 has only one stage variable VHF amplifier. It is a cute schematic that was made for all of you who wanted something even simpler than TX500 and with not as many necessary [...]... | | By: Circuit Project Electronic | | |
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| BH1417 Stereo PLL FM Transmitter | | 2007-12-18 06:28:36 | | This is the latest BH1417 FM Transmitter design from RHOM that includes a lot of features in one small package. It comes with pre-emphasis, limiter so that the music can be transmitted at the same audio level, stereo encoder for stereo transmission, low pass filter that blocks any audio signals above 15KHz to prevent any [...]... | | By: Circuit Project Electronic | | |
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| VHF Test Transmitter | | 2007-11-26 09:40:07 | | If you want to be independent of the local radio stations for testing VHF receivers, you need a frequency-modulated oscillator that covers the range of 89.5 to 108 MHz — but building such an oscillator using discrete components is not that easy. Maxim now has available a series of five integrated oscillator building blocks in [...]... | | By: Circuit Project Electronic | | |
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| BA1404 HI-FI Stereo FM Transmitter | | 2007-10-25 19:44:04 | | Whether you want to create your own radio station, transmit the music around the house, or simply create a wireless link between your iPod and a receiver in your car, this transmitter will let you do these things easily. With BA1404 HI-FI Stereo transmitter you will be able to transmit MP3 music from your iPod, [...]... | | By: Circuit Project Electronic | | |
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| Long range FM transmitter | | 2007-10-24 18:58:15 | | The power output of most of these circuits are very low because no power amplifier stages were incorporated.
The transmitter circuit 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 [...]... | | By: Circuit Project Electronic | | |
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| Coil-less FM Transmitter by IC 40106 | | 2007-10-24 18:54:07 | | The RF oscillator using the inverter N2 and 10.7Mhz ceramic filter is driving the parallel combination of N4 to N6 through N3.Since these inverters are in parallel the output impedance will be low so that it can directly drive an aerial of 1/4th wavelength. Since the output of N4-N6 is square wave there will be [...]... | | By: Circuit Project Electronic | | |
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| FM Transmitter with 2N2222 | | 2007-09-10 17:46:38 | | The range of the transmitter when running at 9V is about 300 feet. Running it from 12V increases the range to about 400 feet.
Parts
C1 1 0.001uf Disc Capacitor
C2 1 5.6pf Disc Capacitor
C3,C4 2 10uf Electrolytic Capacitor
C5 1 3-18pf Adjustable Cap
R1 1 270 Ohm 1/8W Resistor 270 Ohm 1/4W Resistor
R2,R5,R6 3 4.7k 1/8W Resistor 4.7K 1/4W Resistor
R3 1 10k 1/8W Resistor 10K 1/4W Resistor
R4 1 100k 1/8W Resistor 100K 1/4W Resistor
Q1, Q2 2 2N2222A NPN Transistor 2N3904, NTE123A
L1, L2 2 5 [...]... | | By: Circuit Project Electronic | | |
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| 1.5 Volt Tracking FM Transmitter | | 2007-09-10 17:40:09 | | Operates from 87-109MHz. The current draw for this tracker is 3.7mA, so the 1.5V button cell will last a while. My experimental version was tuned to 87.6MHz and worked as expected on only 1.5 volts.
When your circuit is working you should see the LED flash quite fast. Take your FM radio and search for the [...]... | | By: Circuit Project Electronic | | |
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| Kensington QuickSeek FM Transmitter | | 2007-05-15 22:50:23 | | iPod FM transmitters are nothing new, but Kensington has a spanking new model in the form of the QuickSeek iPod FM Transmitter that stands out from the crowd as it boasts the ability to search for the clearest radio station at the press of a button. This works great when your musical experience is constantly [...]... | | By: Mobile & Technology News | | |
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