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Sampling RF Power – Circuit Schematic
Sampling RF Power
Perhaps you might want to provide a little ALC feedback to your driver, or use signals from a directional coupler to drive power monitors or SWR lockout circuit...
W3HWJ Radio Receiver Projects – Circuit Schematic
W3HWJ Radio Receiver Projects
The logical first choice was to start out with simple regenerative circuits. Just one or two transistors and maybe a simple audio amplifier using one integrated...
Understanding the WB5LUA GaAsFET Bias circuit – Circuit Schematic
Understanding the WB5LUA GaAsFET Bias circuit
WB5LUA described GaAsFET preamps for several microwave bands which included an active bias circuit for the GaAsFET. Many devices have come along since then whic...
IC-756 Pro III on AM – Circuit Schematic
IC-756 Pro III on AM
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Amateur Radio Projects – Circuit Schematic
Amateur Radio Projects
It took sometime to develop this interface for Echolink. It uses PIC16F84A and accepts external DTMF from Radio. My Latest Version Foxecho-k7 provides total iso...
An B3CKS beer can VLF Antenna – Circuit Schematic
An B3CKS beer can VLF Antenna
So there is a chance to use them in combination with a condenser microphone amplifier for a VLF Receiver. Bingo. The first tests as a Monopole gave good results...
DZ-2 CRV-46152 Aircraft Direction Finding Equipment – Circuit Schematic
DZ-2 CRV-46152 Aircraft Direction Finding Equipment
The DZ-2 was built by RCA, Camden NJ, for the U. S. Navy for use in naval aircraft as a Radio Direction Finder. With a contract date of June 30 1939, the receiv...
Transistor Radio Output Stages – Circuit Schematic
Transistor Radio Output Stages
The driver stage works in the same manner as the class A output stage described previously. However it is only working at a couple of milliamps, so efficiency i...
Bush VHF90 – Circuit Schematic
Bush VHF90
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RF Signal Generator – Circuit Schematic
RF Signal Generator
This signal generator is intended for realignment of radio receivers. The unit is cheap and fairly basic, but perfectly adequate for its intended purpose. Howev...
Electronic Transformers Modulation – Circuit Schematic
Electronic Transformers Modulation
Wave-filter principles are applied in many circuits other than filters. An example is the design of modulation transformers for high-level amplitude-modulated r...
Linear-Circuits in U.H.F. Oscillators – Circuit Schematic
Linear-Circuits in U.H.F. Oscillators
The use of a quarter-wave parallel-wire line as a tuning unit has been discussed in the chapter on Short-Lines, where it was pointed out that these " circuits "...
U.H.F. Receivers – Circuit Schematic
U.H.F. Receivers
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VCXO Boards – Circuit Schematic
VCXO Boards
Many versions of VCXO`s this is the final version I have decide to use in all VCXO`s in the Future, it is extremely universal at all Freq. up to 7th Ovetone XTA...
pll circuit – Circuit Schematic
pll circuit
This page will be updated as Material becomes available. This New System will essentially replace the original BCD Design originally designed by WB6IGP and N6IZ...
RF Signal Generator circuit – Circuit Schematic
RF Signal Generator circuit
This signal generator is intended for realignment of radio receivers. The unit is cheap and fairly basic, but perfectly adequate for its intended purpose. Howev...
UV-3R – Circuit Schematic
UV-3R
These versions are the original UV-3R, the UV-100, UV-100 MKII, UV-200, UV-200 MKII, UV-3R MKII, UV-3R+, UV-5R, and the UV-5R Plus. KYD (China New Century (Quan...
Two Homing type Direction-Finding – Circuit Schematic
Two Homing type Direction-Finding
The antenna is simply a pair of vertical dipoles. The diodes in each dipole allows the circuit to select which antenna is active at any given time. When a posit...
FM Broadcasting – Circuit Schematic
FM Broadcasting
Metal enclosure, forget the plastic case they sell, it`s nearly useless. ( I made a box from copper PCB that I soldered together, it works okay, but could be be...
Block Transistor Radio – Circuit Schematic
Block Transistor Radio
If you prefer a version that is quicker and easier to build, but which doesn`t have quite the same final appearance I highly recommend the Breadboard Six Transi...