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Category: Inside Circuits Views: 3308 Rank: 4 This Transmitter can be powered by a battery 9V (not more than 12V). You can connect your music source where the microphone is or use a simple condenser microphone. The range of signal can reach 400 meters in open air. The wide range of frequency is up to you. Tune it at FM band (88-108) or TV band 40-80Mhz. Play with the Coil and the variable capacitor to tune it to any frequency you want as long as you got the receiver.  The circuit is as simple as it gets. First stage is the pre-amplifier with BC547 transistor and second comes the transmitter which use the 2N2222 transistor. For antenna use a half meter wire, but for best results the length has to be relative to wave length. A telescopic antenna can be used also. For example at 90Mhz the length has to be around 80cm, at 95Mhz should be 75cm long, or at 100Mhz should be 70cm and so on. The coil L is a 0.8mm wide wire, formed on a 4mm coil diameter. The number of turns and the air distance between the turns depends on the frequency you want to choose. Datasheet file1: Click here to download 2N2222.pdf datasheet. Datasheet file2: Click here to download BC547.pdf datasheet.
Related circuits This receiver uses the NE5212, the Signetics 10116 ECL line receiver, and the Phillips/Amperex BPF31 pin diode. The circuit is a capacitor-coupled receiver and utilizes positive feedback in the last stage to provide the hysteresis. The amount of hysteresis can be tailored to the individual... 0-30 Volts / 2,5A Variable Power Supply This is a high quality power supply with a continuously variable stabilized output adjustable between 0 and 30VDC. the LM 723 is the heart of the power supply which drives the BD137 and then the 2N3055. The circuit provides short circuit protection. And has great stability at voltage changes. Hi-fi-expander-with-de-emphasis The expander to complement the compressor is shown. An external op amp is used for high slew rate. Both the compressor and expander have unity gain levels of 0 dB. Trim networks are shown for distortion (THD) and de shift. The distortion trim should be done first, with an input of 0 dB at 10... The ratio of capacitors Cl and C2 determines division. With a positive pulse applied to the base of Ql, assume that Cl = C2 and that Cl and C2 are discharged. When {31 turns off, both Cl and C2 charge to 10 volts each through R3. On the next pulse to the base of Ql, Cl is again discharged but C2... A building block for audio work, the circuit can be used as a general-purpose preamp. Using an NE602 heterodyne detector and Ul as an RF amplifier, this receiver tunes the middle portion of the l Voltage controlled variable gain amplifier II The 2N5457 acts as a voltage variable resistor with an RdS of 800 ohms max This circuit operates as an oscillator and a timer. The 2N6028 is normally on due to excess holding current through the 100 k resistor. When the switch is momentarily closed, the 10 µ¥ capacitor is charged to a full 15 volts and 2N2926 starts oscillating (1.8 and 820 pF). Build your own Surveillance Spy Bug. FM Transmitter Bug. No special parts ne...
Make a SMD FM Transmitter
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