150 Best Circuits
Independently published 2022
Over many years I have developed, built and tested countless circuits.
Many have fallen into oblivion, others have proven themselves again and
again in different situations. Especially my numerous projects with
Franzis, Elektor, Modul-Bus and Kosmos have left their mark. Often a
task made it necessary to brood long and intensively over quite small
problems. The result was often a circuit that I still like to use
today. These are my "150 best circuits".
Much of what has been collected here can also be found on the Internet
on my pages Elektronik-Labor.de, Elexs.de and B-Kainka.de. Often a
search is worthwhile here to learn more about the construction and the
use as well as further variants of a circuit. In the circuit collection
I will try to create a thematically structured summary, which often
also document the origin and the diverse use of a circuit.
The focus is on circuit technology with discrete semiconductors and
common standard ICs such as operational amplifiers and the NE555 timer.
The areas of radio technology and microcontrollers only appear on the
fringes, when simple amplifiers, sensors or switching stages are
included. Who counts exactly, finds here somewhat more than 150
circuits, because in some cases also the bases are clarified by circuit
diagrams. Which circuit exactly belongs to the "best" should be decided
by everyone anyway.
The book is not a complete reference book with established circuits,
but it is suitable for browsing and as a treasure trove for circuit
concepts and ideas. Even if only once in a while a circuit brings an
"aha" experience or solves a problem, it has already been worthwhile.
At least that is my experience. The eyes of the electronics engineer
are constantly roaming the world, always on the lookout for circuits
that solve a task even more simply or elegantly.
With this in mind, I wish all readers that they find what they are looking for.
1 Basic transistor circuits 1
2 Light sensors 4
3 Darlington circuit 7
4 Constant current sources and current mirrors 16
5 Integrator circuits 20
6 Differential amplifier 22
7 AF amplifier 26
8 Emitter follower and impedance converter 30
9 Push-pull stages 33
10 Flip flops 35
11 Multivibrators 37
12 Thyristors and TRIACs 45
13 Schmitt trigger 49
14 Tone generators 51
15 Phase shifter oscillators 54
16 LC oscillators 58
17 Audion receiver 68
18 Quartz oscillators 72
20 Ring oscillators 78
21 Relaxation oscillators 80
22 Operational amplifier 92
23 Signal amplifier with OPA 97
24 OPA oscillators 102
25 Measuring rectifier 104
26 Sine wave oscillator 105
27 Measuring amplifier 108
28 The NE555 timer 113
29 Basic power supply circuits 120
30 Voltage regulator 123
31 Voltage converters 127
32 Switching regulators 133