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Radio Glen Transmitter – Circuit Schematic
Radio Glen Transmitter
This document describes the transmitter system supplied to Radio Glen for testing as designed and constructed by Henry. The transmitter is supplied in prototy...
AM Radio – Circuit Schematic
AM Radio
A MW AM radio like those you buy, or used to buy. Use just BC549 trannies, with the BC559 complement being allowed in the audio output stage. Buying RF antenna ...
Old German radio with Tubes – Circuit Schematic
Old German radio with Tubes
The Nora K5W is a German radio from about 1929/1930. Is uses the tubes: 2x REN804, 2x REN1004, RE134 or RE604, RGN1054....
CW Radio with Tubes – Circuit Schematic
CW Radio with Tubes
For this radio, which I repaired for someone, I made this DIY VL1. Later I found the real tube....
V.F.O. for H.F with PLL – Circuit Schematic
V.F.O. for H.F with PLL
This project arises from the need to home-build a valid tuning control for a multi band transceiver. It consists of a partial syntesis V.F.O. that fits to sing...
Transceiver for 20 m band – Circuit Schematic
Transceiver for 20 m band
The transceiver is composed by three single sided printed boards 100x70 mm, theese may be stacked so as to reduce the overall size of the metal cabinet. I sugg...
40 meters CW Transceiver – Circuit Schematic
40 meters CW Transceiver
This project describes a little QRP transceiver full legal power” (5 W at 12 V) for the 40 meters band. The RIG may be built in a gradual manner, in fact it ...
HF phone rig for 20-40 meter band – Circuit Schematic
HF phone rig for 20-40 meter band
A simple project, within most of homebrewers capabilities. Very simple tuning, a single stage to align, besides VFO frequency adjusting. Easy to find, cheap com...
800 MHz Cellular Phone Jammer – Circuit Schematic
800 MHz Cellular Phone Jammer
This is a simple little 800 MHz band cellular phone jammer which can be easily built from commonly available parts. Most homebrew cellular phone jammers are ba...
Phone Jammer linear amplifier – Circuit Schematic
Phone Jammer linear amplifier
RF Power Amplifier 1 Watt. Jams Cellular Downlink Band: 800-950 MHz....
High power Valve Russian Jammers – Circuit Schematic
High power Valve Russian Jammers
These photos were made in the years 1956 and 1957. On photo nr. 3, on the right, at the bottom, is the GMD. The work that was done at the objekt was of course t...
Variable GPS Jammer – Circuit Schematic
Variable GPS Jammer
A low cost device to temporarily disable the reception of the civilian coarse acquisition (C/A) code used for the standard positioning service (SPS) on the Glob...
RF Dummy load – Circuit Schematic
RF Dummy load
The load described here is capable of handling up to 10 watts of RF power for a couple of minutes, and is designed for the widely used 50 ohms impedance. It con...
Crystal Filter – Circuit Schematic
Crystal Filter
n the view of the dramatic drop in the price of crystals used in color TV sets, they now represent an economical way of building an SSB filter. The circuit show...
HAM Modulation Monitor – Circuit Schematic
HAM Modulation Monitor
Modulation Monitor is a simple and useful circuit for hams. You can listen to on air transmission from your rig and be sure about the quality of the transmissio...
RF probes – Circuit Schematic
RF probes
An RF probe is used to directly measure the level of RF voltage present at a particular point and is one of the most useful test instrument in the hands of the ...
5W PLL FM Transmitter (PIC16F627A) – Circuit Schematic
5W PLL FM Transmitter (PIC16F627A)
The transmitter includes RDS/SCA input and Audio/MPX input with optional preemphasis. It can be used with or without stereo encoder. Tuning over the FM band is ...
3 Watt FM transmitter – Circuit Schematic
3 Watt FM transmitter
Connect two 24 V / 3 W bulbs in parallel to the output and set the right frequency on PLL. Now turn on the transmitter. You should tune it on a receiver. Maybe ...
Stereo Encoder for FM transmitters – Circuit Schematic
Stereo Encoder for FM transmitters
This stereo encoder is a halfway between analogue and digital processing. It combines the best from both domains to provide high-quality and easy to build devic...
FM radio circuit – Circuit Schematic
FM radio circuit
Two conventional amplifier stages built with SF215 transistors are linked by ceramic 10.7MHz IF filters, and followed by an FM demodulator built with a TBA120T ...