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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Covers were almost the same but inside drawings were black and white.
Books You Should Read: Making A Transistor Radio
IGuF tS volts, working efecirolytsc capacitor. They give the correct voltages between the collector, base and emitter. You will also have shared the thrill of thousands of other radio construc- tors, listening to sounds coming makinb a radio receiver which is your ow ladybirrd work.
For me it was the Usborne Guide to Audio and Radio, which also featured a build-it-yourself radio. The illustration also shows how the diode is included in the circuit by means of the sc re we ups. It can operate transistof on its own as a radio receiver, even if no further stages are added. Jt is still something to marvel at — and a fascinating subject to study.
All the popular electronic construction magazines contain advertisements for mail order supplies.
The transformer we require is the Eagle LT Adding regeneration The circuit shews the new stage with the components added. A loudspeaker changes electrical waves into sound waves in the same way that an earpiece does, but it has a large cardboard cone so that several people can hear the sound. In fact, my first electronic circuit.
MAKING A TRANSISTOR RADIO – LADYBIRD BOOK
J Make sure the wire to be connected is scraped dean until il shines. The circuit board is used as a front panel, and tdansistor and bottom panels are added. The final stage does not suffer in the same way, partly due to it operating in a transformer coupled class-C fashion, where the stored energy in the inductance provides half of the output swing. Do you still have your radio?
It would be interesting to see how easily a contemporary version of the book could be created, with silicon transistors, Schottky signal diodes, and a polyvaricon to replace the Jackson Dilecon variable capacitor. Most of these can be found in a normal household toolbox or are inexpensive to buy.
The reader is introduced to these, and the tools the might have to master, before being shown the measurements for the board.
When you open the book, the first thing you see sets the tone, for there is a guide to soldering on the inside of the front cover. Don’t try to use plywood, MDF, a piece of solid oak from Grandad’s wood shed or any other hardwood type substance as the baseboard.
The bottom panel is the same size as the circuit board and the measurements for the end panels arc shown opposite. While making up this kit I found some other interesting things to do with the substitute parts list which is in the back cover of the book.
Sometimes this is not obvious, but follow the circuit and layout diagrams with care to avoid mistakes. It consists of two plates which arc separated by insulating material; the circuit symbol shows this.
O yrigb if cmw making a Transistor Radio by G. I suspect the problem with transistor beta rdaio above may have played a part, but I never even got mine to whistle. Again, the reader is not talked down to, being introduced to all the useful things you need to know if you are to maintain an interest in radio. One end is marked either with a red band or a H sign, vook this side goes to the positive side of the circuit. Using an OC71 here ensures that this shouldn’t happen as there is some inherent emitter resistance and lower gain anyway.
Touch the two leads onto some of the bare wire either side of the connection. It certainly tought me one thing about how to make a transistor radio, that being one specific method which, try as I might, I could not get to work. The near end of the wire may be taken in the top of an upstairs window and connected to the aerial connection boko our radio.
Books You Should Read: Making A Transistor Radio | Hackaday
Loudspeakers are made with inputs of varying resistances, and our radio requires a 3 or 5 0 type. The book is now in the loft, rather shabby and written on, in my childish scrawl. Our radio can use makng or any tolerance, so this band may be ignored. If you really want to make one of these for nostalgic reasons I’ve made up some kits of all the parts excluding softwood here: This was a ttansistor later mid s ladyybird I seem to remember the design used a ZN The two large holes are made with a brace and bit and are for mounting the control components.
We require lOgF al a working voltage of [6-volts. All are obtainable from your local iron- monger. A transistor can be damaged unless the correct leads are used when connecting it into a circuit. Not all the screws are used in building the first part of the radio; the additional screws are needed later as the radio is completed. If tftrs is so, remake the joint.
W, radio During the ladybord war, some prisoners in prison tamps used home-made radios to keep in touch with events in their native Sands, Oftenail the components had to be made from oadybird picked up within the camp. Or perhaps an AM radio is no longer enough to capture the imagination of a child.
This is done to adjust the voltages and flow oT current at various places in a circuit. A circuit diagram transidtor like a map. Take care to connect up the circuit as shown in the drawing. Unscrew the trimmer until the noise just stops, and try to tune in a station. This one was published at the start of the s when Ladybird books were in their heyday, and has the simple objective of taking the reader through the construction of a simple three transistor radio.
If a transistor is to be used effi- ciently. I was probably about 8 when I got my copy in the early Seventies. The negative — wire is connected to the metal can which forms ihe body of the capacitor, mqking which may biok marked with a black band.
These were well known for failing, even when “new” with internal crystalline growths shorting out to the can, so maybe that was my problem.