ICL7107 | Electronic Project Circuits

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ICL7107 – ICL7106 – DIGITAL VOLTMETER

This digital voltmeter is ideal to use for measuring the output voltage of your DC power supply. It includes a 3.5-digit LED display with a negative voltage indicator. It measures DC voltages from 0 to 199.9V with a resolution of 0.1V. The voltmeter is based on single ICL7107 chip and may be fitted on a small 3cm x 7cm printed circuit board. The circuit should be supplied with a 5V voltage supply and consumes only around 25mA.

Brightness of the LED display segments can be varied by adding or removing 1N4148 small signal diodes that are connected in series. Use two 1N4148 diodes for higher LED display brightness.

The use of 7805 5V voltage regulator is highly recommended to prevent the damage of ICL7107, 7660 ICs and to extend the operating voltages.

220 Ohm resistor should be connected to the PIN 4 on the first LED display.

The voltmeter can also be configured to measure different voltage ranges and display higher voltage resolution. Replacing 1M with 100K resistor will allow to measure 0 – 19.99V voltages with 0.01V (10mV) accuracy.

Source: http://electronics-diy.com/ICL7107_volt_meter.php … Thank you.

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Categories: Digital, Meter Tags: digital voltmeter, ICL7106, ICL7107

ICL7107 based, 4 channel digital thermometer

7107 is a old, good and versatile AD converter. I’m absolutely sure that 7106-7107 family will be in use since 2005 or maybe more… ( in Romania of course )
This four channel digital thermometer was designed for use in a car who hasn’t board processor ( like our national car: Dacia 3xxx ). The thermometer can measure inside and outside temperature, water for motor cooling or ( why not ? ) driver’s temperature… The thermometer section is here:

Source:http://www.geocities.com/vsurducan/electro/4TEMP/4temp.htm