Bench AF Amplifier. Schematic Diagram.
The circuit… This circuit consists of just a few discrete components and one common IC amplifier – the LM380N. It’s simple, cheap, quick to build and works well. I built mine in a steel,...
The circuit… This circuit consists of just a few discrete components and one common IC amplifier – the LM380N. It’s simple, cheap, quick to build and works well. I built mine in a steel,...
Boom Length – 1651 mm Distance between: Between Distance, mm R – V 432 V – D1 330 D1 – D2 406 D2 – D3 483 Dimenson of elements: Side, mm Diagonal, mm Perimeter,...
I needed a small dummy antenna for testing my Elecraft K2. It was to be small and capable of being used into the VHF range. It had to have a BNC connector, and it...
This preamplifier for a high impedance microphone was built into a Harris limiter/compressor which needed a line-level input. Its response is essentially flat from 20Hz-30KHz. The 10uF capacitors are 25v Tantalums, the .01uF capacitors...
Dig out that old microwave oven transformer you’ve been saving and take a look in your junk box. It’s time to build that battery eliminator you need for the mobile rigs. Although the transformer...
This little circuit is a copy of a design which was built around twenty years ago. The heart of the unit is based around a 723 regulator chip. It has variable voltage and current...
This circuit is based around mixer/oscillator IC2. A 50mHz signal is fed to pin1 input of IC2 and mixed with the local oscillator injected at pin7. The resultant output is the antenna frequency minus...
The Icom HM-36 microphone is a simple electret mic. But many owners notice that some microphones sounds bad. What reason? There are two different types of ICOM microphone HM-36 (exclude chinese fake): First type...
This is the first tower I built. After moving here, the idea occurred to me that trees can save a lot of money and work when it comes to towers. Trees are already firmly...
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