10 Free eBooks On Circuits

From understanding basic circuits to creating complex circuits, from analog to digital circuits, from designing circuits on PCs to circuits analysis, these free ebooks on electronics carries everything that you ever...

ECONOMICAL PUMP CONTROLLER

The automatic pump controller eliminates the need for any manual switching of pumps installed for the purpose of pumping water from a reservoir to an overhead tank (refer Fig.1). It automatically...

SIMPLE SOLDERING IRON TEMPERATURE REGULATOR

Soldering irons are available in different wattage and usually run at 230V AC mains. However, these have no temperature control. Low-voltage soldering irons (e.g., 12V) generally form part of a soldering...

VERSATILE CMOS/ TTL LOGIC AND CLOCK PROBE

For fault diagnosis of any logic circuit, you need a probe that can test the logic level or existence of clock activity. The circuit shown here can be used to test...

ELECTRONIC SCORING GAME

You can play this game alone or with your friends. The circuit comprises a timer IC, two decade counters and a display driver along with a 7-segment display.The game is simple....

TELEPHONE RECEIVER

This simple telephone receiver without a dialling section can be connected in parallel to a telephone line. It can be easily assembled on a small vero board or a PCB. A...

POWER-SUPPLY FAILURE ALARM

Most of the power-supply failure indicator circuits need a separate power-supply for themselves. But the alarm circuit presented here needs no additional supply source. It employs an electrolytic capacitor to store...

REMOTE-CONTROLLED POWER- OFF SWITCH

Remote controllers for various audio/ video systems are usually provided with a power ‘on’/‘off’ or standby-mode selector button. But turning the system off from the remote handset actually does not cut...

TELEPHONE LINE BASED AUDIO MUTING AND LIGHT-ON CIRCUIT

Very often when enjoying music or watching TV at high audio level, we may not be able to hear a telephone ring and thus miss an important incoming phone call. To...

LOW-COST PCO BILLING METER

The circuit presented here can be used in PCOs for displaying the actual bill. The comparative disadvantages of the presented circuit are as follows: 1. The calculator used along with this circuit...