4 Watts FM transmitter circuit diagram
R1, R2 = 10K Ohm (1/4 W)
R3 = 47 Ohm (1/4 W)
C1, C2 = 1nF
C3 = 4,7uF/16V
C4, C7, C8 = 0~45pF trimmer
C5, C6 = 10pF
C9 = 100nF
T1, T2 = 2N2219
ANT = Simple dipole l/2.
MIC IN = Microphone dynamic or other type. (It can also connected to a cassette player unit)
Inductor (L) specifications:
L1 = 4 turns, 7mm diameter *
L3 = 3 turns, 7mm diameter *
L4 = 5 turns, 7mm diameter *
L2 = RFC (resistance 1 MOhm with wrapped around her inductor of enough coils from fine isolated wire. Scratch of utmost inductor and you stick in utmost the resistance making thus a parallel L-r circuit.)
* The inductors is air from wire of coaxial 75W or other 1mm roughly.
This schematic diagram come from circuit: 4 Watts FM Transmitter
Go to that page to read the explanation about above circuit design.
In the electrical sector, a schematic diagram is usually used to describe the design or model of equipment. Schematic diagrams are usually utilized for the maintenance and repair of electronic and electromechanical devices / units. Original schematics were made by hand, using standardized templates or pre-printed adhesive symbols, but nowadays Electrical CAD computer software is often used.
In electronic design automation, until the 1980s schematics were virtually the only formal representation for circuits. More lately, using the progress of computer system technology, other representations were introduced and specialized computer languages were developed, because with the explosive development of the complexity of electronic circuits, classic schematics are getting less practical. As an example, hardware description languages are indispensable for contemporary digital circuit design.