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Switched capacitive audio filter projects - AmateurRadio.com
https://www.amateurradio.com/switched-capacitive-audio-filter-projects/
A little more research on the topic led me to “An Adjustable Audio Filter System for the Receiver” by Lloyd Butler VK5BR (Originally Published in Amateur Radio, March 1995). This is also a “roll your own” project, but gives some detail on the use of the filter in CW, RTTY, voice and other narrow bands.
Filter Circuits
https://www.circuitstoday.com/category/filter-circuits
Filter Circuits – Active Filters. Introduction to Filters An electric filter is a network designed to attenuate certain frequencies but pass others without attenuation. A filter circuit, therefore, possesses at least one pass…. Read More.
Ham Radio Projects - Exclusive Never Before Published!
https://www.hamradiosecrets.com/ham-radio-projects.html
Remember! You stand to save a fair bit of money by home brewing the amateur radio accessories you need. Some examples of feasible projects are: antennas; antenna system impedance matching devices (antenna tuners a.k.a "Transmatch") simple circuits like receiver front-end protection from strong RF signals (see article below)
K4ICY's Home Brew CW Audio Filter - Design / Amateur Radio
http://www.k4icy.com/cwfilter.htm
The circuit used is an active RC driven filter using Op amps and is pre-constructed for a set frequency range. The circuit was inspired from the ARRL Extra Class study manual's (Volume 8) pages on active filters. This device has a narrow pass band that will amplify only a desired range or audio frequencies and reject other that may contain QRM
Ham Radio Projects for Beginners to Amateur Radio
https://www.electronics-project-design.com/HamRadio.html
Ham Radio Projects for Beginners to Amateur Radio. Amateur Radio Operators are often referred to as Ham Radio or simply hams. Each of the hams is given a call sign or station identifiers like WA2DHF, W3ABD etc. after they have passed their amateur radio examination.
Audio Amplifier Circuit - UC Santa Barbara
https://web.ece.ucsb.edu/Faculty/rodwell/Classes/ece2c/labs/Lab%201a%20-%202C%202007.pdf
Use of active filters for tone control ... Week #2: Microphone circuit The audio amplifier project is more difficult and time-consuming than the microphone pre- ... At first glance this project looks simple; all we need is an amplifier to drive an audio speaker,
Simplest AM Radio Circuit - Homemade Circuit Projects
https://www.homemade-circuits.com/simplest-am-radio-receiver-with-speaker/
This filters out the audio element in the signal after D1 detection, and is sent through the R2, L2 stage to the base of TR1. C3 eliminates any form of stray RF. Next is C4, which offers a high impedance to the signal compared to R4, which prompts the signal to move to TR2 base. Audio Amplifier
Speaker Noise Reduction Circuit Add on VE3VDC
http://hamuniverse.com/speakernoisecircuit.html
The circuit, pictured below, is a simple low pass filter that can be added to any speaker and uses only a pair of 50 cent parts. Despite the unusual electronic symbol, C1 is a common non-polarized electrolytic capacitor used mostly in speaker crossover networks. It has to be non-polarized because the speaker is working on alternating current.
vk3ye dot com : Amateur radio projects
https://vk3ye.com/projects/index.htm
Parts needed for electronics and radio construction. The four pieces of radio test equipment you really need. Building projects from the schematic diagram - A one transistor crystal oscillator. Introducing the Pixie Hack Challenge 2. Receiving projects. Induction loop audio receiver (video) A simple crystal set (and Q multiplier)
Simple FET Circuits and Projects - Homemade Circuit …
https://www.homemade-circuits.com/fet-circuits/
A filter network comprising (RFC1-C5-R3) eliminates the RF ingredient from the receiver output circuit, while an additional filter (R4-C6) attenuates the quench frequency. An appropriate 2.4 uH inductor for the RF filter. How to Set Up. To check the superregenerative circuit in the beginning: 1- Connect high-impedance headsets to AF output slots.
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