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To save space we have not provided lengthy explanations of how the circuits work. Or email Colin Mitchell: Photo of kit of components.

Each batch is slightly different: In many cases, a resistor or capacitor not in the kit, can be created by putting two filteype or capacitors in series or parallel or the next higher or lower value can be used. One is to go to school and study theory for 4 years and come out with all the theoretical knowledge in the world but almost no practical experience. We know this type of person. We employed them for a few weeks!

The other way is to build circuit after circuit and get things to work. You may not know filetypd in-depth theory of how it works but trial and error gets you there. We employed this type of person for up to 12 years. I am not bc3377 one is better than the other but most electronics enthusiasts are not “book worms” and anyone can cb337 in this field by constantly applying themselves with “constructing projects. It would flietype nothing for an enthusiast to build 30 – 40 circuits from our previous Transistor eBook and bc37 similar number from this book.

Many of the circuits are completely different to each other and all have a building block or two that you can learn from. Electronics enthusiasts have an uncanny understanding of how a circuit works and if you have this ability, don’t riletype it go to waste. Electronics bc373 provide you a comfortable living for the rest of your life and I mean this quite seriously. Once you get past this eBook of “Chips and Transistors” you will want to investigate microcontrollers and this is when your options will explode.

You will be able to carry out tasks you never thought possible, with a chip as small as 8 pins and a few hundred lines of code. As I say in fjletype speeches. What is the difference between a “transistor man” and a “programmer? In two weeks you can start to understand the programming code for a microcontroller and perform simple tasks such as flashing a LED and produce sounds and outputs via the press of a button. All these things are covered on Talking Electronics website and you don’t have to buy any books or publications.

Everything is available on the web and it is instantly accessible. That’s the beauty of the web. Don’t think things are greener on the other side of the fence, by buying a text book.

The only thing you have to do is build things. If you have any technical problem at all, simply email Colin Mitchell and any question will be answered.

Hundreds of readers have already emailed and after 5 or more emails, their circuit works.

VLF single-turn air core loop

That’s the way we work. One thing at a time and eventually the fault is found. If you think a circuit will work the first time it is turned on, you are fooling yourself. All circuits need corrections and improvements and that’s what makes a good electronics person. How do you think all the circuits in these eBooks were designed?


I don’t care if you use bread-board, copper strips, matrix board or solder the components in the air as a “bird’s nest. In filetupe the rougher you build something, the more you will guarantee it will work when built on a printed circuit board.

In most other cases, the layout is not critical.

These are classified as “universal” or “common” NPN and PNP types with a voltage rating of about 25v, mA collector current and a gain of about We simply use Philips types that everyone recognises. You can use almost any type of transistor to replace them and here is a list of the equivalents and pinouts: The filstype AC means Alternating Current but it really means Alternating Voltage as the rising and falling voltage produces an increasing and decreasing current.

The output of the following circuits will not be pure DC like that from a battery but will contain ripple. Ripple is reduced by adding a capacitor electrolytic to the output. But the ripple will be very high because only every alternate portion of the ac signal is being passed through the diode and the electrolytic called the filter capacitor cannot smooth the ripple very well.

The result will be a loud hum if powering an amplifier. An improvement is to use a bridge rectifier. This will reduce the ripple and reduce the hum because the waveform to the electrolytic consists of pulses that are closer together and the electrolytic does not have to supply as much energy because the pulses are closer together.

Fildtype zener diode is placed across the voltage you want to smooth and as the voltage increases, the zener diode turns ON more and additional current flows through it to the 0v rail. This reduces the voltage but the result fileytpe a smoother voltage. In place of a zener, we can use a transistor. It uses a zener to sense the voltage as in the zener regulator circuit above, but the current through the zener is less because the transistor turns ON and reduces the voltage.

A lower-wattage zener diode can be used and since less current flows through it, the voltage across it will be more stable. This arrangement is better than a zener diode regulator due the improved stability of the diode with less current flowing through it and the circuit will deliver about times more current due to the inclusion of the transistor. However, this circuit is very wasteful because the maximum current is flowing all the time and being sent to the 0v rail.

When you add a load such as an amplifier bc3377, the current is diverted from the shunt transistor and into the amplifier. The amplifier can only take current up to the maximum the transistor was passing to the 0v rail.

The circuit takes almost no current when the amplifier is not connected. The ripple on the output is determined by the effectiveness of the zener due to the low current is is required to pass and the transistor passes this voltage and amplifies the current about times.

No values have been provided for these circuits are they are intended to explain Shunt Transistor and Pass Transistor. The type of transistor and value of resistor in the power line will depend on the current. This means a 20mV ripple will be 0. This is important when you are powering an FM bug from a plug pack. The background hum is annoying and very difficult to remove with electrolytics.

This circuit is the answer. The 1k and u form a filter that makes the u one hundred times more effective than if placed directly on the supply-line. The transistor detects the voltage on the base and also detects the very small ripple.


As current is taken by the load, about th of this current is required by the base and if the load current is mA, the current into the base will be 1mA and one volt will be dropped across the 1k resistor. The circuit is suitable for up to mA. A power transistor can be used, but the 1k will have to be reduced to R for mA output. The output of the circuit is about 2v less than the output of the plug pack. By adding a zener across the electro, the output voltage will remain much more constant fixed.

This is the inability of the small transformer to provide a constant voltage. The addition of the 3 components only reduces the RIPPLE portion of the voltage – and does not change the fact that the voltage will droop when current is increased.

It requires a zener to fix this problem. This circuit can also be called: The u can be increased to u or 1,u. It can take the place of a 78L05 3-terminal regulator, but it is more efficient.

You can use any old cells and get the last of their energy.

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Use an 8-cell holder. The voltage from 8 old cells will be about 10v and the circuit will operate down to about 7. The regulation is very good at 10v, only dropping 10mV for up to mA output. This transistor simply allows the current to flow through the collector-emitter leads.

The output voltage is maintained by the 3-terminal regulator but the current flows through the “pass transistor. Normally a 2N or TIP is used for this application as it will handle up to 10 amps and creates a 10 amp power supply. The regulator can be 78L05 as all the current is delivered by the pass transistor. This has very limited application as many circuits do not like this. They supply power to a project for a short period of time.

The output voltage gradually dies and this will will produce weird effects with some projects. See circuit 4 in Time Delay Circuits below for a relay that remains active for a few seconds after the push button has been released.

They turn on a relay after a period of time. The aim of the circuit is to charge the electrolytic to a reasonably high voltage before the circuit turns Filety;e.

In fig 1 the voltage will be above 5v6. In fig 2 the voltage will be above 3v6. In fig 3 the voltage will be above 7v. The relay in this filetypf will remain filtype for a few seconds after the push button has been released. The value of the 1k resistor filety;e electrolytic can be adjusted to suit individual requirements.

Ordinary red LEDs do not work. When light is detected by the LED, its resistance decreases and a very small current flows into the base of the first transistor.

The k resistor on the collector is a current limiting resistor as the middle transistor only needs a very small current for the circuit to oscillate. If the current is too high, the circuit will “freeze.