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42 Mc Band to 88 Mc Band (retrofit converter) Project – Circuit Schematic
42 Mc Band to 88 Mc Band (retrofit converter) Project
Before World War II the FM radio band was just below 50 Mc. Read all about it. If you have such a radio, you might want to build this converter. It will let ...
40 m Band Direct Conversion Receiver – Circuit Schematic
40 m Band Direct Conversion Receiver
Building a practical and usable direct conversion receiver for the 40 m CW band is not as simple as it might appear. Broadcast station signals from the adjacent...
4 Band Double Tuned Preselector – Circuit Schematic
4 Band Double Tuned Preselector
Once again, this is a project designed by David Sayles. The input can be from a longwire or a loop antenna. The unit covers MW and Sw to 30MHz. Click here for a...
136 kHz direct conversion receiver – Circuit Schematic
136 kHz direct conversion receiver
I describe a simple direct conversion receiver, thinked for QRSS and DFCW communications, as companion of ARGO or SPECTRAN programs. I don`t pretend to beat the...
500KW Transmitter Schematic – Circuit Schematic
500KW Transmitter Schematic
The transmitter was designed with redundancy and cutback (reduced power mode) in mind, giving the transmitter more continuity of service. The final amplifier wa...
VHF/UHF TV modulator – Circuit Schematic
VHF/UHF TV modulator
A 'TV modulator' is really no more than a transmitter. It is a very small transmitter, admittedly, but none the less that is what it is. What does a modulator a...
4-transistor tracking transmitter – Circuit Schematic
4-transistor tracking transmitter
Sorry, I don`t have any data/instructions for use on this schematic. If anyone knows how this circuit works or is used, please drop me an email at click here or...
Small Radio Transmitter – Circuit Schematic
Small Radio Transmitter
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...
Sensitive fm transmitter – Circuit Schematic
Sensitive fm transmitter
This is an image Schematic. No Description available....
simplest rf transmitter – Circuit Schematic
simplest rf transmitter
This is an image Schematic. No Description available....
RF transmitter uses AMI encoding – Circuit Schematic
RF transmitter uses AMI encoding
The circuit in Figure 2 shows a 16-channel, AMI-encoded RF transmitter for data rates as high as 28.8 kbps. The circuit operates in the unlicensed (FCC Part 15)...
RF-telemetry transmitter features minimal parts count – Circuit Schematic
RF-telemetry transmitter features minimal parts count
The circuit in Figure 1 meets these criteria and uses only three off-the-shelf ICs and a few passive components. Although dedicated to conditioning the low-leve...
Miniature MW Transmitter – Circuit Schematic
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 sp...
miniature fm transmitter – Circuit Schematic
miniature fm transmitter
This miniature transmitter is easy to construct and it`s transmissions can be picked up on any standard FM receiver. It has a range of up to 1/4 of a mile or mo...
Micro Power FM Broadcasting Circuits – Circuit Schematic
Micro Power FM Broadcasting Circuits
Here are some utility circuits for use with the Ramsey FM10a, and other small FM stereo transmitter kits. This information may be helpful for setting up a micro...
Low Power FM Transmitter – Circuit Schematic
Low Power FM Transmitter
The circuit of the transmitter is shown in Figure 1, and as you can see it is quite simple. The first stage is the oscillator, and is tuned with the variable ca...
Ham Radio BFO – Circuit Schematic
Ham Radio BFO
Ham Radio (amateur radio) is a popular hobby amongst electronics enthusiasts all over the world. Basically the hobby involves a person in making his own gear co...
FM Transmitter Circuit – Circuit Schematic
FM Transmitter Circuit
L1 is 0.112uH (this tunes to the middle of the FM band, 98 MHz, with VC1 at its centre value of 33pF). L1 is 5 turns of 22 swg enamelled copper wire close-wound...
ATV Repeater System Exciter – Circuit Schematic
ATV Repeater System Exciter
The ATV exciter described here uses a pair of Hamtronics model TA451 2-watt narrow-band FM voice transmitters to develop video and audio carriers on 439.250 MHz...
3-5Volt FM transmitter circuit use two BC547 – Circuit Schematic
3-5Volt FM transmitter circuit use two BC547
This FM transmitter (FM Tx) is about the simplest and most basic FM Tx it is possible to build and have a useful transmitting range. It is surprisingly powerful...