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Miniature MW Transmitter
Here is a very simple, inexpensive and interesting project which provides lot of fun to a home experimenter or hobbyist. This simple transmitter can transmit speeches or songs within a short range. The circuit uses only one transistor. The entire...
Remote control transmitter circuit
The circuit composition of a specific remote control transmitter is illustrated in a diagram. The transmitter primarily consists of a large-scale integrated circuit chip (D1, THBT-T01), a 4.5 kHz crystal oscillator, a 32 kHz crystal oscillator, a liquid crystal display...
Antennas for HAM transmitters
Antenna is the means by which a wireless operator puts his signal into the space and also through which he picks up the signals of the stations with which he wants to communicate. Hence after having a good Receiver and...
an active whip receiving antenna
In the pursuit of effective small antennas, an active whip antenna was constructed. This compact vertical antenna is linked to a preamplifier, which serves to convert the high impedance of the 50-ohm receiver and coaxial cable. Various designs exist for...
Rf power meter
The reflectometer (SWR power meter) operates across three decades, ranging from 100 kHz to 100 MHz. It can be designed to handle RF power levels as low as 500 mW and up to 500 watts.
The reflectometer, also known as a...
Wide Dynamic Range Field Strength Meter
A field strength meter is a useful tool for locating a transmitter. However, a sensitive field strength meter has limitations: it responds to nearly any RF signal entering its input. This characteristic reduces the effective sensitivity of the field strength...
Conversion Receiver For 160 To 20M Circuit
Note that T1 and T2 are TOKO components, including part numbers for the coils T1 and T2. The direct-conversion receiver shown utilizes a double-tuned input network made from readily available TOKO coils. IC1, an NE602, serves as a voltage-controlled oscillator...
Simple Low-Frequency Receiver
Using an NE602 heterodyne detector and U1 as an RF amplifier, this receiver tunes the middle portion of the low-frequency spectrum from 150 to 250 kHz. U2 is a loudspeaker amplifier.
The described circuit employs an NE602 integrated circuit as...
6 Channel RF Remote Control
This project creates a simple but valuable wireless remote controller. It has as many as 6 channels (a rare feature for remote control devices) and transmits encoded MM53200, UM3750, or UM86409. Of course, you can omit the button and make...