Two stage fm transmitter

Tank Circuits as Filters So one of the questions I had on the two stage FM transmitter bug was what these two in-series tank circuits did. What do we know? So we know that tank circuits have calculable resonant frequencies.

Two stage fm transmitter

Two stage fm transmitter

This just another one, a simple two transistor FM transmitter. The first stage of the circuit is a preamplifier stage based on transistor Q1.

This is a collector to base biased amplifier stage where resistor R2 sets the collector current and R1 provided the necessary collector to base bias.

2stage fm transmitter

C1 is the input DC decoupling capacitor which couples the input audio signal to the Q1 base. C8 is the power supply bypass capacitor. Next stage is the oscillator cum modulator stage built around transistor Q2. Electrolytic capacitor C2 couples the output of the first stage to the second stage.

R3 and R4 are the biasing resistors of Q2. R5 is the emitter resistor of Q2. Inductor L1 and trimmer capacitor C5 form the tank circuit which is necessary for creating oscillations. The modulated FM signal is available at the collector of Q2 and it is coupled to the antenna using capacitor C9.

The circuit can be powered from anything between 6 to 12V DC. Using the battery for powering the circuit will improve the performance and reduce noise.

A 9V PP3 battery is a good option. If you are going with a battery eliminator, then it must be well filtered and regulated.

Trimmer C5 can be used for adjusting the transmission frequency. The antenna can be a 1m copper wire. Trimmer capacitor C6 can be adjusted for obtaining the maximum range. Most of the components required for this circuit can be procured from your junk box.two stage fm transmitter This Kit is a powerful two stage, 9V FM transmitter (Tx) with a range of up to 1 kilometer in the open.

It uses an RF transistor in its output stage. The output frequency the transmitter is adjustable from 88 to MHz which is the FM band that is used for radio broadcasting.

Two stage fm transmitter

The circuit as we have already mentioned consists of four stages. Three RF stages and one audio preamplifier for the modulation. This is the FM transmitter circuit which apply 4 radio frequency stages, that are a VHF oscillator designed around transistor BF (T1), a preamplifier designed around transistor BF (T2), a driver designed around transistor 2N (T3) and also a power .

Two-Stage FM Transmitter, or Wireless Microphone - A powerful little circuit with surprisingly good audio quality. Can transmit up to about 1/2 mile in open country. This is probably the most powerful FM transmitter that you can legally purchase.

Jul 30,  · A Dead Simple, Well Constructed FM Transmitter.

Radio Receiver & Transmitter Kits

54 Comments Replace the mic with a receiver with an AF stage and you have a microrepeater that could be swarmed in numbers over a .

Two-Stage FM Transmitter, or Wireless Microphone - A powerful little circuit with surprisingly good audio quality. Can transmit up to about 1/2 mile in open country. This is probably the most powerful FM transmitter that you can legally purchase.

An electret microphone is used.

Transmitter Electronic Circuits or Designs