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After that, the signals starts fading rapidly. The value of this resistor RB can be calculated using below formulae. Fix the inductor with some wax for better frequency stability.

TL — Programmable Reference Voltage. As the transistor supports very high frequency range, you could expect significant amount of harmonics along with the main frequency. The value of IB should not exceed mA. Amplifier modules like Audio amplifiers, signal Amplifier etc Notify me of new posts by email.

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As discussed a transistor will act as an Open switch during Forward Bias and as a closed switch during Reverse Bias, this biasing can be achieved by supplying the required amount of current to the base pin.

This FM transmitter circuit performed well in terms of frequency stability, almost zero drifting after about 4 hours of continuous operation. Your email address will not be published.


G enameled copper wire. Which is undesirable in this case.

When uses as an Amplifier the DC current gain of the Transistor can be calculated by using the below formulae. Leave a Reply Cancel reply Your email address will not be published. Learn how your comment data is processed. The maximum amount of current that could flow through the Collector pin is mA, hence we cannot connect loads that consume more than mA using this transistor.

The coil is winded on a 3 mm drill bit, 16 turns of 0. Submitted by webmaster on 23 November Complete Technical Details can be found at the 2N datasheet given at the end of this page.

FM transmitter circuit using C9018 transistor

Of the above types common emitter type is the popular and mostly used configuration. Anything more than 5mA will kill the Transistor; hence a resistor is always added in series with base pin. It can amplify power, voltage and current at different configurations. If both C2 and C3 are equal, the effective dwtasheet will be the half.

To bias a transistor we have to supply current to base pin, this current IB should be limited to 5mA. A Transistors acts as an Amplifier when operating in Active Region.


My prototype without the audio source connected, small enough to fit on a matchbox. This site uses Akismet to reduce spam. When this transistor is fully biased then it can allow a maximum of mA to flow across the collector and emitter.

You can calculate the effective capacitance of the tuned LC circuit by determining the series capacitance of C2 and C3. Notify me of follow-up comments datadheet email. When base current is removed the datazheet becomes fully off, this stage is called as the Cut-off Region and the Datxsheet Emitter voltage could be around mV.

When a transistor is used as a switch it is operated in the Saturation and Cut-Off Region as explained above. As mentioned the biasing current should maximum of 5mA.

FM transmitter circuit using C transistor – Circuits DIY

Please can You datzsheet simple as possible pll one. I really need it. This circuit uses only 10 parts including the coil. Always try to minimize the track length.