I was able to pick up the podcast with excellent audio quality. It is quite true that regenerative receivers are very much in use even today... for example many if not all of the automobile RF keys opening and closing the cars doors rely on a superregenerative receiver circuit !!!
The radio that you copied at the blog works very well indeed but it would be good idea to include a 5 kilo ohms volume control.... Very easy to do indeed.
But let me tell you that my favorite regenerative receivers are the classic ones, using vacuum tubes, and operating them at voltages not higher than 50 volts... As a matter of fact many tubes work very well at the 24 volts DC voltage level. Using the classic Hartley circuit , there is no need for a hard to find throttle capacitor required by the Armstrong circuit, because the regeneration control works very well by using a potentiometer to change the screen grid voltage of the detector.
I agree that using an RF stage ahead of the detector is always a very good idea.... In my tubes regenerative I use a triode connected 6AK5 clone.... as a grounded grid stage....another 6AK5 clone ( the 6ZHE1P Russian tube ) is the detector and I use another 6AK5 clone as the first audio amplifier then feeding an audio output pentode all provided from a very simple basic 70 volts DC power supply. BTW, using regulated DC on the filaments of the detector stage, although a luxury by my standards is very helpful to reduce hum .... 7805 regulator recycled from a bad motherboard, with one 1N4007 from broken Compact Fluorescent Lightbulb inserted in series with the regulator ground pin, produces a nice 5.7 volts regulated DC that with a brand new tube is more than enough... with old 6ZHE1P recycled from Russian TV sets, you add another 1N4007 to obtain 6.4 volts regulated DC....
As said in the podcast, it is very important to do a very good mechanical engineering job, place the main and bandspread tuning capacitors away from the front panel, use isolated shafts between the capacitors and the dial mechanism and make the front panel of a a thick steel plate if possible.
There is a Dutch Cascode Regenerative radio that several Cuban radio amateurs have built... it was designed with the amateur bands in mind so the information about the tuning coils and capacitors lets you obtain a very excellent bandspread on the ham bands. I can send you that circuit that uses very common 12AT7-ECC81 and Russian equivalent double triodes.
Keep up the good work amigo and always tell us when the next podcast is available. BTW it lasted for almost an hour !!!
73 and DX
Your amigo en La Habana, Cuba Arnie Coro CO2KK Host of Dxers Unlimited radio hobby program Radio Havana Cuba
In response to popular demand, "SolderSmoke -- Global Adventures in Wireless Electronics" is now available as an e-book for Amazon's Kindle.
Here's the site:
For the print version:
For shipping from a printer in the U.S. (probably better for N. American buyers) Click here: SolderSmoke USA Version
For shipping from a printer in the UK, Spain, or the USA (probably better for UK and other European buyers)
Click here: SolderSmoke EU Version
The two versions are identical, except for a minor difference in the paper used. That's why the prices are a bit different.
Bill's OTHER Book (Warning: Not About Radio)
Click on the image to learn more
W4HBK's QRSS Grabber: The Amazing Pensacola Snapper (Live!)