Circuit6040's channel

Describing and testing a BITX40 7 MHz SSB transceiver that largely copies the famous design by Ashhar Farhan VU2ESE.

I'm out portable on a hot a...

Homebrew Superheterodyne 80m Ham Radio receiver featuring hand-wound I.F. and BFO coils. An excellent learning tool, fashioned after the 1932 QST ...

1978 Electrolux Olympia 1 Vacuum Cleaner with Power Nozzle

The Secret Life Of Machines - The Radio. Tim Hunkin and Rex Garrod Take you through the workings and history of the radio.

This video covers the history of the discovery of radio waves, to the creation of simple oscillator based radio transmitters. Then I explain what m...

Different ways you can protect your circuit from backwards power connections. Diodes, schottky diodes and P channel MOSFETs.

A tutorial on passive RC high pass filters. You can use them to filter out low frequency signals, or remove DC offsets from a signal.

Make sure yo...

Afroman goes over the basics of how to use an operational amplifier to amplify tiny voltages, and builds a circuit to listen to very faint sounds w...

The UA 741 (mother of all Opamps) is used as comparator here. This practical circuit can be used as level indicator, automatic battery charger, et...

A circuit perhaps interesting for people that like audio effects and distortion effects. The music or speech signal is broken intio pieces by a Wie...

The nerdkit's great! Hey, check out part one if you hadn't already: http://www.youtube.com/watc...

To passionate chefs, cooking is an art. Knowing exactly when a cut of meat is cooked to perfection requires knowing your meat and your grill. But w...

I just got my NerdKit in the mail, and I put together the first project. It looks really great so far. I've done programming for a number of years ...

An Evening with Martin F. Jue: MFJ's Antenna Analyzers

Part 2 of 3 on Antenna Analyzer Product Line

at Ga Tech, February 25, 2010

Hosted by the Atl...

14 MHz Double Tuned Circuit Simulation with GPLA

General Purpose Ladder Analysis from EMRFD software

Experimental Methods in Radio Frequency Desig...

http://quazar31.home.comcas...

Ratio Detector

10.7Mhz Three stage IF

One stage antenna filter.

Automatic Gain Control.

http://quazar31.home.comcas...

AM/FM AGC Balanced AFC

AM

Diode Detector

455Khz IF three stage.

One stage antenna filter (loopstick)....