Showing posts with label audio amplifiers. Show all posts
Showing posts with label audio amplifiers. Show all posts
Saturday, November 2, 2024

More Background on the Mythbuster II Rig (and a short video)

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Above is a short clip of me hearing an old friend on the new receiver.  TRGHS.  A couple of guys on Facebook asked for a schematic for thi...
7 comments:
Wednesday, October 30, 2024

Bill N2CQR Builds Yet Another Mythbuster Transceiver

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  This one is for 20 meters (no need for 75) and will go to the Dominican Republic. 6 crystal filter at 5.2 MHz. VFO from old Yaesu FT-101 ...
7 comments:
Friday, September 29, 2023

"The Art of Electronics" #8 -- Why Not a Simple Emitter Follower as The AF Output Circuit?

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Click on the image for an easier read Back when Dean KK4DAS and I were trying to find a suitable AF amplifier circuit for our High School Di...
5 comments:
Sunday, May 14, 2023

SolderBaloney and SolderTruth

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This is so nuts that it actually had me checking to see if this was possibly an April 1 joke.  But alas, it was put out on March 30 and is a...
11 comments:
Saturday, March 25, 2023

Update on the High-School Direct Conversion Receiver Project: Board #4 Completed

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One of the receivers. (l to r) AF, PTO, Mixer, BP filter The students continue to make great progress on their direct conversion receivers. ...
2 comments:
Monday, November 21, 2022

A Homebrew LM386 -- Does Anyone Want to Build It? Help Save Us All from the Indignity of ICs!

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  I recently commented that I was building a discrete LM386 for a Direct Conversion receiver.  I think I was exaggerating my project.  In fa...
8 comments:
Wednesday, April 13, 2022

The 17 & 12 SSB Transceiver -- Circuit and Build Info -- Video #4

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I REALLY LIKE THIS RIG. IT IS LIKE A MAGIC CARPET THAT CARRIES MY VOICE ACROSS THE SEAS. Cutting Display Hole sets off smoke alarm. Revers...
3 comments:
Monday, November 8, 2021

Save $2970! Build this $30 DIY Microphone!

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There are a number of good ideas in this video.  We've known for a long time that many expensive mics are really simple, cheap mic capsu...
4 comments:
Friday, April 30, 2021

Trying to Repair Some Old Gear, He Got Hit with a Dose of LSD!

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Oh no, here's something else for us to worry about when working on old gear.  As if the treat of electrocution or radioactive poisoning ...
Sunday, January 24, 2021

VBE Multiplier Makes KLH Receiver "Cool Running"

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Yesterday I turned to the SolderSmoke wizards for advice on how to fix my KLH Model Twenty-one II FM receiver.   I had finally gotten the th...
2 comments:
Tuesday, May 12, 2020

An Understandable Chip: The LM386

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Over the years I have made my distaste for integrated circuits very clear.  I've presented them as mysterious little black boxes th...
4 comments:
Saturday, December 30, 2017

Building the Ceramic Discrete Direct Conversion Receiver - Part 3 -- The Audio Amplifier

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Once you have achieved JOVO and have the oscillator covering the frequency range you desire, it will be time to build the audio ampl...
3 comments:
Friday, August 18, 2017

Voltage Regulators as Audio Amplifiers - Who Knew!?

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Mike KC7IT pointed out that the AF amplifier chip in my Sawdust regen receiver is actually a TL431 voltage regulator. Mike writes: "I...
2 comments:
Friday, January 27, 2017

When Bypass Caps are Not Enough: Active Decoupling

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I was having a noise problem with my NE602 Si5351 OLED display receiver.   There was an annoying high pitched whine in the audio output.  ...
4 comments:
Friday, December 9, 2016

Great Hackaday Article on the Venerable LM386

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I'm not crazy about chips, but I've come to like the LM386.  It is not really a little black mystery box -- as the article points...