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TRF
RADIOS
Part 5 More of Augustin's Radio Projects |
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AUGUSTIN'S RADIOS - Continued: . |
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| Augustin
for
Romania
had
kindly
sent
us
some
more photographs of his radio projects. He
writes: "I built it in a larger matchbox, 79x55x34 mm. I'm very satisfied with this radio. I receive loud and clear 2 stations here during the day, but in the night I can pick up more. The schematic it's not mine. Here it is: http://www.mikroelektronika.co.yu/english/product/books/rrbook/chapter3/chapter3g.htm When I built it I found, I guess so, the ideal values for the components. For example, it is very important to use the 100nF capacitor from pin 6 to negative. Without this capacitor the amplifier oscillates. I have a small volume pot but I don't use it. I tuned the volume with the screwdriver at the highest value. If I turn more, the radio oscillates. So, the value of the pot is 50K instead of the 47K pot, I put a 27K resistor. It works perfectly like this. I also didn't use R4. I put just the 47nF capacitor. I have a slide switch to turn the radio on or off. Maybe someone wants to ask me something. I'll be glad to reply, here my email address:  Best wishes, Augustin
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AUGUSTIN STANCU'S ONE VALVE RADIO PROJECT - 2009 |
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 The coil is important as it determines the tuning range. The coil that I used was taken from an old radio. It is about 17cm long and 1 cm thick. The small winding has 7 turns and the larger one has 70 turns. I powered my radio from a 12V-9Ah motorcyle lead acid battery, but I think a dry 12V - 1,2 A will be enough for a few hours of listening....  Photo Left: Augustin's
One
Valve
Radio
Glowing In The Dark!I made a solid state AF amplifier stage for the radio. Although I initially wanted to build an amplifier with germanium transistors, the amplifier section that I eventually settled upon consists of the well known LM386 integrated circuit, using a BC109 transistor as the preamplifier for the LM386. The anode load is provided by a 34K resistor instead of the transformer used in the original one valve circuit. Now I have the perfect hybrid radio: Tube, Transistor and I.C. I even posted a clip on youtube with the sound. People can build this radio as they may like; either for listening with an earpiece or with a loudspeaker speaker so everyone can hear. I think people will like to build a radio that 'glows in the dark' especially because it doesn't need a high anodic voltage. People are always fascinated about matchbox radios and tube radios :-) Best regards, Augustin Stancu. November 2009
Here are the photographs that should explain everything. They say that a picture is worth a thousand words!  Augustin Stancu's One
Valve Radio in its basic one valve form without AF amplifier
 Augustin Stancu's One
Valve Radio in its basic one valve form without AF amplifier
 Augustin Stancu's One
Valve Radio with additional solid state AF amplifier stages added
  Augustin Stancu's One Valve Radio with solid state AF amplifier stage. Above is a video of the working radio. The programme is in Romanian. At that time I had the LF amplifier built with wires (we call it 'spider') for testing. It looks ugly! The sound is better in reality than that produced on YouTube. |
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THE HAC MODEL "T" TWIN TRANSISTOR RADIO KIT The HAC company of East
Grinstead,
Sussex, produced radio kits for home construction radio
enthusiasts and
short wave listeners. The three transistor circuit is
described above,
but Jake Haskell very kindly sent MDS975 photographs of his original
HAC Model "T" Twin Transistor short wave radio instruction booklet.
You can download the PDF file of the HAC Model "T" Twin Transistor Radio Kit instruction booklet HERE You will also need to have a PDF viewer, such as Adobe Reader, installed on your computer - but this is a simple matter. Visit http://www.adobe.com/ to download Adobe Reader. |
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| Link
To More Electronic Projects Visit the EVERYDAY AND PRACTICAL ELECTRONICS Website |
No
AM radio stations or transmitters in your locality or country?
 Has your
local medium wave broadcast station closed or been moved to VHF/FM or
Digital? Don't worry. You can
still build and experiment with crystal sets and TRF radios by
also buying
or even building a simple low power AM transmitter. So, not only can
you use your
crystal sets but you can also run your own radio
station that can be heard in and around your home - playing the music
or programmes that you want to hear!
SSTRAN
AMT3000
Superb high fidelity medium wave AM transmitter kits from SSTRAN.
