Tag " home made"
07
Dec
During World War II, GIs in the field built really amazing simple radios to listen too. These were made with materials that they could get their hands on and were small enough to carry around in a big pocket. You can modify this design if you want to set it up so that it's tuneable too!
httpvh://youtu.be/skKmwT0EccE
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24
Nov
This is a simple add-on adapter for any Family Radio Service (FRS), amateur, or two-way radio transceiver with a microphone/Push-to-Talk (PTT) and external earphone/speaker interface. It will turn the transceiver into a co-channel jammer. That is, a jammer which can only jam a single frequency upon the detection of any "activity" on that particular frequency. This type of circuit is also commonly...
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01
Nov
Static Bleeder for Any Antenna
by Phil Salas – AD5X
Many antennas don’t have a means of bleeding off static build-up. This includes the popular Hustler BTV-series of verticals, dipoles without transformer-type baluns, and many other antennas. While this is typically not much of a problem, I am always concerned about possibly damaging my antenna analyzer when I first connect it to an antenna....
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03
Oct
Did you ever want to upgrade your bread-boarded circuits to something more permanent? Or maybe you've got a hankering to make your own metal Jelwery? Today Sylvia will show you how you can do both with super simple copper etching. More info: http://wp.me/p1CIX9-tbq
httpvh://www.youtube.com/watch?v=lxRNQbEGwm4
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27
Sep
The ‘Retro-75’ 75/80 Meter AM Transceiver board kit & The ‘Retro-40’ 40 Meter AM Transceiver board kit
This project is a frankly nostalgic look back at our hobby of 50 years ago. It’s now been updated using all modern components.
Features:
Board size 3.5” x 5.27”
Tunable Receiver- 50 kHz, selectable, varicap-tuned
4 kHz receiver crystal filter
Room-filling speaker...
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15
Sep
A digital voice recorder circuit that used for voice recording and stored inside the IC. This circuit can keep the voice recording for approx. 100 years without power supply and repeat recording up to one million times.
Technical specifications:
- Power supply : 3-6VDC.
- Consumption : 120mA max. @ 6VDC.
- Recording time : 20-60 sec.
- PCB dimensions : 2.86 x 1.64 in.
How to work:
The...
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13
Sep
TrxAVR-Picastar provides an alternative controller and user interface for a Picastar Transceiver.
Picastar is a outstanding HF transceiver designed by Peter Rhodes, G3XJP.
Picastar construction information, software and setup and operational instructions are
available on G3XJP's Picaproject Yahoo Group.
The support group for Picastar is the Picastar-users Yahoo group.
The support group for TrxAVR-Picastar...
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24
Aug
The WBR – A Simple High Performance Regen Receiver for 40M by N1BYT.
Photo by AA7EE
A few weeks ago when a sizable order of parts arrived from Dan’s Small Parts And Kits, the plan was to use them (along with the parts from a few smaller orders from kitsandparts.com and Mouser) as the basis for some fun home-brew projects. I got my feet wet by building some small circuits Manhattan style – an audio...
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15
Aug
My kids are learning Morse code this summer, so I threw together this little circuit to help them learn. And to make it more fun...
It uses an ATtiny85 ($2.26 at digikey.com) to drive a piezo beeper (≈ $3.50 at Radio Shack.) The ATtiny85 takes 5.5V max, so I built the circuit on a piece of strip-board so as to fit onto the back of a 3-AA-cell ($3 or so at Radio Shack) battery pack.
To program...
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27
Jun
Big boys - Big Power. The 3CX15000A7 amplifier 3-23 MHz. 25 kW SSB output.
Photo: w8ji
LINK
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