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QRP VFOs – Circuit Schematic
QRP VFOs
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RF workbench – Circuit Schematic
RF workbench
Focus on measuring low-level, HF circuits with a return loss bridge ” topics such as using the bridge for antenna matching are omitted and readily found on th...
K7LR Memorial Receiver – Circuit Schematic
K7LR Memorial Receiver
This web page is a memorial to Mike Caughran, KL7R, who died suddenly in January 2007. Mike was a passionate experimenter who was embraced by the homebrew radio...
pyro rf transmitter 27mhz – Circuit Schematic
pyro rf transmitter 27mhz
Instead of focusing on the mathematical and raw theoretical side of this simple pyro RF transmitter, we`ll be focusing on the elements in each of the stages. Th...
Simple Pyro RF Transmitter (27 MHz) Circuit – Circuit Schematic
Simple Pyro RF Transmitter (27 MHz) Circuit
The schematic for this project is actually deceivingly simple compared to the complexity of what is happening in the circuit. So take a look below or click to v...
Simple Pyro RF Receiver (27 MHz) - Signal Mixing – Circuit Schematic
Simple Pyro RF Receiver (27 MHz) - Signal Mixing
After the wizardry that is our standard renegerative front-end receiver circuit, we will be able to see some initial output receiver from our transmitter. The p...
Simple Pyro RF Receiver (27 MHz) Circuit – Circuit Schematic
Simple Pyro RF Receiver (27 MHz) Circuit
The schematic for this project flows naturally from left to right. Beginning at the antenna and the regenerative receiver front-end, then flowing through the am...
FM Bug Transmitter Mint Box Circuit – Circuit Schematic
FM Bug Transmitter Mint Box Circuit
Here is the circuit for the FM Bug. In total there are 18 core components that are needed for the fm transmitter to work properly. The far left side has the ele...
Antennas – Circuit Schematic
Antennas
The antenna used for either receiving or transmitting is a vital element in the communication link. In most cases the antenna has a great deal to do with how we...
Vacuum tube tesla coil (VTTC) using Russian GU-81m – Circuit Schematic
Vacuum tube tesla coil (VTTC) using Russian GU-81m
The coil has been added a few extra turns, so I had to find a way to improve the insulation. I opted for epoxy, with some extra quantity added over the solderin...
5 Tube AC/DC Radio Receiver – Circuit Schematic
5 Tube AC/DC Radio Receiver
Virtually all AM radio manufacturers used this exact circuit from about 1948 to 1963 or so. People are starting to collect these radios as antiques of sorts. I ...
Introduction – Circuit Schematic
Introduction
What do you do with those old 2-Meter FM rigs that don`t have any CTCSS tone capability Well, you add it of course! While big knob` tone encoders have been avai...
Circuit explanation of PLL synthesizing oscillator – Circuit Schematic
Circuit explanation of PLL synthesizing oscillator
To change the frequency of the output by the dividing ratio of the comparison frequency in the 10KHz unit, the dividing ratio is fixing on 1024 at the circuit t...
Medium Wave radio reciever circuit – Circuit Schematic
Medium Wave radio reciever circuit
This radio reciever can work with any of the following transistors zn414, mk484 or ta7642....
Q-Switch Driver – Circuit Schematic
Q-Switch Driver
The Q-Switch driver for an old Yag laser died. A replacement was >$1000 so we built our own for = 20W into a 50 ohm load at 68MHz. The rep rate had to be adjust...
Tesla Coil – Circuit Schematic
Tesla Coil
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Coupler Crystal Radio – Circuit Schematic
Coupler Crystal Radio
A two-circuit tuner, as the loose coupler, is one of the only ways selectivity can be accomplished without sacrificing sensitivity. Let`s look at the circuit, s...
Notes on the Wenzel low power AM transmitter schematic – Circuit Schematic
Notes on the Wenzel low power AM transmitter schematic
In many discussions of LPAM transmitter design you will hear or read references to "the Wenzel circuit" or "the Wenzel transmitter. " These refer to the clever ...
rf module interfacing with spartan 3an fpga – Circuit Schematic
rf module interfacing with spartan 3an fpga
The RF module, as the name suggests, operates at Radio Frequency. The corresponding frequency range varies between 30 kHz & 300 GHz. In this RF system, the digi...
Azures Realm – Circuit Schematic
Azures Realm
The main project was to design a frequency-hopping microwave signal generator. Although the device wouldn`t actually modulate any data, it would have to send a ...