FM Transmitter

DESCRIPTION This ZIP file contains information about building a small radio transmitter, which has a PCB 1.75 x 2.5 (45mm x 68 mm) and has a range of about 30 yards or so. The documentation with the circuit says the freq range is 100-108 MHz, but I h

Posted at 10-05-12 by Sky views(2760)

Portable FM transmitter 1 W

Introduction This small FM transmitter includes a limiter, a microphone amplifier and a PLL digital tuning. All the parts are placed on one circuit board. The RF power is switchable between 1 W (HI) and 0,2 W (LO). Technical specifications Supply vo

Posted at 10-05-12 by Sky views(2418)

PLL bug transmitter

PLL bug transmitter This is strictly an educational project explaining how a transmitter works and can be built. This project may well be illegal to use but this is up to you to investigate. This frequency of this transmitter is PLL controlled which

Posted at 10-05-12 by Sky views(4684)

800m (2400ft) FM transmitter that fits on top of a 9v battery.

This is one of the smallest and neatest FM transmitters to be presented as a construction project and it has the advantage of being available as a complete kit of parts. This will save going to a number of suppliers as no single supplier has all the

Posted at 10-05-12 by Sky views(13079)

FM TRANSMISSION

FM Transmission is one of the most interesting branches of electronics. It's an ideal place to start as the circuits are very simple and produce absolutely amazing results. With as few as 20 components, a circuit can be designed totransmit an impress

Posted at 10-05-12 by Sky views(4577)

Easy FM transmitter 0,4 W

Technical specifications Power supply: 12-14 V stab., 100 mA RF power: 400 mW Impedance: 50-75 ohm Frequency range: 87,5-108 MHz Modulation: wideband FM Schematic diagram Parts list Capacitors: C1, C2, C12 - 100 pF (ceramic) C3, C5 - 0,22 uF (electr

Posted at 10-05-12 by Sky views(6734)

Long-range FM Transmitter

Several circuits for constructing FM transmitters have been published in EFY. The power output of most of these circuits are very low because no power amplifier stages were incorporated. The transmitter circuit described here h

Posted at 10-05-12 by Sky views(3020)

The different 2SC1970 C1971 2SC1972 RF power amplifiers

C1970 NPN 40V0.6A PQ=1.3W/175MHZ C1971 35V 2.0A PQ=7.0W/175MHZ C1972 35V 3.5A PQ=15W/175MHZ

Posted at 10-03-11 by Admin views(7844)

3 Watt FM Transmitter

This is the schematic for an FM transmitter with 3 to 3.5 W output power that can be used between 90 and 110 MHz. Although the stability isn't so bad, a PLL can be used on this circuit. This is a circuit that I've build a few years ago for a frien

Posted at 10-05-13 by Sky views(6189)

The PC Board Artwork for The Wasp

The PC Board Artwork for The Wasp SENSITIVITY The sensitivity of the WASP depends to a large extent on the value of the load resistor on the electret microphone. We have used 39k in the project, as the microphone we supply is a v

Posted at 10-05-12 by Sky views(1841)