Knowledge base

On this page, I give you informations about electronic components. I describe the components which I use in my projects …. and, if necessary, some basic knowledge about this.

Transistors

There are two types, NPN and PNP transistors. Each has one base (B), one collector (C) and one emitter (E).

NPN: C = plus pin, E = minus pin, B = plus pin
PNP:  C = minus pin, E = plus pin, B = minus pin

 npn                 pnp              npn-1
The third picture is typical, but please, look at the respective datasheet to get the correct pinout.

Examples:

BC 337-xx     NPN transistor
BC 549x         NPN transistor

BC327-xx      PNP transistor
BC557x           PNP transistor


ICs

BCD, 7 segment or similar …

74 HC 164     8 Bit Shift register
8 bit serial in, parallel out. For example to expand the numbers of arduino i/o ports, or to control an 7 segment display with only one data pin.

74 HC 595     8 Bit Shift register
Similar to 74HC164, only with additional latch pin.
8 bit serial in, parallel out. For example to expand the numbers of arduino i/o ports, or to control an 7 segment display with only one data pin.

SN74 LS 47N     BCD to 7-segment decoder/driver
With 4 data lines you control the 7 segment display.

74 HCT 4511     BCD to 7-segment latch/decoder/driver
With 4 data lines you control the 7 segment display.

74 HC 190E     BCD up/down counter

74 LS 42     BCD to decimal decoder

DC – DC converter, voltage or similart …

LT 1073     DC – DC converter, adjustable and fixed 5V, 12V

TSR 1-2433     DC – DC converter, 3.3V output, 1A
LM 1084 IT3.3     5A low dropout positive regulators, 3.3V

L 7805     positive voltage regulator, 5V output
Misc …

MCP 3008     8-Channel 10-Bit A/D Converters

UDN 2981     8 channel source driver

L293D     4 channel driver
With this driver IC you control a stepper engine or a relais. You control this IC with 5V (TTL logic level), the output level is maximum 36V (stepper engine).

74 LS 00     Quad 2-input NAND gate
74 LS 01     Quad 2-input NAND gate

74 LS 06     Hex inverted buffers with open collector outputs
74 LS 07     Hex buffers with open collector high voltage outputs

ICL 7107     3 1/2 digit LED display A/D converter


Sensors

KTY81     temperature sensor

DS18B20     temperature sensor, 1-wire digital thermometer

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