Donor challenge: Your generous donation will be matched 2-to-1 right now. Your $5 becomes $15! Dear Internet Archive Supporter,. I ask only. Making a Transistor Radio [G.C. Dobbs, B.H. Robinson] on Hardcover: 52 pages; Publisher: Ladybird Books Ltd (January 27, ); Language. Making a Transistor Radio – Ladybird Book. Making a Transistor Radio Book Cover. Making a transistor radio is a book written by G.C. Dobbs, with illustrations .
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These arc screwed down through the ladybied in the potentiometer tags, trapping the leads under the tags. I say that this book is a must read!
The two large holes are made with a brace and bit and are for mounting the control components. High gain, higher leakage low Vbe transistors, which all tend to go together in any given example can cause the output stage to do a miniature version of thermal runaway and cease to give any output at all. Follow the drawing carefully, adding one component at a time and checking its position on the ritxuii diagram. The 0A91 diodes that I had would have been inserted wrong way around if I’d followed the pictures, which show the ‘red’ end of the transparent 0A91as being the anode.
Mount the screws and screwoups, used for connections, at one inch intervals in two rows of eight. Sandpaper or the rough edge of a matchbox can also be used to dean wires before they are connected.
Passing signals back again like this is called feedback. It worked quite well with screw heads pressing the wires against the plywood. Despite the introduction to soldering inside the cover, the signature construction method used in the book trandistor the use of woodscrews and screwcups on a wooden baseboard.
I had a similar book, Usborne guide to electronics, same format, had several neat projects in it ladybidr I tried building at a young age, definitely solidified my interest in electronics. The illustration also shows how the diode is included in the circuit by means of the sc re we ups. InI think I assumed the boys in the UK did wear white shirts and ties. Definitely was the start of my interest in electronic tinkering. We therefore need some sort of filter — to allow only one radio station to be received at once.
Before you complain that I used the wrong type, the parts list text says that bkok can use any red spot audio transistor.
The book then adds amplification to the crystal set in a series of stages which culminate in driving a small loudspeaker. Don’t try to maaking plywood, MDF, a piece of solid oak from Grandad’s wood shed or any other hardwood type substance as the baseboard.
This sensitivity makes the radio ideal for the medium wave band, which is rather overcrowded. This additional transistor will greatly increase the volume, enough to drive a loudspeaker, which tfansistor the next addition.
Books You Should Read: Making A Transistor Radio
During the building mzking the radio, wires have to be bent into place and sometimes cut to the correct length. This is transistlr on a piece of i inch diameter ferrite rod. My brother and I got large reels of enamelled copper wire to string out to the trees in the garden for aerials.
As an exercise the book takes a brief diversion into home-made radios as created by WW2 prisoners of war with a detector made from a piece of coke. You will also have shared the thrill of thousands of other radio construc- tors, listening to sounds coming from a radio receiver which is your ow n work.
Full text of “MAKING A TRANSISTOR RADIO – LADYBIRD BOOK”
The electro -magnetic audio signal wave is amplified, or made” bigger, and translated from an electrical signal into SOUND by the loud-speaker, from which we hear a repro- duction of the transmitted sound. The tuning should be sharp enough to tune in individual stations without the background sounds of other stations. Obtain some 36 s. It is easy to believe these days that children are shielded from anything that might be remotely practical, for fear that they might hurt themselves.
The transformer we require is the Eagle LT Il is possible to test a connection with the simple battery and bulb arrangement in the diagram. Ladybird Radio Kit Of Parts. A pair of high resistance headphones could be used in place of an ear- piece, and may give even better results. makibg
They give the correct voltages between the collector, base and emitter.