Versions available for 10kHz spacing in the Americas (AMT3000 or
AMT3000-SM) and 9kHz spacing in Europe and other areas (AMT3000-9 and
AMT3000-9SM). Superb audio quality and a great and well
designed little
kit to build: http://www.sstran.com/pages/products.html
 http://www.sstran.com/ Other AM transmitters available:
Spitfire
& Metzo Complete, high quality ready built medium wave AM
Transmitters from Vintage Components:
http://www.vcomp.co.uk/index.htm Vintage Components offer a choice of the high quality Spitfire and Metzo transmitters: SPITFIRE AM Medium Wave
Transmitter with 100 milliwatt RF output power:
 METZO AM Medium Wave Transmitter with built in compressor:  AM88 LP A basic AM transmitter kit from North County Radio. http://www.northcountryradio.com/Kitpages/am88.htm |
T.R.F. RADIOS PART 1
T.R.F. RADIOS PART 2
T.R.F. RADIOS PART 3
T.R.F. RADIOS PART 4
T.R.F. RADIOS PART 6
T.R.F. RADIOS PART 7
LINKS to Other Great Websites
RESISTOR COLOUR CODES
AND CAPACITOR CONVERSION TABLE
T.R.F. RADIOS PART 2
T.R.F. RADIOS PART 3
T.R.F. RADIOS PART 4
T.R.F. RADIOS PART 6
T.R.F. RADIOS PART 7
LINKS to Other Great Websites
RESISTOR COLOUR CODES
AND CAPACITOR CONVERSION TABLE
LINKS
More TRF Radio Websites:
Gilbert Davey's Radio Sets - A growing resource for all who either remember building radio sets to his designs or would simply like to find out more: http://www.daveysradios.org.uk
Vintage Radio - TRF Radio Designs: http://www.vintageradio.me.uk/radconnav/transtrf/
Vintage Radio - Home Page: http://www.vintageradio.me.uk/
Vintage Radio - Circuit diagrams for crystal sets, TRF and superhet radios, valve and transistor designs:
http://www.vintageradio.me.uk/radconnav/radcon.htm
TRF Designs on Birmingham Alabama Crystal Radio Group: http://www.crystalradio.us/1adradios/1ad-2007-2.htm
Owen Pool's Crystal Radio Resources - featuring some TRF radio circuits: http://bellsouthpwp2.net/w/u/wuggy/
Owen Pool's Audion TRF Radio: http://bellsouthpwp2.net/w/u/wuggy/audion.htm
Regen Radio Tutorial N1TEV : http://www.electronics-tutorials.com/receivers/regen-radio-receiver.htm
Coil Calculations: http://bellsouthpwp2.net/w/u/wuggy/coils.html
E.P.E. Everyday and Practical Electroncs Magazine: http://www.epemag3.com/
More TRF Radio Websites:
Gilbert Davey's Radio Sets - A growing resource for all who either remember building radio sets to his designs or would simply like to find out more: http://www.daveysradios.org.uk
Vintage Radio - TRF Radio Designs: http://www.vintageradio.me.uk/radconnav/transtrf/
Vintage Radio - Home Page: http://www.vintageradio.me.uk/
Vintage Radio - Circuit diagrams for crystal sets, TRF and superhet radios, valve and transistor designs:
http://www.vintageradio.me.uk/radconnav/radcon.htm
TRF Designs on Birmingham Alabama Crystal Radio Group: http://www.crystalradio.us/1adradios/1ad-2007-2.htm
Owen Pool's Crystal Radio Resources - featuring some TRF radio circuits: http://bellsouthpwp2.net/w/u/wuggy/
Owen Pool's Audion TRF Radio: http://bellsouthpwp2.net/w/u/wuggy/audion.htm
Regen Radio Tutorial N1TEV : http://www.electronics-tutorials.com/receivers/regen-radio-receiver.htm
Coil Calculations: http://bellsouthpwp2.net/w/u/wuggy/coils.html
E.P.E. Everyday and Practical Electroncs Magazine: http://www.epemag3.com/
Home | Contact | Site Map | Links | Thank You | Radio Stations & Memorabilia | Amateur Radio