MDS975 logo
TRF RADIOS
Part 5
More of Augustin's Radio Projects
MDS975 logo
Home  |  Contact  |  Site Map  |  Links  Radio Stations & Memorabilia   |  Amateur Radio

Back to TRF RADIOS Part 1
Back to Home Page Back To Home Page
Radio, Stations & Memorabilia Crystal Sets Crystal Sets
Resistor Codes & Capacitor Conversion Tables Riding On A Wave All About Radio Waves


AUGUSTIN'S RADIOS - Continued:
.
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:

Augustin's address
Best wishes,
Augustin

augustin's radio in a matchbox

augustin's radio in a matchbox
augustin's radio in a matchbox

augustin's radio in a matchbox


Below:  Augustin informs us that a kind gentleman from the USA sent him some matchboxes, so the radio is now housed in a "Grants Cabin" matchbox.
augustin's radio in a matchbox

augustin's radio in a matchbox



AUGUSTIN STANCU'S ONE VALVE RADIO PROJECT   -   2009



Augustin Stancu's 1 Tube Radio Circuit Diagram
Here is my one tube radio project. Somebody gave me the schematic, he said that he'd copied the schematic from a kit he bought and then improved it. It is very simple and can be built very fast. I improved it even more adding an audio amplifier. After testing the radio I may even make a nice wooden box for it. The radio is working on the Medium Wave AM, but with another coil, it can also receive the Short Wave.

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....

Augustin Stancu's One Valve Radio glowing in the darkPhoto 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 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 additional solid state AF amplifier stages added

Augustin Stancu's One Valve Radio with additional solid state AF amplifier stages added.

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.





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.


Link To More Electronic Projects

Visit the EVERYDAY AND PRACTICAL ELECTRONICS Website




No AM radio stations or transmitters in your locality or country?

http://www.vcomp.co.uk AM Medium Wave Transmitter from Vintage Components

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

SSTRAN AMT3000 low power AM medium wave transmitter
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:
Spitfire AM transmitter from Vintage Components

METZO AM Medium Wave Transmitter with built in compressor:
Metzo AM Transmitter fromVintage Components




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




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/


Visit my Amateur Radio pages . . . .
Visit my Amateur Radio Pages >



^top of page


Home  |  Contact  |  Site Map  |  Links  Thank You  Radio Stations & Memorabilia   |  Amateur Radio

Mike Smith  -  www.MDS975.co.uk © 2005 - 2013


BRMB Radio Birmingham
ILR Birmingham
Independent Local Radio
Birmingham 96.4 FM BRMB
Les Ross - Tony Butler - George Gavin - BRMB Radio Birmingham 96.4 FM - 94.8 FM - 261 metres medium wave