The TL071 operational amplifier makes an excellent foundation for DIY audio compressor circuits. This single-supply design TL071 Audio Compressor offers reliable dynamic range control for musical instruments and recording applications.
Tuesday, 12 May 2026
Audio compressor for microphone
This circuit diagram illustrates an audio compressor for microphone signals. Its primary job is to even out the volume of your voice, making soft sounds louder and loud sounds quieter, resulting in a more consistent and professional audio output. This is incredibly useful for podcasts, voice overs, amateur radio, or any application where microphone levels can fluctuate.
Monday, 11 May 2026
Getting Started with AIS: Track Ships from Your Shack with a RTL-SDR
The Automatic Identification System (AIS) is a VHF radio-based collision-avoidance protocol that virtually every commercial, passenger, and large recreational vessel in the world is required to carry. Since 2004, the International Maritime Organization (IMO) has mandated AIS transponders on all ships of 300 GT or more engaged in international voyages, all cargo ships of 500 GT or more on domestic routes, and all passenger ships regardless of size.
Every few seconds — sometimes as often as every two seconds when a vessel is manoeuvring — its AIS transponder transmits a compact digital burst on one of two dedicated VHF channels: 161.975 MHz (Channel 87B) and 162.025 MHz (Channel 88B). That burst contains a rich data payload: MMSI number (a unique vessel ID), ship name, call sign, IMO number, vessel type, dimensions, draught, destination, navigational status, GPS position, course over ground, speed over ground, rate of turn, and more.
Complete Guide to Budget Software Defined Radio : From $15 Dongles to Serious HF Receivers
Software Defined Radios have quietly rewritten the rules of radio listening. What once demanded a shelf full of dedicated hardware — separate receivers for HF, VHF, UHF, satellite — now fits into a USB dongle the size of your thumb. For hobbyists and shortwave listeners working on a tight budget, that shift is nothing short of revolutionary.
This guide covers the full landscape of affordable SDRs: what to buy at each price point, which software tools matter, and how to avoid the traps that catch most beginners.
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