Transistors

Transistors - What can be done with a faulty transistor?

Reading time: 2 minute

Author: George D. Oprescu
Publisher: Tineretului - Bucharest
Collection: Skillful hands
Year of publication: 1962

Did you know that ...? Since the year of the first transistorized receiver (1954, in the USA and 1956 in Europe), was the trend of production and use of tube radio receivers decreasing drastically, especially in the West?

La Electronics - Bucharest the production of transceivers with transistors started in 1959 with an insignificant number, in the following year producing 1992 pcs., and in 1961 - 49835 pcs.

What does the book present?

Dear radio amateurs, the purpose of this paper is to put in your possession a basic technical documentation for the construction of transistor receivers, to improve your electronics, and not to make you spend unnecessarily and to discourage you.

It is good to know from the beginning that the transistor is also a defective part, especially when you do not know it. If you give it the attention it deserves, it gives you maximum efficiency. The modern radio amateur no longer boasts, as in the past, how many "lamps" burned was chosen from the installations made, but with the number of correctly executed installations.

Do not make the reprehensible mistake of trying to build a complicated receiver with many transistors, as long as you are not used to working with this part. Pay special attention to the schemes with many transistors that seem simple at first sight! Don't forget: "hurry spoils the job"!

If you want to make a device with transistors, please read carefully all the work from the first to the last tab and only then start experimenting with the simplest assemblies. We know you won't stop there. But they will teach you interesting things, phenomena that can only be understood through practice.

Do not make the unforgivable mistake of going straight to the construction of a complicated assembly, just because you are in possession of all the necessary parts - you will destroy them without result. Do not forget that the acquisition of any technique or qualification is obtained only through sustained work.

A tip: do not limit yourself only to this work. Read everything you find in the literature! Many issues have not been addressed in this paper, in order to simplify it.

We consider, however, that if the paper will make you make a transistor receiver yourself and teach you to orient yourself in the literature, then its purpose is achieved. Increase work!

The structure of the book

CHAPTER I - DEAR YOUNG RADIO AMATEURS - NEW ELEMENTS IN ELECTRONICS

The transistor and the diode
Transistor parameters

CHAPTER II - HOW TO MOUNT THE TRANSISTOR

Transistor mounting systems
Be careful when mounting the transistors!
Assembly and assembly methods
About the notations used and some other tips

CHAPTER III - PARTS OF ASSEMBLIES WITH TRANSISTORS

Coils with iron core
Miniature transformers
Miniature electrolytic capacitors
Coupling capacitors
Semi-adjustable capacitors (trimers)
Miniature variable capacitors
Resistant miniature
Miniature potentiometers
Micreceiver boxes
Construction of miniature speakers

CHAPTER IV - AND NOW AT WORK!

Single transistor receivers

CHAPTER V - AMPLIFICATION STAGES

Audio frequency amplifiers
Radio frequency amplifiers

CHAPTER VI - RADIO DEVICES WITH MORE TRANSISTORS

Receiver with two transistors
Reflex mounting with two transistors
Reflex mounting with three transistors
Receiver with "npn" and "pnp" transistors
Receiver with four transistors
Cascod mounting
Receiver with five transistors

CHAPTER VII - SUPERHETERODINE RECEPTORS

A little theory
Some tips
Superheterodyne with a transistor
Superheterodyne with four transistors
Superheterodyne with seven transistors

CHAPTER VIII - RECEPTION OF SHORT WAVES - POWER SUPPLY OF RADIO RECEPTORS

Recharging the batteries
Mains power supply

CHAPTER IX - MEASURING AND CONTROL APPARATUS

Electric voltmeter
Millimeter sensitization
Modulated heterodyne
Audio frequency generator
Multivibrator
Transistor tester

CHAPTER X - WHAT CAN BE DONE WITH A DEFECTIVE TRANSISTOR?

He broke an end
Ars collector
Transistors with exaggerated fascia

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2 comments

  1. It was in the '80s when I wanted something like that. I even made a radio with a transistor, the diagram was on a magazine "Start to the future" And then on two transistors; And then a 5W amplifier with EFTs.

  2. The production of radio receivers with tubes in the west was drastically decreasing, but at least in France, stationary tube devices were produced until the 70s.

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