1.5 Volt Tracking Transmitter: 10W HF Linear Amplifier: 2 Transistor FM Transmitters: 2 Valve 40m CW Transmitter: 222 MHz Transverter: 2N2222 40 Meter CW / DSB Tranceiver:

3 Watt FM Transmitter:

30 Meter QRP Transmitter for Morse Code:

3W HF QRP Linear Amplifier:

4 Transistor Tracking Transmitter:

4 Transistor Transmitter:

49MHz Walkie Talkie:

500mW HF Linear Amplifier:

56K RF Modem:

80 Meter DSB Transmitter:

807 and 1625 Valves: data on vacuum tubes 807 and 1625 used in ham radio transmitters. Describes various pin voltages and different operation modes.

AM / FM / SW Active Antenna: This circuit shows an active antenna that can be used for AM, FM, and shortwave SW. On the shortwave band this active antenna is comparable to a20 to30 foot wire antenna. This circuit uses receivers that use untuned wire antennas, such as inexpensive units and car radios. L1 can be selected for the application

AM Transmitter:

AT Volt Repeater Controllers:

Basic FM Radio Transmitters:

Basic RF Oscillator #1:

Basic RF Transmitter for PIR Sensors:

Battery operated FM rebroadcast transmitter : Gives you 10 to 20 meters range and runs for months on a single penlight cell.

Building a Simple LF Exciter:

Compact 20 14 MHz Direct Conversion Receiver:

Design of Brookdale AT Volt Repeater System Exciter: uses a pair of Hamtronics model TA4512-watt narrow-band FM voice transmitters to develop video and audio carriers on439.250 MHz and443.750 MHz

Easy 2 Meter Transmitter: This project is a simple transmitter using only one crystal and will cover 145.00 to 146.00 MHz. The crystal is a 44.9333 MHz crystal for 145.500 receive, as used in the Trio (Kenwood) 2200, PYE, Motorolla, Tait equipment, to name but four. The frequency of the crystal is not critical as almost any other xtal for the 2-meter band will function

FM Band Monaural Transmitter:

FM Radio Transmitter:

FM Radio Transmitter #1:

Four Transistor Tracking Transmitter:

Hear Amateurs on your FM Radio!:

Light Sensing RF Transmitter:

Micro Power FM Broadcasting Circuits:

One Pot to Control Two Channels:

Phasing SSB Exciter:

RF Transmitter, Light Sensing:

Simplest RF Transmitter:

Small FM Transmitter:

T Volt Transmitter:

T Volt Transmitter: allows you to send video to any television in the house, Poptronix kit circuit

Telephone Transmitter:

Three Watt FM Transmitter:

Two Transistor FM Transmitters:

Two Valve 40m CW Transmitter:

VHF / UHF T Volt Modulator: Elektor January1985

VHF FM Transmitter:

VHF Transmitter:

Video / Audio Wireless Transmitter: circuit diagram and project description

Video emitter uses battery power: 08/30/2001 EDN – Design Ideas / The block diagram in Figure 1 shows how to make a cable-free, direct-video system. The system allows users to walk from booth to booth at an exhibition to interview people and to display the interviews in real time on three screens at key locations. You can use the small and simple system each time you need to capture image and sound on the run. .

Video to RF Modulator: This circuit is a RF modulator which can be used for modeling of video signal.

Wireless Microphone #1:

Wireless Microphone Transmitter:
WLW 500KW Transmitter Schematic:

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The circuits below light a 20 watt lamp when the contacts are touched and the skin resistance is about 2 Megs or less. The circuit on the left uses a power MOSFET which turns on when the voltage between the source and gate is around 6 volts. The gate of the MOSFET draws no current so the voltage on the gate will be half the supply voltage or 6 volts when the resistance across the touch contacts is equal to the fixed resistance (2 Megs) between the source and gate.

The circuit on the right uses three bipolar transistors to accomplish the same result with the touch contact referenced to the negative or ground end of the supply. Since the base of a bipolar transistor draws current and the current gain is usually less than 200, three transistors are needed to raise the microamp current level through the touch contacts to a couple amps needed by the light. For additional current, the lamp could be replaced with a 12 volt relay and diode across the coil.

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