2N3866 PDF

In this article we learn about a 1 Watt FM Transmitter amplifier with a reasonably balanced design specified to boost a RF frequency in the 88 — MHz spectrum. It may be considered a fairly sensitive configuration when used with quality RF power amplifier transistors, trimmers and inductors. It involves a power amplification factor of 9 to 12 dB 9 to 15 times. At an input power of 0. You could also consider using 2N at 12V However that would yield just an output power of 0.

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In this article we learn about a 1 Watt FM Transmitter amplifier with a reasonably balanced design specified to boost a RF frequency in the 88 — MHz spectrum. It may be considered a fairly sensitive configuration when used with quality RF power amplifier transistors, trimmers and inductors.

It involves a power amplification factor of 9 to 12 dB 9 to 15 times. At an input power of 0. You could also consider using 2N at 12V However that would yield just an output power of 0.

Calibrate R3 as you get the reading near about 0. After this attach the rf source that may be supposed to boost and link up this RF input to the output.

Carefully set up C1 so as to extract the most optimal potential magnitude on the rf link. Next up, rotate R3 once more to acquire 0.

Finally set up C5 and C6 for ensuring the highest output voltage quite between 12V to 18V. Connect again the power and yet again allign C1, C5 and C6 for highest voltage read on the probe. You could think of using a an ammeter for enabling reading the current incourse via T1. This must be restricted below mA at 12V and mA at 24V otherwise the transistor may well fry of.

L2 and L3 coils must be installed at an angle of 90 degrees between the two.

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2N3866 Datasheet, Equivalent, Cross Reference Search

It is an HBT Darlington gain block. There are tons of equivalent parts available from distributors. You can use their parametric search tools to try to narrow it down. You will find you can often buy an MMIC amplifier for less than you could put together one from discretes. Well, 2n have a complement 2n and both cost pennies to buy in quantity. The only reason multi GHz smd transistors are available at low cost is because of mobile phone manufacture which has significantly reduced the price of these transistor devices.

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1 watt, 10km FM Transmitter Circuit

My preferred measurement is the point where the input impedance starts to significantly deviate from its mid- frequency value which is what I have shown above. Item 2 shows the output signal compression commencing at an input voltage of 1V pk- pk. A 2N has been used in place of the 2N with very similar results but the noise figure has not yet been measured. A small heatsink is required to cool the transistor. The dots show the phase of each winding.

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2N3866 RF Transistor x 2

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