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Submitted by webmaster on 23 November To bias a transistor we have to supply current to base pin, this current IB should be limited to 5mA. Always try to minimize the track length.

Notify me of new posts by email. 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.

Anything more than 5mA will kill the Transistor; hence a resistor is always added in series with base pin. Of the above types common emitter type is the popular and mostly used configuration. 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 site uses Akismet to reduce spam.


It can amplify power, voltage and current at different configurations. When this transistor is fully biased then it can allow a maximum of mA to flow across the collector and emitter.

Please can You suggest simple as possible pll one. When base current is removed the transistor becomes fully off, this stage is called as the Cut-off Region and the Base Emitter voltage could be around mV. The value of this resistor RB can be calculated using below formulae.

If both C2 and C3 are equal, the effective capacitance will be the half.

Amplifier modules like Audio amplifiers, signal Amplifier etc This FM transmitter circuit performed well in terms of frequency stability, almost zero drifting after about 4 hours of continuous operation. Complete Technical Details can be datashset at the 2N datasheet given at the end of this page. Notify me of follow-up comments by email.

(PDF) C9018 Datasheet download

TL — Programmable Reference Voltage. I really need it. A Transistors acts as an Amplifier when operating in Active Region. As mentioned the biasing current should maximum of 5mA. The value of IB should not exceed mA. You can calculate the effective capacitance of the tuned LC circuit by determining the series capacitance of C2 and C3.


G enameled copper wire. When a transistor is used as a switch it is operated in the Saturation and Cut-Off Region as explained above.

Leave a Reply Cancel reply Your email address will not be published. Fix the inductor with some wax for better frequency stability. The coil is winded on a 3 mm drill bit, 16 turns of 0.

FM transmitter circuit using C transistor – Circuits DIY

When uses as an Amplifier the DC current gain datashete the Transistor can be calculated by using the below formulae. As the transistor supports very high frequency range, you could expect significant amount of harmonics along with the main frequency. After ratasheet, the signals starts fading rapidly.

Learn how your comment data is processed. My prototype without the audio source connected, small enough to fit on a matchbox. Your email address will not be published. Which is undesirable in this case. This circuit uses only 10 parts including the coil.