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ABOUT TECHNOLOGY AND ELECTRONICS-DIY
125 Transistor Projects - Rufus Turner - What are "choke" filters?
Did you know that ...? In electronics, a "choke" is an inductor used to block high frequencies when passing direct current (DC) and low frequencies when passing alternating current (AC) in an electrical circuit? A "choke" usually consists of an insulated coil of wire often wound around a magnetic or ferrite core.
What does the book present?
Cele 125 circuits with a single transistor presented in this book are useful for amateur electronics and more. Only a few examples of cheap transistors are used in the book; however, all types are represented: germanium, silicon, NPN, PNP, junction and FET. The reader should be able to configure and test these circuits with minimal effort and equipment.
Circuit designs take into account the relatively wide spread of transistor values; the typical values of the manufacturers were used (or where only the maximum and minimum values were specified, the minimum value was used).
Thus, where there is a specified 30K resistor, a choice between standard 27K and 33K EIA values may be indicated and it may be necessary to try both values to determine which works best. However, in the case of frequency-determining RC networks, the exact values displayed must be used. Following these instructions, the reader should have little trouble duplicating or improving the desired performance.
These circuits are offered to the student who wants to configure and test typical circuits with their own instructions, to the designer who wants functional blocks ready to be incorporated in a system and to the hobbyist whose amateur interests will be served by preset, pre-tested circuits.
The structure of the book
CHAPTER I - AUDIO AMPLIFIERS
Germanium common - emitter amplifier Silicon common - emitter amplifier Degenerative common - emitter amplifier Transformer - coupled common - emitter amplifier FET Common - source amplifier Emitter follower (biased divider) Emitter follower (biased resistor) FET source follower Headphone amp Microphone handle preamplifier Driver for Class B stage Five-watt power amplifier Phase inverter Audio mixer Gated amplifier Tuned - transformer bandpass amplifier Inductor - capacitor - tuned bandpass amplifier Inductor - capacitor - tuned bandstop amplifier RC - tuned bandpass amplifier RC - tuned bandstop amplifier
CHAPTER II - RF, IF & DC AMPLIFIERS
Broadcast band RF amplifier (preselector) Conventional 455 kHz IF amplifier Single - tuned 455 kHz IF amplifier FET 455 kHz IF amplifier DC voltage amplifier DC current amplifier (low-level type) DC current amplifier (power type) Wideband (video) amplifier DC source follower DC emitter follower
CHAPTER III - OSCILLATORS
Transformer - tuned AF oscillator (PNP) Transformer - tuned AF oscillator (FET) Hartley - Type AF oscillator Phase - shift RC audio oscillator Light - operated AF oscillator Self-excited RF oscillator Conventional crystal oscillator Pierce crystal oscillator Multi-frequency crystal oscillator Self-excited 100 - kHz oscillator Crystal type 100 - kHz oscillator Power AF oscillator Beat frequency oscillator (BFO) Micropower AF oscillator Carrier - operated AF oscillator Pulse - generating oscillator Relaxation oscillator Multivibrator TV sound - channel marker oscillator Self-modulated RF oscillator
CHAPTER IV - CONTROL AND ALARM DEVICES
Sensitive DC relay (NPN) Sensitive DC relay (PNP) Sensitive DC relay (FET) Heavy-duty DC relay All-solid-state DC relay AC / RF relay Tuned AF relay Photoelectric Relay (solar cell type) Photoelectric relay (photofet type) Heavy-duty photoelectric control (all solid-state) Temperature - sensitive relay Touch-plate relay Relay coincidences Coincidence switch ("and" circuit) Inverter signal Heater control (manual adjust) Audible alarm Visual alarm (lamp flasher) Carrier - failure alarm interval timer Phase shifter
CHAPTER V - TEST INSTRUMENTS
DC microammeter (NPN) DC microammeter (PNP) Electronic DC voltmeter General-purpose field-strength meter TV field-strength meter Dip oscillator (PNP) Dip Oscillator (FET) Dip adapter AF frequency meter Audio signal injector Step - type audio oscillator Inductance / capacitance checker LC charts RF signal comparator Static detector (electrometer) Harmonic amplifier for frequency standards Electronic load resistor (PNP) Electronic load resistor (NPN) Heterodyne frequency meter AF signal-tracer adapter for VOM Phone monitor Monitor CW DC voltage calibrator electronic thermometer Sensitive absorption wavemeter AF wattmeter Tuned AF analyzer Metronome Bright-bulb stroboscope Sensitizer for DC milliammeter Circle generator for oscilloscope wheel patterns
CHAPTER VI - POWER SUPPLY APPLICATION
Variable DC power supply DC voltage regulator (shunt type) DC voltage regulator (series type) DC to DC inverter (low voltage) DC to DC inverter (medium voltage) DC to DC inverter (high voltage) DC supply for tunnel diodes Constant current adapter (low level) Constant current adapter (high level) Electronic filter "choke"
CHAPTER VII - RECEIVERS, TRANSMITTERS & ACCESSORIES
Simple broadcast receiver Diode receiver with transistor AF amplifier Step-tuned broadcast receiver Selective broadcast receiver Regenerative broadcast receiver All-wave regenerative receiver Autodyne converter Sun-powered broadcast receiver Meter-type tuning indicator Light-bulb type tuning indicator CW transmitter Frequency doubled Light beam receiver Oscillator practice codes
Excellent book for beginners. You omitted the word 'One' in the name. It resembles "One transistor, two transistors" from the Cristal Collection (Ed. Albatros), but much "richer" in montages, of course.
Yes, about the coil in the presentation, I found in the car radio, on the power supply, 2 meters of winding conductor of 0,5, put in two and wound on a ferrite bar, the question was why so, then I understood that it behaves as a blockage for alternative parasitic signals coming from the spark plug power supply.
Excellent book for beginners. You omitted the word 'One' in the name. It resembles "One transistor, two transistors" from the Cristal Collection (Ed. Albatros), but much "richer" in montages, of course.
The word 'One' was omitted for a clearer title. It really looks like "One transistor, two transistors" written by Ilie Mihaescu.
Yes, about the coil in the presentation, I found in the car radio, on the power supply, 2 meters of winding conductor of 0,5, put in two and wound on a ferrite bar, the question was why so, then I understood that it behaves as a blockage for alternative parasitic signals coming from the spark plug power supply.