radio transmitter | Electronic Schematic Diagram https://electronicscheme.net Schematic Diagram & PCB Design Thu, 25 Sep 2014 07:08:56 +0000 en-US hourly 1 https://i0.wp.com/electronicscheme.net/wp-content/uploads/2017/05/cropped-transparent_text_effect.png?fit=32%2C32&ssl=1 radio transmitter | Electronic Schematic Diagram https://electronicscheme.net 32 32 129969089 9V FM Radio Transmitter https://electronicscheme.net/9v-fm-radio-transmitter/?utm_source=rss&utm_medium=rss&utm_campaign=9v-fm-radio-transmitter https://electronicscheme.net/9v-fm-radio-transmitter/#comments Thu, 17 Dec 2009 10:10:55 +0000 http://electronicscheme.net/?p=340 Here the simple and low cost FM transmitter circuit. The frequency range of this FM transmitter should be about 89MHz ? 109MHz. Output power is […]

The post 9V FM Radio Transmitter first appeared on Electronic Schematic Diagram.]]> 9V FM Radio Transmitter circuit diagram

Here the simple and low cost FM transmitter circuit. The frequency range of this FM transmitter should be about 89MHz ? 109MHz. Output power is about 9mW at 9V.

Components List:

Resistors:
R1, R6        : 12K
R2, R4        : 100K
R3            : 22K
R5            : 1K
R7            : 100R

Capacitors:
C1            : 10uF/25V
C2            : 22n
C3            : 10n
C4            : 3n3
C5            : 2p7
C6            : 22p 
C7            : 100uF/16V
Trimmer       : 0-30pF tuning capacitor

Mic           : ECM-60P

Transistors:
Q1            : BC338
Q2            : BC548B

The battery supply rails have been well tied together with respect to radio frequencies (C1, C2 and C7.) The tracks are also thicker. This makes the circuit a single “solid” block eliminating RF currents in different parts of the circuit. This also means the battery no longer has RF on it which makes the whole unit a lot more frequency stable. A battery is perfect choice.

Download the complete explanation of this FM Transmitter (include circuit diagram, component list, the circuit’s work) in PDF format:
[wpdm_file id=42]

Source: kitrus.com

The post 9V FM Radio Transmitter first appeared on Electronic Schematic Diagram.]]> https://electronicscheme.net/9v-fm-radio-transmitter/feed/ 10 340 1.5 Watt FM Transmitter https://electronicscheme.net/15-watt-fm-transmitter/?utm_source=rss&utm_medium=rss&utm_campaign=15-watt-fm-transmitter https://electronicscheme.net/15-watt-fm-transmitter/#comments Thu, 14 May 2009 20:43:41 +0000 http://electronicscheme.net/?p=92 This is a simple, well designed 1.5 Watt FM Transmitter circuit using power transistor 2N2219A. This circuit should be able to cover 1-2 KM range. […]

The post 1.5 Watt FM Transmitter first appeared on Electronic Schematic Diagram.]]> This is a simple, well designed 1.5 Watt FM Transmitter circuit using power transistor 2N2219A. This circuit should be able to cover 1-2 KM range. It use +5-30V power supply to work.

1.5 Watt FM Transmitter circuit diagram

Refer to the above diagram, the input source is an electret condenser microphone (you may try to? use other input sources) and signal gain from the input can be adjusted by using the potentiometer P1. You can easily prepare the PCB by using any PCB editor and apply it to the board by using the ironing method. The coils and the antenna can be designed as a part of the PCB made up of the copper area.

Components List:

R1=220K
R2=4.7K
R3,R4=10K
R5=100ohm		 C1,C2=4.7uF Electrolytic
C3,C4=1nF
C5=2-15pF
C6=3.3pF		 Q1=BC547C
Q2=2N2219A
P1=25K
MIC=Electret Condenser Type

P1 act as condenser microphone volume level. For FM, coil will be small. Use thin gauge enamel magnet wire. the diameter of coil will be a couple mm: use ink tube from pen to form, and try 8-12 turns. Small inductance coils make for much guess work.

Good luck.

The post 1.5 Watt FM Transmitter first appeared on Electronic Schematic Diagram.]]> https://electronicscheme.net/15-watt-fm-transmitter/feed/ 40 92